Framework Release

NUnit 4.4.0 - May 28, 2025

This release contains bug fixes and smaller enhancements, with 20 issues fixed.

Enhancements

4975 Support ignoring line ending format when comparing strings. Thanks to Jihoon Park for PR 4976
4968 Asserts with UsingPropertiesComparer and Tolerance crashes unxpectedly if using TimeSpan and the class contains Properties with different types. Thanks to NUnit Team member Manfred Brands for PR 4972
4945 Integer Assert.That(i, Is.Even);/Assert.That(i, Is.Odd); and Assert.That(i, Is.MultipleOf(step));. Thanks to NUnit Team member Manfred Brands for PR 4946
4935 [Feature Request] PropertiesComparer for different types. Thanks to NUnit Team member Manfred Brands for PR 4925
4909 Assertion failures with PropertiesComparer are hard to debug when combined with other modifiers. Thanks to NUnit Team member Manfred Brands for PR 4922
4687 Value equality on subset of object properties. Thanks to NUnit Team member Manfred Brands for PR 4925
4244 [Feature request] EquivalentTo that compares similar objects of different types. Thanks to NUnit Team member Manfred Brands for PR 4925

Bug fixes

4981 ContainsKey doesn't support IgnoreCase, IgnoreWhiteSpace, or IgnoreLineEndingFormat. Thanks to NUnit Team member Manfred Brands for PR 4989
4964 Is.Not.EqualTo does not work correctly with Using comparer. Thanks to NUnit Team member Manfred Brands for PR 4965
4954 Regression in Is.EqualTo(DateTime) constraint in 4.3.x for types that implement IEquatable<DateTime>. Thanks to NUnit Team member Manfred Brands for PR 4957
4937 PartitionFilter.ComputeHasValue throws exception when test name is greater than 4096 characters. Thanks to Will Ray for PR 4941
4933 Dictionary assertion falsely passes with PropertiesComparer when subtypes are involved. Thanks to Oleksandr Liakhevych for PR 4934
4919 Assert.ThatAsync doesn't work correctly if calling nested Asserts. Thanks to NUnit Team member Manfred Brands for PR 4922
4917 Multiple unannounced breaking changes in minor version. Thanks to NUnit Team member Manfred Brands for PR 4927
4916 Is.EqualTo(double).Using(EqualityComparer<double>) causes overload ambiguity error. Thanks to NUnit Team member Manfred Brands for PR 4951
4545 DelegatingConstraintResult does not use its _innerResult for WriteMessageTo . Thanks to NUnit Team member Manfred Brands for PR 4922
4537 AssertException in TearDown hides Exception in Test. Thanks to NUnit Team member Manfred Brands for PR 4979
2841 DelayedConstraint calls delegate twice. Thanks to NUnit Team member Manfred Brands for PR 4929

Refactorings

4930 What to do with IConstraint.Apply<TActual>(ref TActual). Thanks to NUnit Team member Manfred Brands for PR 4944

Others

4906 Test error in TestContextOneTimeTearDownTests. Thanks to NUnit Team member Steven Weerdenburg for PR 4928

The following issues are marked as breaking changes

4930 What to do with IConstraint.Apply<TActual>(ref TActual). Thanks to NUnit Team member Manfred Brands for PR 4944

This only applies to other implementers of extensions. See issue and PR for more information.

Acknowledgements

We want to express our heartfelt gratitude to everyone who has contributed to this release by reporting bugs, suggesting enhancements, and providing valuable feedback. Your efforts help make NUnit better for the entire community.

A special thank you to the following reporters for identifying issues:

Artur Kharin	Christophe Chevalier	Christophe PLAT	Dan Vicarel
Edgaras	Grégoire	Igor Vyatkin	Jihoon Park
Johan Appelgren	Julien Nigay	Jörg Staub	maettu-this
Manfred Brands	Oleksandr Liakhevych	Sputnik24	Terje Sandstrom
Will Ray

and to the commenters who engaged in discussions and offered further insights:

Anders Gustafsson	Andrew Gray	CharliePoole	Christoph
Christophe PLAT	Dan Vicarel	David Schruf	Edgaras
ethan	Gr‚goire	Igor Vyatkin	Johan Appelgren
Joseph Musser	Julien Nigay	Jrg Staub	maettu-this
Manfred Brands	Mikkel Nylander Bundgaard	Oleksandr Liakhevych	pembebiri
Sean Killeen	Sputnik24	Star62enis	Steven Weerdenburg
Terje Sandstrom	Vito Videtta	Will Ray

NUnit 4.3.2 - Dec 28, 2024

This is a hotfix release for a regression bug, and also fixes the version numbers of the assembly DLLs.

There are 2 issues fixed in this release.

Bug fixes

4910 Versioning for .NET Framework 4.6.2 version of NUnit v4.3.1 inconsistent in .csproj file.
4907 Assert.ThatAsync fail to catch expected exception. Thanks to NUnit Team member Manfred Brands for PR 4908

Acknowledgements

A special thank you to the following reporters for identifying issues:

Brian

shlomi-borovitz-greenroad

and to the commenters who engaged in discussions and offered further insights:

Manfred Brands	Oleksandr Liakhevych	shlomi-borovitz-greenroad	Steven Weerdenburg
Terje Sandstrom

NUnit 4.3.1 - Dec 21. 2024

This is a hotfix release to address a type safety issue that broke when some classes had implicit conversion operators.

We had 3 bugs reported, they are all fixed by the same Pull Request.

In addition, a small internal build issue was fixed.

Bug fixes

4903 Strange null reference after updating to v4.3.0. Thanks to NUnit Team member Manfred Brands for PR 4899
4902 Regression in 4.3.0 comparing class that override equals and implicit string conversion. Thanks to NUnit Team member Manfred Brands for PR 4899
4898 Assert(..., Is.EqualTo(...)) issues since 4.3.0. Thanks to NUnit Team member Manfred Brands for PR 4899

Internal fixes

4806 Benchmarks fail to run. Thanks to NUnit Team member Steven Weerdenburg for PR 4897

Acknowledgements

A special thank you to the following reporters for identifying issues:

and to the commenters who engaged in discussions and offered further insights:

NUnit 4.3.0 - Dec 15. 2024

This release includes a series of enhancements and bug fixes. Notably, some of the bug fixes address issues related to a lack of type safety in NUnit. See issues 4877, 4876, 4875, 4874 and 150.

Be aware that this might cause compile errors in cases where the code was previously ignored. These errors can be safely resolved by removing the affected code.

There are 29 issues fixed in this release.

Enhancements

4890 Add .net 8 as a target framework in the package. Thanks to NUnit Team member Manfred Brands for PR 4884
4886 Optimize ToArray()[0] with First() in TestAssert class in TestAssert.cs. Thanks to Saurav-shres for PR 4888
4862 PropertiesComparer 32 Property Limit Error Message. Thanks to Cincidial for PR 4870
4861 Always repeat Test x times. Thanks to Christoph for PR 4864
4852 Expand the usability of Contains.Key(...).WithValue(...). Thanks to Michael Render for PR 4854
4846 Add NET9 target for the framework tests. Thanks to Leon Lux for PR 4851
4839 Allow to use collection expressions with collection constraints. Thanks to Oleksandr Liakhevych for PR 4840
4832 Setting thread names to make debugging easier. Thanks to NUnit Team member Terje Sandstrom for PR 4835
4811 Assert.ThatAsync does not support polling. Thanks to Oleksandr Liakhevych for PR 4813
4771 Support tuples in inline data. Thanks to MaxKot for PR 4772
2492 EqualConstraint.Using(StringComparer.*) causes overload ambiguity error. Thanks to NUnit Team member Manfred Brands for PR 4882

Bug fixes

4887 FileLoadException for NUnit 4.2.2 when upgrade the System.Buffers to 4.6.0. Thanks to NUnit Team member Terje Sandstrom for PR 4891
4877 Fix EqualTo modifiers for DateTime. Thanks to NUnit Team member Manfred Brands for PR 4882
4876 Equal.Within Fails With Negative Tolerance. Thanks to Raffael Botschen for PR 4881
4875 String constraints should not allow using Within. Thanks to NUnit Team member Manfred Brands for PR 4882
4874 IgnoreCase, Seconds and Minutes can be used on numerical constraints. Thanks to NUnit Team member Manfred Brands for PR 4882
4868 TestCase- and TestCaseSourceAttribute cannot handle generic test methods where method parameter is Nullable<T>. Thanks to NUnit Team member Manfred Brands for PR 4872
4836 PropertiesComparer doesn't work well with records. Thanks to Oleksandr Liakhevych for PR 4837
4807 Is.EqualTo with empty ValueTuple throws System.NotSupportedException "Specified Tolerance not supported for instances of type 'System.ValueTuple' and 'System.ValueTuple'" after updating to NUnit 4.2.2. Thanks to NUnit Team member Manfred Brands for PR 4809
4281 Throws and Delayed (.After) Constraints do not cooperate, resulting in incorrectly failing test. Thanks to Oleksandr Liakhevych for PR 4815
4110 Support running single-threaded async tests on Linux. Thanks to NUnit Team member Manfred Brands for PR 4883
3772 IsEquivalent on default ImmutableArray throws exception. Thanks to Sergio L. for PR 4850
3713 Description of --where=EXPRESSION missing from Notes section. Thanks to rsjackson3 for PR 4817
150 Improve inference of type arguments in generic test methods. Thanks to NUnit Team member Steven Weerdenburg for PR 4873

Refactorings

None

Internal fixes

4865 Increase Legacy NUnit so at least all methods are covered. Thanks to NUnit Team member Manfred Brands for PR 4871
4841 MacOS test failure. Thanks to NUnit Team member Manfred Brands for PR 4842
4819 Remove StringUtil.Compare() and update references in the tests. Thanks to Sergio L. for PR 4827
4798 Add a test to ensure direct framework dependencies in csproj are reflected in nuspec. Thanks to NUnit Team member Terje Sandstrom for PR 4799

Deprecated features

None

Others

The following issues are marked as breaking changes

None

Acknowledgements

First and foremost, we want to recognize the exceptional contributions of team members Manfred Brands and Steven Weerdenburg for their dedicated efforts on this release, particularly their work on improving type safety.

We also express our heartfelt gratitude to everyone who has contributed to this release by reporting bugs, suggesting enhancements, and providing valuable feedback. Your efforts help make NUnit better for the entire community.

A special thank you to the following reporters for identifying issues:

Christoph	Christophe Chevalier	Cincidial	Joseph Musser
Leon Lux	Manfred Brands	MaxKot	MCMrARM
Michael Render	Michaela Maura Elschner	mzh3511	Oleksandr Liakhevych
Raffael Botschen	Sander	Saurav-shres	seesharks
Steven Weerdenburg	Terje Sandstrom	Wim van Gool

and to the commenters who engaged in discussions and offered further insights:

CharliePoole	Chris Maddock	Christoph	Christophe Chevalier
Cincidial	Harsh Jain	Joseph Musser	Leon Lux
Manfred Brands	MaxKot	Michael Render	Michaela Maura Elschner
Mikkel Nylander Bundgaard	Oleksandr Liakhevych	PicNet	Raffael Botschen
Rob Prouse	rsjackson3	Sascha Bartl	Saurav-shres
Sergio L.	Steven Weerdenburg	Terje Sandstrom	Wim van Gool

NUnit 4.2.2 - August 31. 2024

This hotfix addresses an issue with asynchronous behavior introduced in version 4.2.0. It resolves a regression bug that affected the release.

4802 System.NotSupportedException when using AsyncEnumerable test cases for TestCaseSourceAttribute. Fixed by PR 4804

NUnit 4.2.1 - August 23. 2024

This is a hotfix release for 4.2.0, fixing issues related to .NET Framework.

Bug fixes

4795 NUnit 4.2.0 is missing System.Buffers on .NET Framework.
4794 EqualConstraint fails with missing assembly references on .NET Framework since NUnit 4.2.

NUnit 4.2 - August 22. 2024

There are 37 issues fixed in this release.

Enhancements

4777 Publicly expose IgnoreAttribute.Reason. Thanks to Michael Render for PR 4781
4738 QoL suggestion: fail fast in Assert.Multiple under debugger. Thanks to MaceWindu for PR 4749
4710 Improve PropertiesComparer diagnostics. Fixed by team PR 4712
4686 Provide a ProgressTraceListener to redirect Trace output to the NUnit Progress output. Thanks to maettu-this for PR 4709
4632 Generic TestCase and TestCaseParameter support. Fixed by team PR 4755
4353 TestContext.AddTestAttachment with long file paths. Thanks to Rohit Aggarwal for PR 4665
4134 NUnit 3 console does not display logs from background thread from a library. Thanks to maettu-this for PR 4709
3918 String comparison without whitespace. Fixed by team PR 4664
3829 Consider optimizing StreamsComparer for happy path. Thanks to Mithilesh Zavar for PR 4668
3767 Incorrect number of items listed in failure message. Thanks to Dmitrij for PR 4702
1396 Class Level Category Missing from TestContext. Fixed by team PR 4757
796 TestContext.CurrentContext.Test.Properties from TestFixture should be available from TestContext for Test. Fixed by team PR 4757
548 Properties set on a parameterized method are not accessible to TestContext. Fixed by team PR 4757
4587 Feature request: Assert.Multiple() could return an IDisposable, avoiding passing an Action around.. Fixed by team PR 4758

Bug fixes

4782 Bug report: [ValueSource] doesn't play nice with [CancelAfter]. Fixed by team PR 4783
4770 Bug report: [Values] doesn't play nice with [CancelAfter]. Fixed by team PR 4774
4750 DefaultFloatingPointTolerance ignored for TestCaseData. Fixed by team PR 4754
4723 CurrentContext.Result.Outcome.Status is inconclusive in TearDown if Timeout attribute is used in 4.x. Fixed by team PR 4727
4705 The dll's in the release 4.1 has version 4.0.1. Fixed by team PR 4706
4670 .ContainKey().WithValue() and .Or/.And interact incorrectly. Fixed by team PR 4672
4659 TestCaseSource that contains Exception with InnerException - not running tests. Fixed by team PR 4663
4651 After upgrade from version 3.14.0 to 4.* running multiple test categories in parentheses separated with 'OR' stopped working. Fixed by team PR 4760
4639 ValueTask is not being properly consumed by the AwaitAdapter. Fixed by team PR 4640
4598 DefaultTimeout in .runsettings + TearDown method seems to break test output. Fixed by team PR 4692
4589 Exception when using test filters from .runsettings or --filter argument from dotnet test. Fixed by team PR 4760
4584 Nunit 4.0.x Test case selection is incorrect with certain test data. Fixed by team PR 4773
1358 TestContext.CurrentContext.Test.Properties does not contain value(s) from PropertyAttribute when using TestCaseAttribute. Fixed by team PR 4757

Refactorings

4577 Remove some version hard-coding in the OSPlatformTranslator. Fixed by team PR 4756

Internal fixes

4735 StreamComparer - Pool allocating the byte array reduces memory allocation by 96%. Thanks to Mithilesh Zavar for PR 4737
4733 Improve speed of Randomizer.GetString. Fixed by team PR 4512
3981 Switch default branch to main. Fixed by team PR 4753
4649 Switch to using MacOS 14 in GitHub Actions. Fixed by team PR 4648
3757 Re-Add WinForms and WPF based tests. Fixed by team PR 4776

Deprecated features

None

Others

4765 Document ThrowOnEachFailurUnderDebugger.
4730 Remove reference to the mailing list from CONTRIBUTING.md. Fixed by team PR 4752
4726 Using<TCollectionType, TMemberType> is unclear. Thanks to Michael Render for PR 4729
4684 Increment StreamsComparer by 'Actual bytes read' rather than the buffer size. Fixed by team PR 4671

The following issues are marked as breaking changes

None

NUnit 4.1 - February 23. 2024

This release is a bugfix and smaller enhancement release.

There are 8 issues fixed in this release.

Enhancements

4600 Add DateTime/TimeSpan support for inequality tolerance. Thanks to Michael Render for PR 4618
4572 Make new PropertiesComparer optional. Fixed by team PR 4608 Adding modifier UsingPropertiesComparer() to AnyOf-, Equal-, SomeItems-, CollectionEquivalent-, CollectionSubset-, CollectionSuperSet-, DictionaryContainsKey-, DictionaryContainsKeyValuePair-, DictionaryContainsValue- and UniqueItemsConstraint.
1215 Explicit specification of generic method types on TestCase and TestCaseSource. Fixed by team PR 4620 See TestCase and TestCaseSource documentation.

Bug fixes

4602 WpfMessagePumpStrategy - change from Dispatcher.Run to Dispatcher.PushFrame . Thanks to soerendd for PR 4603
4591 Parameter count mismatch with indexer. Fixed by team PR 4608
4581 NUnit 4 needs System.Threading.Tasks.Extensions for net472 tests. Fixed by team PR 4582

Refactorings

4626 Remove link in readme to the google discuss group, it's spammed.. Fixed by team PR 4627

Internal fixes

4606 GitHub Actions fail on master for Windows and Linux builds. Fixed by team PR 4607

Deprecated features

None

The following issues are marked as breaking changes

None.

Be aware that in version 4.0 the different equality constraints included checking properties of objects. That was a breaking change from earlier versions, and has now been replaced with an UsingPropertiesComparer() modifier, making this optional.

NUnit 4.0.1 - December 2. 2023

This is a hotfix release for three issues related to targeting windows targets, like net6.0-windows. If you don't use these targets, you can safely ignore this release.

For more details, see the information in the issues below:

Bug fixes

4571 NUnit 4: dotnet test behaving differently locally vs on GH Actions (failing). Fixed by team PR 4574
4565 Unable to test project targeting net8.0-windows and win-x64 . Fixed by team PR 4569
4564 Tests not discovered for .NET Windows-specific TFM without Windows build number. Fixed by team PR 4569

NUnit 4.0.0 - November 26. 2023

This release is an incremental improvement of version 3, and can be used with the same runners as before, although a minor upgrade might be needed for some.

For the NUnit3TestAdapter, you will need version 4.5 to run tests with NUnit 4.

If you use the NUnit Console, you will need version 3.15.3 or later (but not any 3.16.X versions)).

The minimum target framework supported is now dotnet framework 4.6.2, and .net 6.0.

See the planning notes for more information about the changes.

See the migration guide for how to move your projects from NUnit 3 to NUnit 4.

Credits

All issues marked "Fixed by team" has been done by the members of the framework team.

Issues marked "Thanks to" has been done by external contributors. We appreciate all the work all these people have been doing!

There are 112 issues fixed in this release.

Enhancements

4551 Make ConstraintExpression.AnyOf() accept IEnumerable. Thanks to Ivan Gurin for PR 4552
4521 Proposal: Async test case sources . Fixed by team PR 4389
4489 Use buffer pooling when calculating partition filters. Fixed by team PR 4500
4476 Add support to StreamsComparer for non-seek able streams. Thanks to Michael Render for PR 4483
4433 Add string syntax attributes (.NET 7+). Thanks to Michael Render for PR 4425
4431 Improving error message handling and performing assert consolidation. Fixed by team PR 4430
4421 Add support for native .NET-6.0 target . Fixed by team PR 4431
4413 Assert.That methods should autogenerate message, if null. Fixed by team PR 4419
4394 Expand NUnitEquality to use Equality of all Properties. Fixed by team PR 4436
4391 Hash/Partition based Test Filter. Thanks to Andrew Armstrong for PR 4392
4385 Add support for Test Cancellation. Fixed by team PR 4386
4355 Allow Is.AnyOf to be called with arrays or other collections. Fixed by team PR 4356
4149 Distribute optimized framework builds with easy debugging. Thanks to Marko Lahma for PR 4350
4144 Stderr/Console.Error will hold back Unicode escaped log messages. Thanks to Max Schmitt for PR 4145
4101 Expose ExpectedResult to the TestContext. Fixed by team PR 4239
4086 Perform case-insensitive string comparisons in-place. Fixed by team PR 4088
4053 Cache method discovery by migrating PR 4034 to main. Fixed by team PR 4208
3984 Add net6.0 targets. Fixed by team PR 3988
3941 PlatformAttribute has AllowMultiple = true, but that doesn't work. Fixed by team PR 3926
3936 Is there any way we could make use of CallerArgumentExpressionAttribute?. Fixed by team PR 4419
3899 Allow randomizing 'Guid' test arguments with [Random]. Thanks to Arnaud TAMAILLON for PR 3951
3866 SupportedOSPlatform. Fixed by team PR 3926
3856 Theories in nested Testfixtures. Thanks to Felix Kr”ner for PR 3857
3718 Improve readability of "assert failed" message for DictionaryContainsKeyValuePairConstraint WithValue(). Fixed by team PR 3778
3457 Add DefaultConstraint. Thanks to Oleksandr Liakhevych for PR 3781
3432 Assert.That is blocking and might lead to deadlock when used with WCF.. Thanks to Gavin Lambert for PR 4322
3391 TestCaseSource to recognize new async streams. Fixed by team PR 4538
3376 Nullable Reference Types annotations. Fixed by team through multiple PRs. . Fixed by team PR 3488
3043 Add AsyncEnumerable support for TestCaseSource, ValueSource, and TestFixtureSource. Fixed by team PR 4538
2843 Replacing ThrowsAsync with a composable async alternative. Thanks to Gavin Lambert for PR 4322
1459 Support for params keyword in parameterized test fixtures. Thanks to Leo Shine for PR 4478
4391 Hash/Partition based Test Filter. Thanks to Andrew Armstrong for PR 4392
3936 Is there any way we could make use of CallerArgumentExpressionAttribute?. Fixed by team PR 4419
3798 Support abstract methods marked as tests. Fixed by team PR 4490

Bug fixes

4554 SetUpFixture has stopped working going from NUnit 3.13.3 to 3.14.0/4.0.0-beta.1. Fixed by team PR 4555
4532 Assert.That no longer allows 'null' message. Fixed by team PR 4533
4529 Forwardport: Missing stack trace when exception occurs during OneTimeSetUp #2466. Fixed by team PR 4469
4528 Forwardport: Is.SupersetOf and Is.SubsetOf no longer work with ImmmutableDictionary<TKey,TValue> in NUnit 3.13.3 #4095. Fixed by team PR 4098
4522 Missing stack trace when exception occurs during OneTimeSetUp #2466. Fixed by team PR 4469
4491 NUnit 4.0 fails when [Repeat] is present and test passes. Fixed by team PR 4517
4484 String not-regex constraint succeeds non-string actual value. Thanks to Michael Render for PR 4492
4450 Missing comparison failure details for EqualTo when comparing two collection. Thanks to Ashish Dawale for PR 4502
4423 Chaining multiple collection asserts with index. Thanks to Daniel Waechtler for PR 4480
4400 Within throws ArgumentException if null value is involved. Thanks to Ashish Dawale for PR 4482
4319 TextRunner accidentally disposes System.Out. Thanks to Norm Johanson for PR 4317
4308 Random attribute with Distinct and wide range causes test to disappear. Thanks to Russell Smith for PR 4316
4264 Assert.Multiple method should fail only if a contained assertion failed. Thanks to Samuel Delarosbil for PR 4313
4259 Bug: Assert.That(IEnumerable<Type>, Has.All.Property(nameof(Type.Namespace)) fails.. Fixed by team PR 4260
4255 InternalTrace.Initialize fails with Nullref exception. Fixed by team PR 4256
4246 Stack overflow when running tests on machine with Thai regional format. Fixed by team PR 4345
4243 Type args are not deduced correctly for parameterized fixtures. Thanks to Samuel Delarosbil for PR 4307
4237 Bogus check for Windows 11. Fixed by team PR 4374
4158 SetupFixture should have an AttributeUsage of Inherited = false. Thanks to TillW for PR 4222
4107 Incorrect type specified for Values attribute fails unrelated tests. Fixed by team PR 4133
4096 NUnit.Framework 3.13.2 introduced a breaking change that conceals problems with tests. Fixed by team PR 4133
3964 DictionaryContainsKeyValuePairConstraint doesn't work with IDictionary<TKey, TValue>. Thanks to Louis Zanella for PR 4014
3961 OneTimeTearDown runs on a new thread with mismatched Thread Name and Worker Id. Thanks to EraserKing for PR 4004
3953 Dispose is not called on test fixtures with LifeCycle.InstancePerTestCase without TearDown method. Fixed by team PR 3963
3872 Add support for ref bool, ref bool?, in bool, and in bool? when using NUnit.Framework.ValuesAttribute. Thanks to Samuel Delarosbil for PR 4304
3868 Order attribute skips classes with multiple test fixtures. Thanks to Samuel Delarosbil for PR 4304
3867 nunit Framework tests do not run with "dotnet test" nor inside VS2019 (Windows). Fixed by team PR 4315
3858 Running tests with ITestAction attributes leaks memory. Thanks to Marko Lahma for PR 4300
3811 Incorrect summary comments on Warn.If overloads. Fixed by team PR 3845
3735 Parallelizable TestFixtureSource with TestFixtureData not running in parallel. Thanks to Julien Richard for PR 4099
3449 Assert.AreEqual overloads for nullable double are not useful. Thanks to Anton Ashmarin for PR 3780
3274 Overridden tests are not discovered in NUnit 3.12.0. Fixed by team PR 4490
3215 Better error message for generic test where type parameter cannot be determined. Thanks to Ove Bastiansen for PR 4382
2870 CollectionTally (EquivalentTo) should throw for non-transitive comparisons. Thanks to Russell Smith for PR 4312
2841 DelayedConstraint calls delegate twice. Fixed by team PR 4488
2835 Control character encoding is inconsistent between TestCase[Source] and TestFixture[Source]. Fixed by team PR 4498
2436 Properties on System.Type cannot be used with either property constraint. Fixed by team PR 4259
1428 NUnitLite package always installs both Program.cs and Program.vb. Fixed by team PR 3952

Refactorings

4539 Upgrade to latest analyzers package and fix the warnings.
4434 Fixing the classic asserts. Fixed by team PR 4438
4416 Move classic asserts into its own project . Fixed by team PR 4417
4380 Consistently use _ prefix for field names. Fixed by team PR 4387
4378 Update code base to use 'is (not) null' consistently. Fixed by team PR 4379
4376 Update code base to explicitly specify accessibility. Fixed by team PR 4377
4364 Add NUnit.Analyzer to our test projects. Fixed by team PR 4366
4111 Is.Empty constraint on complex collections might hide bugs. Thanks to Felix Kr”ner for PR 4120
4051 Update codebase to use Array.Empty<T>. Thanks to Marcin Jedrzejek for PR 4127
3932 Make Numerics class internal. Thanks to TillW for PR 4205

Internal fixes

4503 Add NET8 target for the framework tests. Thanks to Ashish Dawale for PR 4511
4432 Fix null message in internal static string? ExtendedMessage(string methodName, string? message, string actualExpression, string constraintExpression). Fixed by team PR 4430
4331 Add testing to "Accumulate further failures if any on AssertMultiple instead of throwing". Thanks to Samuel Delarosbil for PR 4313
4212 Add Windows11 support to the Platform attribute. Fixed by team PR 4213
4170 Add .NET7 as a build target for the test suite . Fixed by team PR 4224
4078 THREAD_ABORT not properly set. Fixed by team PR 4079
4075 Remove unnecessary allocations in NUnitEqualityComparer. Fixed by team PR 4076
4072 Use pattern matching in Constraints to avoid unnecessary casts. Fixed by team PR 4073
4065 Use pattern matching in the comparers. Fixed by team PR 4066
4055 Use static Regex.IsMatch in ValueMatchFilter to take advantage of caching. Fixed by team PR 4056
4049 Simplify property retrieval in DefaultTestAssemblyBuilder.Build(). Thanks to Scott Buchanan for PR 4054
3935 Numerics.IsFixedPointNumeric should return false for decimals. Thanks to Wellington Balbo for PR 3942
3789 Change copyright header on files. Fixed by team PR 3795
3764 Switch to the dotnet tool version of Cake. Fixed by team PR 3835
3588 Audit string equality comparisons and consider changes for v4. Fixed by team PR 3770
2485 Remove\Trim copyright on individual files. Fixed by team PR 3795
4504 Remove appveyor build. Fixed by team PR 4509
4465 Update cake version in build scripts. Fixed by team PR 4540
4036 Drop net45 build target in nunit4. Fixed by team PR 4050
3984 Add net6.0 targets. Fixed by team PR 3988
3980 Drop netcoreapp2.1 targets. Fixed by team PR 3988
3812 Add GitHub Actions. Fixed by team PR 3819
3764 Switch to the dotnet tool version of Cake. Fixed by team PR 3835
3758 Drop .NET 3.5 Build Targets. Fixed by team PR 3760
2485 Remove\Trim copyright on individual files. Fixed by team PR 3795

Deprecated features

4415 Remove use of params for messages. Fixed by team PR 4419
4036 Drop net45 build target in nunit4. Fixed by team PR 4050
3980 Drop netcoreapp2.1 targets. Fixed by team PR 3988
3769 Remove code marked "Obsolete". Fixed by team PR 3836
3758 Drop .NET 3.5 Build Targets. Fixed by team PR 3760
3708 Drop .NET 4.0 Build Target. Fixed by team PR 3760
3410 Consider deprecating NUnitEqualityComparer.AreEqual optional bool parameter. Thanks to TillW for PR 3960
3132 Remove AssertionHelper and AssertionHelperTests. Fixed by team PR 3836

Others

3869 Copyright notices for third-party code. Thanks to Lennart Brggemann for PR 4444
3301 [HandleProcessCorruptedStateExceptions] has no effect unless we disable partial trust. Fixed by team PR 4398

The following issues are marked as breaking changes

4416 Move classic asserts into its own project . Fixed by team PR 4417
4415 Remove use of params for messages. Fixed by team PR 4419

Also note that there are some breaking changes in the API for NUnit.

Ref Issue 4610.

Constraint.Description: It is now an abstract get property, earlier a virtual with protected setter.
PrefixConstraint.DescriptionPrefix: It is now an abstract get property, earlier a virtual with protected setter.

NUnit 3.14.0 - November 4, 2023

Total number of issues fixed in this release is : 16

Enhancements

4046 Backport .NET6 test infra + build improvements from #3984 onto v3.13 branch. Fixed by team PR 4077 ( backport of issue 3984)
4009 Performance degradation on many tests. Thanks to Marko Lahma for PR 4034
3859 Proper test result exception message when hitting TimeoutAttribute. Fixed by team PR 4118
3601 Nunit 3.10.1.0 + ReSharper 2020.1.4: Test execution delayed by ~60seconds . Thanks to Marko Lahma for PR 4034
2729 Proposal: Async test case sources. Fixed by team PR 4390

Bug fixes

4527 Backport: NUnit.Framework 3.13.2 introduced a breaking change that conceals problems with tests. Fixed by team PR 4104 ( backport of issue 4096 by pr 4133)
4525 Backport: SetupFixture should have an AttributeUsage of Inherited = false . Thanks to TillW for PR 4223 ( backport of issue 4158 by pr 4222)
4523 Backport: Stack overflow when running tests on machine with Thai regional format. Fixed by team PR 4346 ( backport of issue 4246 by pr 4345)
4324 Backport to v3: TextRunner accidentally disposes System.Out. Thanks to Norm Johanson for PR 4325 ( backport of issue 4319 by pr 4317)
4095 Is.SupersetOf and Is.SubsetOf no longer work with IImmmutableDictionary<TKey,TValue> in NUnit 3.13.3. Fixed by team PR 4097
3859 Proper test result exception message when hitting TimeoutAttribute. Fixed by team PR 4118
3710 Calling NUnitLite from LINQpad, can't parse assembly path. Thanks to Norm Johanson for PR 4325
2466 Missing stack trace when exception occurs during OneTimeSetUp. Fixed by team PR 4467

Refactorings

None

Internal fixes

4524 Backport: Add .NET7 as a build target for the test suite #4170. Fixed by team PR 4302 ( backport of issue 4170 by pr 4224)
4293 .NET5 Test Suite is failing on Azure DevOps for Windows. Fixed by team PR 4296
2973 Write up recommended way to test and link it from the readme. Thanks to Bruno Juchli for PR 2971

Deprecated features

None

The following issues are marked as breaking changes

None

NUnit 3.13.3 - March 20, 2022

This release includes several performance enhancements. @lahma provided a massive speed improvement for large, parametrized test suites. In addition, equivalency tests with large unsortable collections run faster by determining if the collections are sortable before attempting to sort them.

We've added several fixes for .NET 6.0 and we've stopped testing NUnit against .NET Core 2.1 which is now out of support.

There are also several fixes for the new FixtureLifeCycle feature and other smaller bug fixes and performance improvements.

Issues Resolved

2963 Flakey tests in FrameworkControllerTests
3643 Assert.Pass(message) produces "reason" in XML-Result
3841 Breaking change: Is.SupersetOf with ValueTuple requires IComparable in NUnit 3.13.2
3843 IDisposable & InstancePerTestCase: Object created for OneTimeSetUp is not disposed
3898 NUnit 3.13.2 : LessThanOrEqualTo fails on a case which should succeed
3903 Backport race condition fix (PR 3883)
3904 Backport fix for "IDisposable & InstancePerTestCase" (PR 3843)
3929 Fix high precision decimal calculations in v3.13 (#3898)
3959 Marked 'NUnitEqualityComparer.AreEqual(object, object, Tolerance, bool)' as obsolete
3962 Ensure that AfterTest always runs in AfterTestCommand
3971 Backport "Add missing [DoesNotReturn] annotations" from #3958
3976 Equivalency fallback for non-IComparable types can leave CollectionTally in corrupt state
3998 Eagerly determine when a set is unsortable
3999 Numeric comparison fails when it should succeed.
4000 OverflowException comparing large double values
4007 Eagerly detect sortable types for equivalency tests in 3.13.x
4030 IsEmpty doesn't work with new .NET6 PriorityQueue
4032 Tests won't run with an abstract base class that has a TestCaseFixtureSource
4033 Recognized private members in base class for Source attributes
4034 Improve method discovery and filtering performance
4041 Minimize empty array allocations via centralized helper for pre-net46
4043 Stop testing the framework against netcoreapp21 in v3.13 branch
4045 Drop netcore2.1 as a target (backport #3986)
4058 Remove TopLevel property from ValueMatchFilter

NUnit 3.13.2 - April 27, 2021

This release fixes a new issue with the FixtureLifeCycle attribute where IDisposable test fixtures were not being disposed properly. As always, @gleb-osokin has been a great help with this new feature.

It also fixes a long-standing performance issue with CollectionAssert.AreEquivalent and the CollectionEquivalentConstraint when comparing large collections. The deep comparison that NUnit performs on the two collections will always have a worst case bound of O(n^2) but we have optimized it so that the majority of use cases will be closer to O(n).

We've also made significant optimizations to the OR filters for selecting tests using their full name. This dramatically improves test performance for large code bases that use dotnet test. Thanks to @pakrym for his help with this.

Issues Resolved

2799 CollectionAssert.AreEquivalent is extremely slow
3589 File headers, copyrights, and licenses
3773 IDisposable not working with InstancePerTestCase
3779 Obsolete AreEqual methods with nullable numeric arguments for 3.13
3784 Build the v3.13-dev branch
3786 NUnit with dotnet test results in O(n^2) filtering complexity
3810 Enable deterministic build
3818 AppVeyor failing to build v3.13-dev branch PRs
3832 Deploy v3.13-dev branch builds to MyGet

NUnit 3.13.1 - January 31, 2021

This release addresses several misses with the new FixtureLifeCycle attribute, switches to using SourceLink and NuGet snupkg packages for debugging into NUnit from your unit tests. It also addresses issues with the time format of ignored and explicit tests in the test results file.

Issues Resolved

2339 Wrong date format in Ignored TestFixtures
3715 FixtureLifeCycle(LifeCycle.InstancePerTestCase) Not working with TestFixtureSource
3716 Assembly level FixtureLifeCycle(LifeCycle.InstancePerTestCase) doesn't work
3724 Test start and end time should end with Z
3726 Assert EqualTo().Within().Seconds does not work with DateTimes in NUnit 3.13
3729 AppVeyor builds failing
3736 AreEqual.Within throws on failure with non-numeric types
3743 Parametrized tests do not respect FixtureLifeCycle.InstancePerTestCase
3745 After upgrading to NUnit 3.13.0 the debugger enters NUnit code despite having checked "Enable Just My Code"

NUnit 3.13 - January 7, 2021

The FixtureLifeCycle attribute has been added to indicate that an instance for a test fixture or all test fixtures in an assembly should be constructed for each test within the fixture or assembly.

This attribute may be applied to a test fixture (class) or to a test assembly. It is useful in combination with the Parallelizable Attribute so that a new instance of a test fixture is constructed for every test within the test fixture. This allows tests to run in isolation without sharing instance fields and properties during parallel test runs. This make running parallel tests easier because it is easier to make your tests thread safe.

This release also fixes several issues running tests in .NET 5.0. If your tests target .NET 5.0, we recommend updating to this release.

Issues Resolved

34 Async testing with F#
52 Self-contained item in array causes stack overflow
1394 Has.Property cannot see explicit interface implementation properties
1491 Add a CLA to the project
1546 NUnitEqualityComparer.GetEquatableGenericArguments should explicitly order arguments
1809 Assert.AreEqual fails for Complex on Linux
1897 EqualTo().Using() prevents caller from comparing strings to anything else
2211 Add support of indexers to the PropertyConstraint
2222 Switch to one Release branch
2477 Parameterized fixture with Explicit attribute can not be run when selected by name
2574 Instance-per-test-case feature
2680 Deprecate the DebugWriter class
3611 Properties are shown when --explore:nunit3 is run on entire project, but omitted when using the --where clause
3054 Don't enforce [Timeout] when debugger is attached
3075 Complete RunAsyncAction tests in FrameworkControllerTests
3228 Modulo bias is present in Randomizer.NextDecimal(decimal)
3240 Automate uploading of test results to Azure Pipelines
3243 Azure DevOps does not build release branch
3249 Pin GitLink version to speed up Cake script
3251 RawInt32() can't use Next since the maximum is always exclusive and it would never return int.MaxValue
3252 Timeout of 100 ms in TestTimeoutDoesNotStopCompletion occasionally fails the macOS build
3253 Chance of failure in random bias tests is not sufficiently low for CI
3256 Building under VS2019
3257 Running under mono
3259 The type of an Array isn't inferred from properly
3264 Test that IRepeatTest only gets attributes via the IMethodInfo interface
3275 Enable setting IgnoreUntilDate in TestCaseData.Ignore
3279 Improve failure message from UniqueItemsConstraint
3282 TimeoutAttribute makes all Assertions count as failure
3283 ExecutionContext is flowed between unrelated tests
3286 Testing for equality using a predicate throws exception for collections
3290 'Good first issue' or 'help wanted' issue count badge
3296 ExceptionHelper.GetExceptionMessage(Exception ex) should tolerate exceptions from exceptions
3302 Incorrect formatting of failure message if test fails with Assert.Multiple
3303 Check type of actual argument using consistent helper method
3304 CheckString should not be a generic method
3305 Remove unused methods
3307 Sporadic GetResultIsNotCalledUntilContinued failure
3308 Fix disposal in EnumerablesComparer
3309 Simplify code in EventListenerTextWriter
3311 Minimal unit of DateTime in the report when Test was started/ended
3312 Simplify ProviderCache and make it instantiable since it is intentionally not thread safe
3315 Assert.DoesNotThrow() stopped working as it was previously
3318 Fix AwaitAdapter terminology
3321 Keep dependencies up to date
3322 Speed up build script by removing unnecessary builds
3324 Broken link in CHANGES.md
3328 Problems when using a mixture of Not and Or filters in NUnit framework 3.12.0
3331 Contains.Key no longer working for IDictionary
3338 Azure Pipelines is failing on Linux for both netstandard 1.4 and 2.0
3356 SetUpFixture not run
3368 Tests with warnings are not added to console TestResult.xml total count
3383 Drop netstandard1.4 and stop testing on end-of-life versions of .NET Core
3389 Show names of parameters
3390 SetUpFixture not being triggered when running tests using --testlist
3392 Use of Thread.CurrentPrincipal in Blazor/WASM
3393 Nuget Package Not Signed
3395 Randomizer.NextString() can probably be sped up
3408 Save test results as build artifacts
3411 Update nuspec file to mention support for NET Standard 2.0+
3414 Azure pipelines are failing on Linux
3415 Azure CI: Still publish test results on failure
3423 TestResult.cs casts ITestResult to TestResult
3447 Is.EqualTo(...).Using(StructuralComparisons.StructuralEqualityComparer or StructuralComparer) not working
3452 Assertions that use an existing Regex
3453 Visibility of SetUp/TearDown Methods
3454 Pre-Filtering in NUnitLite has problems
3464 Improve debugging experience
3470 Assertion for key-value-pair
3475 Our XML comments are using <code> (block element) instead of <c> (inline element)
3485 Should we make MultipleAssertException.TestResult maybe-null or obsolete two constructors?
3496 Adding data dictionary should not add a trailing newline
3497 Fix mixed line endings in Git
3503 Remove implicit cast from ITestResult to TestResult
3505 Better failure messages for Subset and Superset constraints
3506 ValueTuple tests now running if not targeting NET35
3536 Reduce newly added API surface
3542 Update NuGet Package Icons
3547 DelayedConstraint constrains does not preserve original result additional information
3551 Add PrivateAssets="all" to analyzer dependency
3552 MessagePumpStrategy does not work for WPF on netcoreapp3.0 and upwards
3559 Disables the DOC100 suggestion and reverts the added paragraph elements
3563 Improve TextMessageWriter output for numeric values
3565 .NET 5 issue with PlatformAttribute
3583 Avoid using a culture-sensitive EndsWith in common code
3592 Add classname and methodname to the start-test event
3594 Reduce memory overhead of TestNameGenerator
3596 AreAlmostEqualUlps throws OverflowException for -0
3598 Fix typo
3608 [Platform] attribute fails with DllNotFoundException in WASM
3616 Extend Is.Empty to work for Guid.Empty
3618 NUnit has a P/Invoke whose native function doesn't exist on all platforms
3622 EmptyDirectoryConstraint doesn't need to enumerate entire directory contents
3632 Assert.Inconclusive() reports failed when timeout used
3636 NUnitLite filtering fails if space in test name before (
3641 Type implementing IComparable<float> (or any IComparable) fails comparison.
3647 Fix exception under Blazor 5
3650 Build issue with the latest .NET SDK 5.0.100-rc.2
3657 Add Framework Version to the XML
3662 TestContext.CurrentContext.CurrentRepeatCount only contains retry count not the repeat count
3667 Create FrameworkPackageSetting to set CurrentCulture and CurrentUICulture
3676 Parallelizeable tests sometimes shares memory
3679 Issue 3390: Do not prefilter relevant SetUpFixtures
3694 Async tests causes double failure messages
3699 Compilation of netcoreapp3.1 targets fails on CI (both AppVeyor and Azure Pipelines)

NUnit 3.12 - May 14, 2019

This release of NUnit finally drops support for .NET 2.0. If your application still targets .NET 2.0, your tests will need to target at least .NET 3.5. Microsoft ended support for .NET 2.0 on July 12, 2011. Microsoft recommends that everyone migrate to at least .NET Framework 3.5 SP1 for security and performance fixes.

This release dramatically improves NUnit support for async tests including returning ValueTask and custom tasks from tests, improved handling of SynchronizationContexts and better exception handling.

The .NET Standard 2.0 version of NUnit continues to gain more functionality that is found in the .NET 4.5 version of the framework like setting the ApartmentState and enabling Timeout on tests.

Issues Resolved

474 TypeHelperTests.cs is orphaned
999 Support multiple TestOf attributes per test
1638 TimeoutAttribute not available when targeting netcoreapp framework
2168 ThrowsAsync reports OperationCanceledException as TaskCanceledException
2194 How to use Contains.Substring with And
2286 Add support for custom Task (i.e. ValueTask)
2579 AppVeyor Test Failures under .NET 3.5
2614 TestExecutionContext.CurrentContext is saved in Remoting CallContext between test runs
2696 Getting WorkerId fails in debug
2772 Random failing of parallel test run: Unhandled Exception: System.InvalidOperationException: Stack empty.
2975 ComparisonConstraints are allocating string on construction
3014 Timeout failures on MacOS
3023 NUnit runner fails when test method returns ValueTask<>
3035 Apartment state can't be used for .NET Standard 2.0 tests
3036 Apartment state can't be used for .NET Standard 2.0 tests
3038 TestName in TestCase attribute not validated to be not empty
3042 RequiresThreadAttribute allows ApartmentState.Unknown, unlike ApartmentAttribute
3048 Add .idea folder to .gitignore
3053 Conversion from TestCase string parameter to DateTimeOffset
3059 Constraint Throws.Exception does not work with async return value
3068 First Chance Exception in RuntimeFramework
3070 End support for .NET Framework 2.0 (released in 2005)
3073 CollectionAssert.AreEquivalent fails for ValueTuple Wrapped Dictionary
3079 Regression from 3.10 to 3.11: Range in bytes
3082 Is.Ordered.By
3085 XML Test-Suite Assembly does not contain DLL path anymore
3089 Remove outdated comment
3093 Tests having TaskLike objects as their return type throws Exception
3094 Bad error message if collections have different types
3104 Removed NET20 compile output
3105 Add tests for use of ApartmentState.Unknown in RequiresThreadAttribute
3107 Declare class in Program.cs provided with NUnitLite Nuget package static
3109 Azure DevOps build fails in Save package artifacts
3124 Switch copyright notice
3128 Correct documentation on ParallelScope
3137 Fix doc-comments in NUnitTestAssemblyRunner
3138 Assert.Ignore breaks when a Task is returned w/o using async/await
3139 Add Azure pipelines badge to front page
3144 Retry attribute should not derive from PropertyAttribute
3145 Capture additional exception details in the test output
3156 UnexpectedExceptionTests should tolerate Mono on Azure DevOps Ubuntu
3159 Make tests more tolerant
3161 https url repo
3166 Allow static SetUpFixture classes
3171 Incorrect type for Test Fixtures when using running explore with a filter
3175 Improve user-facing messages
3181 Template Based Test Naming - Incorrect truncation for individual arguments
3186 Fix licenseUrl element in nuspec, will be deprecated
3193 Cake Build Fails with Visual Studio 2019
3195 Drop or at least make Travis not required?
3231 Breaking change in filter functionality between framework 2.7 and 3.11
3209 Test fail when posting to SynchronizationContext.Current
3211 Fix logging
3218 Remove to-dos from the code base
3222 Our build script tests hang when run with Mono on Windows
3233 AndConstraint should write additional information from failed constraint

NUnit 3.11 - October 6, 2018

More informative assertion messages
PlatformAttribute is available on and now detects .NET Core
ValuesAttribute now works with nullable types
Async tests detecting and running Windows Forms or WPF message pumps rather than deadlocking
Support for UWP 10.0 is back via .NET Standard 1.4

Issues Resolved

352 Test with infinite loop in TearDown cannot be aborted
452 Deprecate the existing Chocolatey framework package
660 Order dependence of And and Or constraints should be documented
1200 async test + Apartment(ApartmentState.STA) => await not returning on STA thread
2123 Task.Run inside a test will result in deadlock if a control was created previously
2146 Assert.That with a Throws constraint does not provide as much info as Assert.Throws
2427 PropertyConstraint throws away the more helpful message in the base constraint result
2432 Ability to exclude/include the platform .NET Core
2450 NullReferenceException in ExceptionHelper.BuildMessage on Mono
2536 SetArgDisplayNames for TestCaseData and TestFixtureData
2611 Enable .NET Standard 1.6 tests on non-Windows
2693 Ensure that ReSharper settings are consistent with the editorconfig configuration
2757 Broken char comparison in v3.7 and higher
2759 Test fails with "No arguments were provided" error when no values returned from IParameterDataSource
2761 Infinite loop in nunit 3.9
2781 Fixed pre-compiler typo
2786 Timeout value not resetting on Retry of failed test
2790 Removing ITypeInfo abstraction
2798 [Request] Show actual count value when test fail on Has.Exactly(x).Items
2814 Remove public marker types
2819 Only run AppVeyor PR build against open PRs
2821 Save and restore the SynchronizationContext before and after each test case
2823 SetUp failed for test fixture - Array was not a one-dimensional array. Issue seems related to byte[,] method parameters
2829 Obsoletion warning for DataAttribute
2831 Regular "BusyExecIdle after 200 milliseconds delay" CI failures
2833 Use longer BusyExecIdle to avoid CI failures
2836 NUnit.Framework.Does cannot be extended
2837 DictionaryContainsKeyConstraint behavior is inconstant with Dictionary.ContainsKey when the dictionary uses a custom Comparer
2842 Supporting inheritance of Assert and related classes
2854 Has.All.../Has.None... - show non-matching items in error message
2863 Make tests robust without depending on the order of attributes
2867 Skip executing TestCaseSources for tests which are not included in the filter
2876 Implement Discovery-time filtering for NUnitLite
2883 Our public ConcurrentQueue causes type conflicts
2885 Copy/paste error in Assert.That documentation
2887 NETStandard 1.3 support dropped in NUnit 3.10
2896 Some tests are silently skipped on netstandard1.x since #2796
2898 AssemblyPath contains invalid characters
2901 Values attribute support for nullable bool and enum types
2923 Update outdated CategoryAttribute xml doc
2928 Improve error message on EmptyConstraint
2929 Added NUnit XML schemas
2940 Increase StackTracesAreFiltered amount to 5
2955 Potential threading issue in IsolatedContext
2965 NuGet Package : Add repository metadata.
2970 InvalidCastException @ NUnit.Framework.TestFixtureSourceAttribute.BuildFrom
2979 Warn.If in Assert.Multiple
2994 Error in .NET Standard 1.4 DictionaryContainsKeyConstraint MetadataToken compatibility methods
2996 Remove unused enum
3009 Fix failing CI Builds by upgrading to NUnit Console 3.9.0
3020 Upgrade nunit-vs-adapter to 3.10 for nUnit 3.11
3024 Unable to add .IgnoreCase modifier to an AnyOf constraint in collection constraints
3032 APIs to restore before 3.11

NUnit 3.10.1 - March 12, 2018

Added a namespace to the props file included in the NuGet package to make it compatible with versions of Visual Studio prior to VS 2017.

NUnit 3.10 - March 12, 2018

This release adds a .NET Standard 2.0 version of the framework which re-enables most of the features that have been missing in our earlier .NET Standard builds like parallelism, timeouts, directory and path based asserts, etc. It also contains numerous bug fixes and smaller enhancements. We've improved our XML docs, fixed performance issues and added more detail to Multiple Asserts.

This release also contains source-indexed PDB files allowing developers to debug into the NUnit Framework. This allows you to track down errors or see how the framework works.

In order to support the .NET Standard 2.0 version, the NUnit project switched to the new CSPROJ format and now requires Visual Studio 2017 to compile. This only effects people contributing to the project. NUnit still supports building and compiling your tests in older .NET IDEs and NUnit still supports older versions of the .NET Framework back to 2.0. For contributors, NUnit can now compile all supported targets on Windows, Linux and Mac using the Cake command line build.

Issues Resolved

1212 Separate AssertionHelper project or assembly
1373 Setting with a null value
1382 Use array argument contents in name of parameterized tests rather than just array type.
1578 TestContext.CurrentTest exposes too much internal info
1678 Result Message: OneTimeSetUp: Category name must not contain ',', '!', '+' or '-'
1944 Removing Compact Framework workarounds
1958 System.Reflection.TargetInvocationException after run finished
2033 Nameof refactor
2202 Best practices for XML doc comments
2325 Retry attribute doesn't retry the test.
2331 Repo does not build in VS without running build -t build first
2405 Improve PropertyConstraint error output
2421 Publishing symbols with releases
2494 CollectionAssert.AllItemsAreUnique() very slow
2515 Re-target Solution to use the New CSPROJ Format
2518 Bug in CollectionAssert.AreEqual for ValueTuples.
2530 Running tests on main thread. Revisiting #2483
2542 NUnit does not support parallelism on .NET Core 2.0
2555 CI timeout: NUnit.Framework.Assertions.CollectionAssertTest.PerformanceTests
2564 Add minClientVersion to .nuspec files
2566 Refactor SimpleEnumerableWithIEquatable test object
2577 Warning in TearDown is inconsistent with Assertion failure
2580 Remove unused defines
2591 NUnitEqualityComparer.Default should be replaced with new NUnitEqualityComparer()
2592 Add .props with ProjectCapability to suppress test project service GUID item
2608 Culture differences on .NET Core on non-Windows causes test failures
2622 Fix flakey test
2624 Prevent emails for successful builds on Travis
2626 SetUp/TearDown methods are invoked multiple times before/after test in .NET Standard targeted projects
2627 Breaking change in CollectionAssert.AllItemsAreUnique with NUnit 3.9
2628 Error during installing tools when running build script
2630 Framework throws NullReferenceException if test parameter is marked with [Values(null)]
2632 Parallel tests are loading 100% CPU when nested SetUpFixture exists
2639 ValuesAttribute causes ExpectedResult to have no effect
2647 Add Current Attempt indicator in TestContext for use with RetryAttribute
2654 Address feedback from @oznetmaster
2656 NuGet package links to outdated license
2659 Naming Errors
2662 NullReferenceException after parallel tests have finished executing
2663 Building NUnit .NET 4.5 in VS2017 fails
2669 Removed vestigial build script helper method
2670 Invalid assemblies no longer give an error message
2671 Ensure that FailureSite.Child is used where appropriate.
2685 Remove Rebracer file
2688 Assert.Throws swallows console output
2695 MultipleAssertException doesn't provide proper details on failures
2698 Syntax suggestions errors as warnings
2704 Add Constraint to test whether actual item is contained in expected collection
2711 NUnitLite: Add support for --nocolor option
2714 AnyOfConstraint enumerates multiple times
2725 Enable 'strict' compilation flag
2726 Replace the ConcurrentQueue and SpinWait compatibility classes
2727 Avoid treating warnings as errors inside the IDE
2734 TestCaseAttribute: ExpectedResult should support same value conversion as normal method arguments
2742 FailureSite not correctly set on containing suites when tests are ignored.
2749 Update Travis SDK versions

NUnit 3.9 - November 10, 2017

This release addresses numerous parallelization issues that were introduced in 3.8 when method level parallelization was added. Most of the parallelization issues resolved were tests never completing when using some combinations of parallel tests and ApartmentState not being properly applied to tests in all cases.

Issues Resolved

893 Inconsistent Tuple behavior.
1239 NUnit3 sometimes hangs if SetUpFixtures are run in parallel
1346 NullReferenceException when [TestFixtureSource] refers to data in a generic class.
1473 Allow Is.Ordered to Compare Null Values
1899 Constraint Throws.Exception does not catch exception with async lambdas
1905 SetupFixture without namespace will make assembly-level Parallelizable attribute useless
2091 When a native exception of corrupted state is thrown, nunit test thread crashes and the nunit-console process hangs
2102 NUnitLite incorrectly reports Win 10 OS name
2271 When CollectionAssert.AreEqual do compare each element, it will ignore the IEquatable of the element too
2289 ResolveTypeNameDifference does not handle generic types well
2311 Resolve test projects' namespace situation
2319 Add .editorconfig to set file encodings so that people don't have to think about it
2364 Parallelizable attribute not invalidating invalid parallel scope combinations
2372 Create testing for compounded ConstraintFilters
2388 Parallelization causes test cases to stop respecting fixture's apartment state
2395 NUnit 3.8+ does not finish running tests
2398 NUnit CI spurious failures, NUnit.Framework.Internal.ThreadUtilityTests.Kill
2402 --labels=All doesn't show anything in console output executing NUnitLite Console Runner
2406 Summary descriptions replaced by more detailed ones
2411 And constraint on Has.Member throws
2412 Using fluent syntax unintentionally removed in 3.8
2418 Support equality comparison delegate
2422 Has.Property causes AmbiguousMatchException for shadowing properties
2425 XML doc typo fix
2426 Regression in 3.8.1: ApartmentAttribute no longer works when applied to an assembly
2428 Fix NullReferenceExceptions caused by WorkItemQueue not being thread-safe
2429 Stack trace shown for Assert.Warn
2438 [Parallelizable] hangs after a few tests
2441 Allows to override load-time/execution-time interfaces in built-in tests attributes
2446 CI failure in mono Warning tests
2448 Inherited Test SetUp, TearDown, etc. are not executed in .NET Core if they are not public
2451 Compile RegEx to improve performance
2454 SetUpFixture not respecting NonParallelizable tag on TestFixtures.
2459 [Parallelizable(ParallelScope.Children)] Unable to finish tests
2465 Possible wrong properties are returned by reflection in ReflectionExtensions.cs
2467 Test execution hangs when using [SetUpFixture] with NUnit 3.8.x
2469 Allow RangeAttribute to be specified multiple times for the same argument
2471 Parametrized test cases not running in parallel
2475 Framework incorrectly identifies Win 10 in xml results
2478 Attributes on SetUpFixture are not applied
2486 Message when asserting null with Is.EquivalentTo could be more helpful
2497 Use ConstraintUtils.RequireActual through out the codebase
2504 Support changing test display name on TestFixtureData
2508 Correct divergence from shadowed Is / Has members.
2516 When test writes something to the stdErr there is no guaranteed way to link a test-output event to a target test using ITestEventListener
2525 Remove unwanted space from comment
2526 SerializationException in low trust floating point equality test
2533 Matches<T>(Predicate<T>) throws ArgumentException or Fails when actual is null
2534 SetUpFixture causes NUnit to lock with Apartment( STA )
2551 CollectionItemsEqualConstraint is missing Using(Func<T, T, bool>)
2554 Made TestFixtureData.SetName internal for 3.9

NUnit 3.8.1 - August 28, 2017

This release fixes two critical regressions in the 3.8 release. The first caused the console runner to crash if you are using test parameters. The second issue caused collection constraints checking for multiple items in a collection to fail.

Issues Resolved

2386 Contains.Item() fails for collections in NUnit 3.8
2390 Missing value attribute in test parameters setting causes NullReferenceException in console

NUnit 3.8 - August 27, 2017

This release removes several methods and attributes that were marked obsolete in the original 3.0 release. Support for iOS and Android has been improved.

An issue that caused unit tests to run slower was addressed as was a bug that prevented the use of Assert.Multiple in async code.

The Order attribute can now also be applied to the class level to set the order that test fixtures will be run.

Issues Resolved

345 Order of Fixture Execution
1151 Include differences in output for Is.EquivalentTo
1324 Remove CollectionContainsConstraint
1670 Attaching files to the test result
1674 InRange-Constraint must work with object
1851 TestCaseSource unable to pass one element byte array
1996 Timeout does not work if native code is running at the time
2004 Has.One as synonym for Has.Exactly(1).Items
2062 TestCaseSource attribute causes test to pass when source is not defined
2144 Allow option on RandomAttribute to produce distinct values
2179 Some NUnit project's tests fail on systems with CultureInfo other than en
2195 Contains.Substring with custom StringComparison
2196 Expose ParallelizableAttribute (and other attribute) constructor arguments as properties
2201 Invalid platform name passed to PlatformAttribute should mark test NotRunnable
2208 StackFilter trims leading spaces from each line
2213 SetCultureAttribute: CultureInfo ctor should use default culture settings
2217 Console runner performance varies wildly depending on environmental characteristics
2219 Remove Obsolete Attributes
2225 OneTimeTearDown and Dispose Ordering
2237 System.Runtime.Loader not available for iOS/Android
2242 Running tests directly should never surface a NullReferenceException
2244 Add KeyValuePair<TKey, TValue> to the default formatters
2251 Randomizer.NextGuid()
2253 Parallelizable(ParallelScope.Fixtures) doesn't work on a TestFixture
2254 EqualTo on ValueTuple with Nullable unexpected
2261 When an assembly is marked with ParallelScope.None and there are Parallelizable tests NUnit hangs
2269 Parallelizable and NonParallelizable attributes on setup and teardown silently ignored
2276 Intermittent test failures in Travis CI: TestContextTests
2281 Add type constraint for Throws and any method requiring Exception
2288 Killing thread cancels test run
2292 Is.Ordered.By() with a field throws NullReferenceException
2298 Write TestParametersDictionary to xml result file in readable format
2299 NUnitLite NuGet package no longer installs NUnit NuGet package
2304 Revert accidental doc removal
2305 Correct misprint ".con" -> ".com"
2312 Prevent crash on invalid --result parsing in NUnitLite
2313 Incorrect xml doc on RetryAttribute
2332 Update build script to use NUnitConsoleRunner v3.7.0
2335 Execute OneTimeTearDown as early as possible when running fixtures in parallel
2342 Remove deprecated Is.String* Constraints
2348 Can't use Assert.Multiple with async code
2353 Provide additional Result information through TestContext
2358 Get framework to build under Mono 5.0
2360 Obsolete CollectionContainsConstraint Constructors
2361 NUnit Parallelizable and OneTimeSetUp with no namespace results in single-threaded test execution
2370 TestCaseAttribute can't convert int to nullable long

NUnit 3.7.1 - June 6, 2017

This is a hotfix release that addresses occasional hangs when using test parallelization and fixes crashes in NCrunch prior to version 3.9.

Issues Resolved

2205 NCrunch: System.Xml.XmlException: Root element is missing, when adding NUnit 3.7.0
2209 NUnit occasionally hangs when parallelizable TestFixture has OneTimeSetUp and OneTimeTearDown

NUnit 3.7 - May 29, 2017

This release of NUnit expands on parallel test execution to allow test methods to be run in parallel. Please see the Parallelizable Attribute for more information.

NUnit 3.7 also drops the Portable build of the framework and replaces it with a .NET Standard 1.3 version to compliment the .NET Standard 1.6 version. This change enables several constraints and other features in the .NET Standard builds that weren't available in portable like Path and Directory based asserts.

The AssertionHelper class has been deprecated because it is seldom used and has not received any of the updates that Asserts and Constraints receive. If your code is using the AssertionHelper class, we recommend that you migrate your asserts.

Issues Resolved

164 Run test methods within a fixture in parallel
391 Multiple Assertions
652 Add ability to execute test actions before SetUp or OneTimeSetUp
1000 Support multiple Author attributes per test
1096 Treat OneTimeSetup and OneTimeTearDown as separate work items
1143 NUnitLite - Explore flag does not apply where filter to output
1238 Feature request: Print LoaderExceptions when fixture loading fails
1363 Make Timeouts work without running test on its own thread
1474 Several SetUpFixtures at the same level may be active at the same time
1819 TestContext.Progress.Write writes new line
1830 Add --labels switch changes to NUnitLite and NUnitLite tests
1859 ConcurrentQueue is duplicate with System.Threading.dll package
1877 Resolve differences between NUnit Console and NUnitLite implementations of @filename
1885 Test parameter containing a semicolon
1896 Test has passed however Reason with an empty message is printed in the xml
1918 Changing DefaultFloatingPointTolerance breaks tests running in parallel
1932 NUnit Warn class should be removed from stack trace by filter
1934 NullReferenceException when null arguments are used in TestFixtureAttribute
1952 TestContext.Out null when used in task with .NET Core
1963 Investigate removing SpecialValue
1965 TestContext does not flow in async method
1971 Switch CHANGES.txt to Markdown
1973 Implemented TestExecutionContext to use AsyncLocal<> for NETSTANDARD1_6
1975 TestFixtureSource doesn't work with a class that has no namespace
1983 Add missing ConstraintExpression.Contain overload
1990 Add namespace filter
1997 Remove unused --verbose and --full command line options
1999 Author Tests assume ICustomAttributeProvider.GetCustomAttributes return order is defined
2003 Better user info about ParallelizableAttribute and ParallelScope
2005 Exclude empty failure messages from results xml
2007 3.6 Multiple assertion backwards compatibility
2010 Add DelayedConstraint in NetStandard 1.6 build
2020 Better message when timeout fails
2023 Ability to abort threads running a message pump
2025 NullReferenceException using Is.EqualTo on two unequal strings
2030 Add method to mark tests as invalid with a reason
2031 Limit Language level to C#6
2034 Remove SilverLight project - no longer used
2035 NullReferenceException inside failing Assert.That call
2040 Cannot catch AssertionException
2045 NUnitLite-runner crashes if no file is provided
2050 Creation of TestExecutionContext should be explicit
2052 NullReferenceException with TestCaseSource if a property has no setter
2061 TestContext.WorkDirectory not initialized during build process
2079 Make TestMethod.Arguments public or otherwise accessible (e.g. TestContext)
2080 Allow comments in @FILE files
2087 Enhance error message: Test is not runnable in single-threaded context. Timeout
2092 Convert Portable library to .NET Standard 1.3
2095 Extend use of tolerance to ComparisonConstraints
2099 Include type in start-suite/start-test report elements
2110 NullReferenceException when getting TestDirectory from TestContext
2115 Mark AssertionHelper as Obsolete
2121 Chained PropertyConstraint constraints report incorrect ActualValue
2131 Remove "Version 3" suffix from NUnitLite NuGet Package
2132 TestFixtureTests.CapturesArgumentsForConstructorWithMultipleArgsSupplied assumes order of custom attributes
2143 Non-parallel fixture with parallel children runs in parallel with other fixtures
2147 Test Assembly using NUnitLite & NUnit 3.6.1 hangs under .NET Core when --timeout is supplied on command line
2150 Add portable-slow-tests to Cake file
2152 Allow attaching files to TestResults
2154 Fix execution of non-parallel test fixtures
2157 Getting WorkerId inside Assert.Throws / DoesNotThrow returns null instead of previous non-null value
2158 Update SetupFixtureAttribute XML Docs
2159 Prevent crash in .NET standard with log file path
2165 Trying to install NUnit 3.6.1 on .NET Framework asks for download of 20 more packages
2169 Incorrect xml docs for SetUpAttribute
2170 Cake build fails if only Visual Studio 2017 installed
2173 Remove PreTestAttribute and PostTestAttribute
2186 Replace special characters as part of converting branch names to package versions
2191 System.Reflection.TargetInvocationException with nunit3-console --debug on Mono

NUnit 3.6.1 - February 26, 2017

This is a hotfix release of the framework that addresses critical issues found in the 3.6 release.

Issues Resolved

1962 A Theory with no data passes
1986 NUnitLite ignores --workers option
1994 NUnitLite runner crashing when --trace is specified
2017 Two NUnit project's tests fail on systems with comma decimal mark settings
2043 Regression in 3.6.0 when catching AssertionException

NUnit 3.6 - January 9, 2017

This release of the framework no longer includes builds for Compact Framework or for SilverLight, but adds a .NET Standard 1.6 build. If anyone still using Compact Framework or SilverLight and would like to continue development on those versions of the framework, please contact the NUnit team.

Framework

.NET Standard 1.6 is now supported
Adds support for Multiple Assert blocks
Added the --params option to NUnitLite
Theories now support Nullable enums
Improved assert error messages to help differentiate differences in values
Added warnings with Warn.If(), Warn.Unless() and Assert.Warn()
Enabled Path, File and Directory Asserts/Constraints for .NET Core testing
Added NonTestAssemblyAttribute for use by third-party developers to indicate that their assemblies reference the NUnit framework, but do not contain tests

Issues Resolved

406 Warning-level Assertions
890 Allow file references anywhere in the command line.
1380 AppVeyor Failures when branch name is too long
1589 Split the nunit repository into multiple repositories
1599 Move Compact Framework to separate project
1601 Move SilverLight to a separate project
1609 Upgrade Cake build to latest version
1661 Create .NET Standard Framework Build
1668 Need implementation-independent way to test number of items in a collection
1743 Provide multiple results for a test case in the XML output
1758 No direct inverse for Contains.Key
1765 TestCaseSourceAttribute constructor for method with parameters
1802 Design Multiple Assert syntax as seen by users
1808 Disambiguate error messages from EqualConstraint
1811 Build.ps1 fails if spaces in path
1823 Remove engine nuspecs and old global.json
1827 Remove unused repository paths from repositories.config
1828 Add Retry for failed tests only
1829 NUnitLite accepts --params option but does not make any use of it.
1836 Support nullable enums in Theories
1837 [Request] AfterConstraint to support more readable usage
1840 Remove SL and CF #Defined source
1866 [Request] More readable way to set polling interval in After constraint
1870 EqualConstraint result failure message for DateTime doesn't show sufficient resolution
1872 Parameterized method being called with no parameter
1876 What should we do about Env.cs
1880 AttributeUsage for various Attributes
1889 Modify NUnitLite to display multiple assert information
1891 TestContext.Progress and TestContext.Error silently drop text that is not properly XML encoded
1901 Make NUnitLite-runner Prefer32Bit option consistent across Debug/Release
1904 Add .NET Standard 1.6 Dependencies to the Nuspec Files
1907 Handle early termination of multiple assert block
1911 Changing misleading comment that implies that every ICollection<T> is a list
1912 Add new warning status and result state
1913 Report Warnings in NUnitLite
1914 Extra AssertionResult entries in TestResults
1915 Enable Path, File and Directory Assert/Constraints in the .NET Standard Build
1917 Use of IsolatedContext breaks tests in user-created AppDomain
1924 Run tests using the NUnit Console Runner
1929 Rename zip and remove source zip
1933 Tests should pass if test case source provides 0 test cases
1941 Use dictionary-based property for test run parameters
1945 Use high-quality icon for nuspecs
1947 Add NonTestAssemblyAttribute
1954 Change Error Message for Assert.Equals
1960 Typo fixes
1966 Xamarin Runner cannot reference NUnit NuGet Package

Earlier Releases

Release Notes for NUnit 2.9.1 through 3.5
Release Notes for NUnit 2.6 through 2.6.4
Release Notes for NUnit 2.5 through 2.5.10
Release Notes for NUnit 2.4 through 2.4.8
Release Notes for NUnit 2.0 through 2.2.10