diff --git a/src/Symfony/Component/Process/CHANGELOG.md b/src/Symfony/Component/Process/CHANGELOG.md
index 7193c498d4326..8cbd98f23f779 100644
--- a/src/Symfony/Component/Process/CHANGELOG.md
+++ b/src/Symfony/Component/Process/CHANGELOG.md
@@ -1,6 +1,20 @@
 CHANGELOG
 =========
 
+4.0.0
+-----
+
+ * environment variables will always be inherited
+ * added a second `array $env = array()` argument to the `start()`, `run()`,
+   `mustRun()`, and `restart()` methods of the `Process` class
+ * added a second `array $env = array()` argument to the `start()` method of the
+   `PhpProcess` class
+ * the `ProcessUtils::escapeArgument()` method has been removed
+ * the `areEnvironmentVariablesInherited()`, `getOptions()`, and `setOptions()`
+   methods of the `Process` class have been removed
+ * support for passing `proc_open()` options has been removed
+ * removed the `ProcessBuilder` class, use the `Process` class instead
+
 3.4.0
 -----
 
diff --git a/src/Symfony/Component/Process/PhpProcess.php b/src/Symfony/Component/Process/PhpProcess.php
index 7afd182f5afbb..e2359dfc02e2f 100644
--- a/src/Symfony/Component/Process/PhpProcess.php
+++ b/src/Symfony/Component/Process/PhpProcess.php
@@ -31,9 +31,8 @@ class PhpProcess extends Process
      * @param string|null $cwd     The working directory or null to use the working dir of the current PHP process
      * @param array|null  $env     The environment variables or null to use the same environment as the current PHP process
      * @param int         $timeout The timeout in seconds
-     * @param array       $options An array of options for proc_open
      */
-    public function __construct($script, $cwd = null, array $env = null, $timeout = 60, array $options = null)
+    public function __construct($script, $cwd = null, array $env = null, $timeout = 60)
     {
         $executableFinder = new PhpExecutableFinder();
         if (false === $php = $executableFinder->find(false)) {
@@ -48,11 +47,8 @@ public function __construct($script, $cwd = null, array $env = null, $timeout =
             $php[] = $file;
             $script = null;
         }
-        if (null !== $options) {
-            @trigger_error(sprintf('The $options parameter of the %s constructor is deprecated since version 3.3 and will be removed in 4.0.', __CLASS__), E_USER_DEPRECATED);
-        }
 
-        parent::__construct($php, $cwd, $env, $script, $timeout, $options);
+        parent::__construct($php, $cwd, $env, $script, $timeout);
     }
 
     /**
@@ -66,12 +62,11 @@ public function setPhpBinary($php)
     /**
      * {@inheritdoc}
      */
-    public function start(callable $callback = null/*, array $env = array()*/)
+    public function start(callable $callback = null, array $env = array())
     {
         if (null === $this->getCommandLine()) {
             throw new RuntimeException('Unable to find the PHP executable.');
         }
-        $env = 1 < func_num_args() ? func_get_arg(1) : null;
 
         parent::start($callback, $env);
     }
diff --git a/src/Symfony/Component/Process/Process.php b/src/Symfony/Component/Process/Process.php
index cf471ee592b8b..d74c38afe8850 100644
--- a/src/Symfony/Component/Process/Process.php
+++ b/src/Symfony/Component/Process/Process.php
@@ -58,7 +58,6 @@ class Process implements \IteratorAggregate
     private $lastOutputTime;
     private $timeout;
     private $idleTimeout;
-    private $options = array('suppress_errors' => true);
     private $exitcode;
     private $fallbackStatus = array();
     private $processInformation;
@@ -73,7 +72,6 @@ class Process implements \IteratorAggregate
     private $incrementalErrorOutputOffset = 0;
     private $tty;
     private $pty;
-    private $inheritEnv = false;
 
     private $useFileHandles = false;
     /** @var PipesInterface */
@@ -141,11 +139,10 @@ class Process implements \IteratorAggregate
      * @param array|null     $env         The environment variables or null to use the same environment as the current PHP process
      * @param mixed|null     $input       The input as stream resource, scalar or \Traversable, or null for no input
      * @param int|float|null $timeout     The timeout in seconds or null to disable
-     * @param array          $options     An array of options for proc_open
      *
      * @throws RuntimeException When proc_open is not installed
      */
-    public function __construct($commandline, $cwd = null, array $env = null, $input = null, $timeout = 60, array $options = null)
+    public function __construct($commandline, $cwd = null, array $env = null, $input = null, $timeout = 60)
     {
         if (!function_exists('proc_open')) {
             throw new RuntimeException('The Process class relies on proc_open, which is not available on your PHP installation.');
@@ -170,10 +167,6 @@ public function __construct($commandline, $cwd = null, array $env = null, $input
         $this->useFileHandles = '\\' === DIRECTORY_SEPARATOR;
         $this->pty = false;
         $this->enhanceSigchildCompatibility = '\\' !== DIRECTORY_SEPARATOR && $this->isSigchildEnabled();
-        if (null !== $options) {
-            @trigger_error(sprintf('The $options parameter of the %s constructor is deprecated since version 3.3 and will be removed in 4.0.', __CLASS__), E_USER_DEPRECATED);
-            $this->options = array_replace($this->options, $options);
-        }
     }
 
     public function __destruct()
@@ -208,9 +201,8 @@ public function __clone()
      *
      * @final since version 3.3
      */
-    public function run($callback = null/*, array $env = array()*/)
+    public function run($callback = null, array $env = array())
     {
-        $env = 1 < func_num_args() ? func_get_arg(1) : null;
         $this->start($callback, $env);
 
         return $this->wait();
@@ -232,12 +224,11 @@ public function run($callback = null/*, array $env = array()*/)
      *
      * @final since version 3.3
      */
-    public function mustRun(callable $callback = null/*, array $env = array()*/)
+    public function mustRun(callable $callback = null, array $env = array())
     {
         if (!$this->enhanceSigchildCompatibility && $this->isSigchildEnabled()) {
             throw new RuntimeException('This PHP has been compiled with --enable-sigchild. You must use setEnhanceSigchildCompatibility() to use this method.');
         }
-        $env = 1 < func_num_args() ? func_get_arg(1) : null;
 
         if (0 !== $this->run($callback, $env)) {
             throw new ProcessFailedException($this);
@@ -266,29 +257,17 @@ public function mustRun(callable $callback = null/*, array $env = array()*/)
      * @throws RuntimeException When process is already running
      * @throws LogicException   In case a callback is provided and output has been disabled
      */
-    public function start(callable $callback = null/*, array $env = array()*/)
+    public function start(callable $callback = null, array $env = array())
     {
         if ($this->isRunning()) {
             throw new RuntimeException('Process is already running');
         }
-        if (2 <= func_num_args()) {
-            $env = func_get_arg(1);
-        } else {
-            if (__CLASS__ !== static::class) {
-                $r = new \ReflectionMethod($this, __FUNCTION__);
-                if (__CLASS__ !== $r->getDeclaringClass()->getName() && (2 > $r->getNumberOfParameters() || 'env' !== $r->getParameters()[0]->name)) {
-                    @trigger_error(sprintf('The %s::start() method expects a second "$env" argument since version 3.3. It will be made mandatory in 4.0.', static::class), E_USER_DEPRECATED);
-                }
-            }
-            $env = null;
-        }
 
         $this->resetProcessData();
         $this->starttime = $this->lastOutputTime = microtime(true);
         $this->callback = $this->buildCallback($callback);
         $this->hasCallback = null !== $callback;
         $descriptors = $this->getDescriptors();
-        $inheritEnv = $this->inheritEnv;
 
         if (is_array($commandline = $this->commandline)) {
             $commandline = implode(' ', array_map(array($this, 'escapeArgument'), $commandline));
@@ -301,25 +280,23 @@ public function start(callable $callback = null/*, array $env = array()*/)
 
         if (null === $env) {
             $env = $this->env;
-        } else {
-            if ($this->env) {
-                $env += $this->env;
-            }
-            $inheritEnv = true;
+        } elseif ($this->env) {
+            $env += $this->env;
         }
 
         $envBackup = array();
-        if (null !== $env && $inheritEnv) {
+        if (null !== $env) {
             foreach ($env as $k => $v) {
                 $envBackup[$k] = getenv($k);
                 putenv(false === $v || null === $v ? $k : "$k=$v");
             }
             $env = null;
-        } elseif (null !== $env) {
-            @trigger_error('Not inheriting environment variables is deprecated since Symfony 3.3 and will always happen in 4.0. Set "Process::inheritEnvironmentVariables()" to true instead.', E_USER_DEPRECATED);
         }
+
+        $options = array('suppress_errors' => true);
+
         if ('\\' === DIRECTORY_SEPARATOR && $this->enhanceWindowsCompatibility) {
-            $this->options['bypass_shell'] = true;
+            $options['bypass_shell'] = true;
             $commandline = $this->prepareWindowsCommandLine($commandline, $envBackup, $env);
         } elseif (!$this->useFileHandles && $this->enhanceSigchildCompatibility && $this->isSigchildEnabled()) {
             // last exit code is output on the fourth pipe and caught to work around --enable-sigchild
@@ -334,7 +311,7 @@ public function start(callable $callback = null/*, array $env = array()*/)
             $ptsWorkaround = fopen(__FILE__, 'r');
         }
 
-        $this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $env, $this->options);
+        $this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $env, $options);
 
         foreach ($envBackup as $k => $v) {
             putenv(false === $v ? $k : "$k=$v");
@@ -375,12 +352,11 @@ public function start(callable $callback = null/*, array $env = array()*/)
      *
      * @final since version 3.3
      */
-    public function restart(callable $callback = null/*, array $env = array()*/)
+    public function restart(callable $callback = null, array $env = array())
     {
         if ($this->isRunning()) {
             throw new RuntimeException('Process is already running');
         }
-        $env = 1 < func_num_args() ? func_get_arg(1) : null;
 
         $process = clone $this;
         $process->start($callback, $env);
@@ -1178,38 +1154,6 @@ public function setInput($input)
         return $this;
     }
 
-    /**
-     * Gets the options for proc_open.
-     *
-     * @return array The current options
-     *
-     * @deprecated since version 3.3, to be removed in 4.0.
-     */
-    public function getOptions()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0.', __METHOD__), E_USER_DEPRECATED);
-
-        return $this->options;
-    }
-
-    /**
-     * Sets the options for proc_open.
-     *
-     * @param array $options The new options
-     *
-     * @return self The current Process instance
-     *
-     * @deprecated since version 3.3, to be removed in 4.0.
-     */
-    public function setOptions(array $options)
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0.', __METHOD__), E_USER_DEPRECATED);
-
-        $this->options = $options;
-
-        return $this;
-    }
-
     /**
      * Gets whether or not Windows compatibility is enabled.
      *
@@ -1290,28 +1234,12 @@ public function setEnhanceSigchildCompatibility($enhance)
     public function inheritEnvironmentVariables($inheritEnv = true)
     {
         if (!$inheritEnv) {
-            @trigger_error('Not inheriting environment variables is deprecated since Symfony 3.3 and will always happen in 4.0. Set "Process::inheritEnvironmentVariables()" to true instead.', E_USER_DEPRECATED);
+            throw new InvalidArgumentException('Not inheriting environment variables is not supported.');
         }
 
-        $this->inheritEnv = (bool) $inheritEnv;
-
         return $this;
     }
 
-    /**
-     * Returns whether environment variables will be inherited or not.
-     *
-     * @return bool
-     *
-     * @deprecated since version 3.3, to be removed in 4.0. Environment variables will always be inherited.
-     */
-    public function areEnvironmentVariablesInherited()
-    {
-        @trigger_error(sprintf('The %s() method is deprecated since version 3.3 and will be removed in 4.0. Environment variables will always be inherited.', __METHOD__), E_USER_DEPRECATED);
-
-        return $this->inheritEnv;
-    }
-
     /**
      * Performs a check between the timeout definition and the time the process started.
      *
diff --git a/src/Symfony/Component/Process/ProcessBuilder.php b/src/Symfony/Component/Process/ProcessBuilder.php
deleted file mode 100644
index 5a54689875d8e..0000000000000
--- a/src/Symfony/Component/Process/ProcessBuilder.php
+++ /dev/null
@@ -1,281 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Process;
-
-@trigger_error(sprintf('The %s class is deprecated since version 3.4 and will be removed in 4.0. Use the Process class instead.', ProcessBuilder::class), E_USER_DEPRECATED);
-
-use Symfony\Component\Process\Exception\InvalidArgumentException;
-use Symfony\Component\Process\Exception\LogicException;
-
-/**
- * Process builder.
- *
- * @author Kris Wallsmith <kris@symfony.com>
- *
- * @deprecated since version 3.4, to be removed in 4.0. Use the Process class instead.
- */
-class ProcessBuilder
-{
-    private $arguments;
-    private $cwd;
-    private $env = array();
-    private $input;
-    private $timeout = 60;
-    private $options;
-    private $inheritEnv = true;
-    private $prefix = array();
-    private $outputDisabled = false;
-
-    /**
-     * Constructor.
-     *
-     * @param string[] $arguments An array of arguments
-     */
-    public function __construct(array $arguments = array())
-    {
-        $this->arguments = $arguments;
-    }
-
-    /**
-     * Creates a process builder instance.
-     *
-     * @param string[] $arguments An array of arguments
-     *
-     * @return static
-     */
-    public static function create(array $arguments = array())
-    {
-        return new static($arguments);
-    }
-
-    /**
-     * Adds an unescaped argument to the command string.
-     *
-     * @param string $argument A command argument
-     *
-     * @return $this
-     */
-    public function add($argument)
-    {
-        $this->arguments[] = $argument;
-
-        return $this;
-    }
-
-    /**
-     * Adds a prefix to the command string.
-     *
-     * The prefix is preserved when resetting arguments.
-     *
-     * @param string|array $prefix A command prefix or an array of command prefixes
-     *
-     * @return $this
-     */
-    public function setPrefix($prefix)
-    {
-        $this->prefix = is_array($prefix) ? $prefix : array($prefix);
-
-        return $this;
-    }
-
-    /**
-     * Sets the arguments of the process.
-     *
-     * Arguments must not be escaped.
-     * Previous arguments are removed.
-     *
-     * @param string[] $arguments
-     *
-     * @return $this
-     */
-    public function setArguments(array $arguments)
-    {
-        $this->arguments = $arguments;
-
-        return $this;
-    }
-
-    /**
-     * Sets the working directory.
-     *
-     * @param null|string $cwd The working directory
-     *
-     * @return $this
-     */
-    public function setWorkingDirectory($cwd)
-    {
-        $this->cwd = $cwd;
-
-        return $this;
-    }
-
-    /**
-     * Sets whether environment variables will be inherited or not.
-     *
-     * @param bool $inheritEnv
-     *
-     * @return $this
-     */
-    public function inheritEnvironmentVariables($inheritEnv = true)
-    {
-        $this->inheritEnv = $inheritEnv;
-
-        return $this;
-    }
-
-    /**
-     * Sets an environment variable.
-     *
-     * Setting a variable overrides its previous value. Use `null` to unset a
-     * defined environment variable.
-     *
-     * @param string      $name  The variable name
-     * @param null|string $value The variable value
-     *
-     * @return $this
-     */
-    public function setEnv($name, $value)
-    {
-        $this->env[$name] = $value;
-
-        return $this;
-    }
-
-    /**
-     * Adds a set of environment variables.
-     *
-     * Already existing environment variables with the same name will be
-     * overridden by the new values passed to this method. Pass `null` to unset
-     * a variable.
-     *
-     * @param array $variables The variables
-     *
-     * @return $this
-     */
-    public function addEnvironmentVariables(array $variables)
-    {
-        $this->env = array_replace($this->env, $variables);
-
-        return $this;
-    }
-
-    /**
-     * Sets the input of the process.
-     *
-     * @param resource|scalar|\Traversable|null $input The input content
-     *
-     * @return $this
-     *
-     * @throws InvalidArgumentException In case the argument is invalid
-     */
-    public function setInput($input)
-    {
-        $this->input = ProcessUtils::validateInput(__METHOD__, $input);
-
-        return $this;
-    }
-
-    /**
-     * Sets the process timeout.
-     *
-     * To disable the timeout, set this value to null.
-     *
-     * @param float|null $timeout
-     *
-     * @return $this
-     *
-     * @throws InvalidArgumentException
-     */
-    public function setTimeout($timeout)
-    {
-        if (null === $timeout) {
-            $this->timeout = null;
-
-            return $this;
-        }
-
-        $timeout = (float) $timeout;
-
-        if ($timeout < 0) {
-            throw new InvalidArgumentException('The timeout value must be a valid positive integer or float number.');
-        }
-
-        $this->timeout = $timeout;
-
-        return $this;
-    }
-
-    /**
-     * Adds a proc_open option.
-     *
-     * @param string $name  The option name
-     * @param string $value The option value
-     *
-     * @return $this
-     */
-    public function setOption($name, $value)
-    {
-        $this->options[$name] = $value;
-
-        return $this;
-    }
-
-    /**
-     * Disables fetching output and error output from the underlying process.
-     *
-     * @return $this
-     */
-    public function disableOutput()
-    {
-        $this->outputDisabled = true;
-
-        return $this;
-    }
-
-    /**
-     * Enables fetching output and error output from the underlying process.
-     *
-     * @return $this
-     */
-    public function enableOutput()
-    {
-        $this->outputDisabled = false;
-
-        return $this;
-    }
-
-    /**
-     * Creates a Process instance and returns it.
-     *
-     * @return Process
-     *
-     * @throws LogicException In case no arguments have been provided
-     */
-    public function getProcess()
-    {
-        if (0 === count($this->prefix) && 0 === count($this->arguments)) {
-            throw new LogicException('You must add() command arguments before calling getProcess().');
-        }
-
-        $arguments = array_merge($this->prefix, $this->arguments);
-        $process = new Process($arguments, $this->cwd, $this->env, $this->input, $this->timeout, $this->options);
-
-        if ($this->inheritEnv) {
-            $process->inheritEnvironmentVariables();
-        }
-        if ($this->outputDisabled) {
-            $process->disableOutput();
-        }
-
-        return $process;
-    }
-}
diff --git a/src/Symfony/Component/Process/ProcessUtils.php b/src/Symfony/Component/Process/ProcessUtils.php
index 24438d985cad9..e0d9c08ab463f 100644
--- a/src/Symfony/Component/Process/ProcessUtils.php
+++ b/src/Symfony/Component/Process/ProcessUtils.php
@@ -29,55 +29,6 @@ private function __construct()
     {
     }
 
-    /**
-     * Escapes a string to be used as a shell argument.
-     *
-     * @param string $argument The argument that will be escaped
-     *
-     * @return string The escaped argument
-     *
-     * @deprecated since version 3.3, to be removed in 4.0. Use a command line array or give env vars to the `Process::start/run()` method instead.
-     */
-    public static function escapeArgument($argument)
-    {
-        @trigger_error('The '.__METHOD__.'() method is deprecated since version 3.3 and will be removed in 4.0. Use a command line array or give env vars to the Process::start/run() method instead.', E_USER_DEPRECATED);
-
-        //Fix for PHP bug #43784 escapeshellarg removes % from given string
-        //Fix for PHP bug #49446 escapeshellarg doesn't work on Windows
-        //@see https://bugs.php.net/bug.php?id=43784
-        //@see https://bugs.php.net/bug.php?id=49446
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            if ('' === $argument) {
-                return escapeshellarg($argument);
-            }
-
-            $escapedArgument = '';
-            $quote = false;
-            foreach (preg_split('/(")/', $argument, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE) as $part) {
-                if ('"' === $part) {
-                    $escapedArgument .= '\\"';
-                } elseif (self::isSurroundedBy($part, '%')) {
-                    // Avoid environment variable expansion
-                    $escapedArgument .= '^%"'.substr($part, 1, -1).'"^%';
-                } else {
-                    // escape trailing backslash
-                    if ('\\' === substr($part, -1)) {
-                        $part .= '\\';
-                    }
-                    $quote = true;
-                    $escapedArgument .= $part;
-                }
-            }
-            if ($quote) {
-                $escapedArgument = '"'.$escapedArgument.'"';
-            }
-
-            return $escapedArgument;
-        }
-
-        return "'".str_replace("'", "'\\''", $argument)."'";
-    }
-
     /**
      * Validates and normalizes a Process input.
      *
@@ -115,9 +66,4 @@ public static function validateInput($caller, $input)
 
         return $input;
     }
-
-    private static function isSurroundedBy($arg, $char)
-    {
-        return 2 < strlen($arg) && $char === $arg[0] && $char === $arg[strlen($arg) - 1];
-    }
 }
diff --git a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php b/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
deleted file mode 100644
index c1a67afa18bbb..0000000000000
--- a/src/Symfony/Component/Process/Tests/ProcessBuilderTest.php
+++ /dev/null
@@ -1,213 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Process\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Process\ProcessBuilder;
-
-/**
- * @group legacy
- */
-class ProcessBuilderTest extends TestCase
-{
-    public function testInheritEnvironmentVars()
-    {
-        $proc = ProcessBuilder::create()
-            ->add('foo')
-            ->getProcess();
-
-        $this->assertTrue($proc->areEnvironmentVariablesInherited());
-
-        $proc = ProcessBuilder::create()
-            ->add('foo')
-            ->inheritEnvironmentVariables(false)
-            ->getProcess();
-
-        $this->assertFalse($proc->areEnvironmentVariablesInherited());
-    }
-
-    public function testAddEnvironmentVariables()
-    {
-        $pb = new ProcessBuilder();
-        $env = array(
-            'foo' => 'bar',
-            'foo2' => 'bar2',
-        );
-        $proc = $pb
-            ->add('command')
-            ->setEnv('foo', 'bar2')
-            ->addEnvironmentVariables($env)
-            ->getProcess()
-        ;
-
-        $this->assertSame($env, $proc->getEnv());
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Process\Exception\InvalidArgumentException
-     */
-    public function testNegativeTimeoutFromSetter()
-    {
-        $pb = new ProcessBuilder();
-        $pb->setTimeout(-1);
-    }
-
-    public function testNullTimeout()
-    {
-        $pb = new ProcessBuilder();
-        $pb->setTimeout(10);
-        $pb->setTimeout(null);
-
-        $r = new \ReflectionObject($pb);
-        $p = $r->getProperty('timeout');
-        $p->setAccessible(true);
-
-        $this->assertNull($p->getValue($pb));
-    }
-
-    public function testShouldSetArguments()
-    {
-        $pb = new ProcessBuilder(array('initial'));
-        $pb->setArguments(array('second'));
-
-        $proc = $pb->getProcess();
-
-        $this->assertContains('second', $proc->getCommandLine());
-    }
-
-    public function testPrefixIsPrependedToAllGeneratedProcess()
-    {
-        $pb = new ProcessBuilder();
-        $pb->setPrefix('/usr/bin/php');
-
-        $proc = $pb->setArguments(array('-v'))->getProcess();
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php" -v', $proc->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php' '-v'", $proc->getCommandLine());
-        }
-
-        $proc = $pb->setArguments(array('-i'))->getProcess();
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php" -i', $proc->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php' '-i'", $proc->getCommandLine());
-        }
-    }
-
-    public function testArrayPrefixesArePrependedToAllGeneratedProcess()
-    {
-        $pb = new ProcessBuilder();
-        $pb->setPrefix(array('/usr/bin/php', 'composer.phar'));
-
-        $proc = $pb->setArguments(array('-v'))->getProcess();
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php" composer.phar -v', $proc->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php' 'composer.phar' '-v'", $proc->getCommandLine());
-        }
-
-        $proc = $pb->setArguments(array('-i'))->getProcess();
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php" composer.phar -i', $proc->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php' 'composer.phar' '-i'", $proc->getCommandLine());
-        }
-    }
-
-    public function testShouldEscapeArguments()
-    {
-        $pb = new ProcessBuilder(array('%path%', 'foo " bar', '%baz%baz'));
-        $proc = $pb->getProcess();
-
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertSame('""^%"path"^%"" "foo "" bar" ""^%"baz"^%"baz"', $proc->getCommandLine());
-        } else {
-            $this->assertSame("'%path%' 'foo \" bar' '%baz%baz'", $proc->getCommandLine());
-        }
-    }
-
-    public function testShouldEscapeArgumentsAndPrefix()
-    {
-        $pb = new ProcessBuilder(array('arg'));
-        $pb->setPrefix('%prefix%');
-        $proc = $pb->getProcess();
-
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertSame('""^%"prefix"^%"" arg', $proc->getCommandLine());
-        } else {
-            $this->assertSame("'%prefix%' 'arg'", $proc->getCommandLine());
-        }
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Process\Exception\LogicException
-     */
-    public function testShouldThrowALogicExceptionIfNoPrefixAndNoArgument()
-    {
-        ProcessBuilder::create()->getProcess();
-    }
-
-    public function testShouldNotThrowALogicExceptionIfNoArgument()
-    {
-        $process = ProcessBuilder::create()
-            ->setPrefix('/usr/bin/php')
-            ->getProcess();
-
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php"', $process->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php'", $process->getCommandLine());
-        }
-    }
-
-    public function testShouldNotThrowALogicExceptionIfNoPrefix()
-    {
-        $process = ProcessBuilder::create(array('/usr/bin/php'))
-            ->getProcess();
-
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            $this->assertEquals('"/usr/bin/php"', $process->getCommandLine());
-        } else {
-            $this->assertEquals("'/usr/bin/php'", $process->getCommandLine());
-        }
-    }
-
-    public function testShouldReturnProcessWithDisabledOutput()
-    {
-        $process = ProcessBuilder::create(array('/usr/bin/php'))
-            ->disableOutput()
-            ->getProcess();
-
-        $this->assertTrue($process->isOutputDisabled());
-    }
-
-    public function testShouldReturnProcessWithEnabledOutput()
-    {
-        $process = ProcessBuilder::create(array('/usr/bin/php'))
-            ->disableOutput()
-            ->enableOutput()
-            ->getProcess();
-
-        $this->assertFalse($process->isOutputDisabled());
-    }
-
-    /**
-     * @expectedException \Symfony\Component\Process\Exception\InvalidArgumentException
-     * @expectedExceptionMessage Symfony\Component\Process\ProcessBuilder::setInput only accepts strings, Traversable objects or stream resources.
-     */
-    public function testInvalidInput()
-    {
-        $builder = ProcessBuilder::create();
-        $builder->setInput(array());
-    }
-}
diff --git a/src/Symfony/Component/Process/Tests/ProcessTest.php b/src/Symfony/Component/Process/Tests/ProcessTest.php
index ade11138e3b60..1297e82381b6f 100644
--- a/src/Symfony/Component/Process/Tests/ProcessTest.php
+++ b/src/Symfony/Component/Process/Tests/ProcessTest.php
@@ -1425,27 +1425,6 @@ public function testEnvIsInherited()
         $this->assertEquals($expected, $env);
     }
 
-    /**
-     * @group legacy
-     */
-    public function testInheritEnvDisabled()
-    {
-        $process = $this->getProcessForCode('echo serialize($_SERVER);', null, array('BAR' => 'BAZ'));
-
-        putenv('FOO=BAR');
-
-        $this->assertSame($process, $process->inheritEnvironmentVariables(false));
-        $this->assertFalse($process->areEnvironmentVariablesInherited());
-
-        $process->run();
-
-        $expected = array('BAR' => 'BAZ', 'FOO' => 'BAR');
-        $env = array_intersect_key(unserialize($process->getOutput()), $expected);
-        unset($expected['FOO']);
-
-        $this->assertSame($expected, $env);
-    }
-
     public function testGetCommandLine()
     {
         $p = new Process(array('/usr/bin/php'));
@@ -1465,19 +1444,6 @@ public function testEscapeArgument($arg)
         $this->assertSame($arg, $p->getOutput());
     }
 
-    /**
-     * @dataProvider provideEscapeArgument
-     * @group legacy
-     */
-    public function testEscapeArgumentWhenInheritEnvDisabled($arg)
-    {
-        $p = new Process(array(self::$phpBin, '-r', 'echo $argv[1];', $arg), null, array('BAR' => 'BAZ'));
-        $p->inheritEnvironmentVariables(false);
-        $p->run();
-
-        $this->assertSame($arg, $p->getOutput());
-    }
-
     public function provideEscapeArgument()
     {
         yield array('a"b%c%');
diff --git a/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php b/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php
deleted file mode 100644
index 82fd8cfa8c898..0000000000000
--- a/src/Symfony/Component/Process/Tests/ProcessUtilsTest.php
+++ /dev/null
@@ -1,53 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\Process\Tests;
-
-use PHPUnit\Framework\TestCase;
-use Symfony\Component\Process\ProcessUtils;
-
-/**
- * @group legacy
- */
-class ProcessUtilsTest extends TestCase
-{
-    /**
-     * @dataProvider dataArguments
-     */
-    public function testEscapeArgument($result, $argument)
-    {
-        $this->assertSame($result, ProcessUtils::escapeArgument($argument));
-    }
-
-    public function dataArguments()
-    {
-        if ('\\' === DIRECTORY_SEPARATOR) {
-            return array(
-                array('"\"php\" \"-v\""', '"php" "-v"'),
-                array('"foo bar"', 'foo bar'),
-                array('^%"path"^%', '%path%'),
-                array('"<|>\\" \\"\'f"', '<|>" "\'f'),
-                array('""', ''),
-                array('"with\trailingbs\\\\"', 'with\trailingbs\\'),
-            );
-        }
-
-        return array(
-            array("'\"php\" \"-v\"'", '"php" "-v"'),
-            array("'foo bar'", 'foo bar'),
-            array("'%path%'", '%path%'),
-            array("'<|>\" \"'\\''f'", '<|>" "\'f'),
-            array("''", ''),
-            array("'with\\trailingbs\\'", 'with\trailingbs\\'),
-            array("'withNonAsciiAccentLikeéÉèÈàÀöä'", 'withNonAsciiAccentLikeéÉèÈàÀöä'),
-        );
-    }
-}