RustPython
diff --git a/‎extra_tests/snippets/builtin_bytes.py
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+2Lines changed: 2 additions & 0 deletions b/‎extra_tests/snippets/builtin_bytes.py
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diff --git a/‎extra_tests/snippets/stdlib_math.py
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+2Lines changed: 2 additions & 0 deletions b/‎extra_tests/snippets/stdlib_math.py
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@@ -667,5 +667,7 @@ def __new__(cls, value):
         return me
 b = B1.fromhex('a0a1a2')
 assert b.foo == 'bar'
+import sys
+assert b'-\xff'.decode(sys.getfilesystemencoding(), 'surrogateescape') == '-\udcff'
 
 skip_if_unsupported(3,11,test__bytes__)
@@ -291,3 +291,5 @@ def assertAllNotClose(examples, *args, **kwargs):
 assert math.fmod(-3.0, NINF) == -3.0
 assert math.fmod(0.0, 3.0) == 0.0
 assert math.fmod(0.0, NINF) == 0.0
+
+assert math.gamma(1) == 1.0