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‎src/Symfony/Component/Process/Process.php‎
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‎src/Symfony/Component/Process/Tests/ProcessTest.php‎
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‎src/Symfony/Component/Process/Tests/ProcessTest.php‎
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@@ -210,6 +210,8 @@ Process
  * The `Symfony\Component\Process\ProcessBuilder` class has been deprecated,
    use the `Symfony\Component\Process\Process` class directly instead.
 
+ * Calling `Process::start()` without setting a valid working directory (via `setWorkingDirectory()` or constructor) beforehand is deprecated and will throw an exception in 4.0.
+
 Profiler
 --------
 
 
@@ -567,6 +567,8 @@ Ldap
 Process
 -------
 
+ * Passing a not existing working directory to the constructor of the `Symfony\Component\Process\Process` class is not supported anymore.
+
  * The `Symfony\Component\Process\ProcessBuilder` class has been removed,
    use the `Symfony\Component\Process\Process` class directly instead.
 
 
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * deprecated the ProcessBuilder class
+ * deprecated calling `Process::start()` without setting a valid working directory beforehand (via `setWorkingDirectory()` or constructor)
 
 3.3.0
 -----
 
@@ -334,6 +334,14 @@ public function start(callable $callback = null/*, array $env = array()*/)
             $ptsWorkaround = fopen(__FILE__, 'r');
         }
 
+        if (!is_dir($this->cwd)) {
+            if ('\\' === DIRECTORY_SEPARATOR) {
+                throw new RuntimeException('The provided cwd does not exist.');
+            }
+
+            @trigger_error('The provided cwd does not exist. Command is currently ran against getcwd(). This behavior is deprecated since version 3.4 and will be removed in 4.0.', E_USER_DEPRECATED);
+        }
+
         $this->process = proc_open($commandline, $descriptors, $this->processPipes->pipes, $this->cwd, $env, $this->options);
 
         foreach ($envBackup as $k => $v) {
@@ -831,7 +839,7 @@ public function isRunning()
      */
     public function isStarted()
     {
-        return $this->status != self::STATUS_READY;
+        return self::STATUS_READY != $this->status;
     }
 
     /**
@@ -843,7 +851,7 @@ public function isTerminated()
     {
         $this->updateStatus(false);
 
-        return $this->status == self::STATUS_TERMINATED;
+        return self::STATUS_TERMINATED == $this->status;
     }
 
     /**
@@ -1322,7 +1330,7 @@ public function areEnvironmentVariablesInherited()
      */
     public function checkTimeout()
     {
-        if ($this->status !== self::STATUS_STARTED) {
+        if (self::STATUS_STARTED !== $this->status) {
             return;
         }
 
@@ -1513,7 +1521,7 @@ private function readPipes($blocking, $close)
         $callback = $this->callback;
         foreach ($result as $type => $data) {
             if (3 !== $type) {
-                $callback($type === self::STDOUT ? self::OUT : self::ERR, $data);
+                $callback(self::STDOUT === $type ? self::OUT : self::ERR, $data);
             } elseif (!isset($this->fallbackStatus['signaled'])) {
                 $this->fallbackStatus['exitcode'] = (int) $data;
             }
 
@@ -48,6 +48,46 @@ protected function tearDown()
         }
     }
 
+    /**
+     * @group legacy
+     * @expectedDeprecation The provided cwd does not exist. Command is currently ran against getcwd(). This behavior is deprecated since version 3.4 and will be removed in 4.0.
+     */
+    public function testInvalidCwd()
+    {
+        if ('\\' === DIRECTORY_SEPARATOR) {
+            $this->markTestSkipped('Windows handles this automatically.');
+        }
+
+        // Check that it works fine if the CWD exists
+        $cmd = new Process('echo test', __DIR__);
+        $cmd->run();
+
+        $cmd = new Process('echo test', __DIR__.'/notfound/');
+        $cmd->run();
+    }
+
+    /**
+     * @expectedException \Symfony\Component\Process\Exception\RuntimeException
+     * @expectedExceptionMessage The provided cwd does not exist.
+     */
+    public function testInvalidCwdOnWindows()
+    {
+        if ('\\' !== DIRECTORY_SEPARATOR) {
+            $this->markTestSkipped('Unix handles this automatically.');
+        }
+
+        try {
+            // Check that it works fine if the CWD exists
+            $cmd = new Process('echo test', __DIR__);
+            $cmd->run();
+        } catch (\Exception $e) {
+            $this->fail($e);
+        }
+
+        $cmd = new Process('echo test', __DIR__.'/notfound/');
+        $cmd->run();
+    }
+
     public function testThatProcessDoesNotThrowWarningDuringRun()
     {
         if ('\\' === DIRECTORY_SEPARATOR) {
@@ -313,7 +353,7 @@ public function testCallbackIsExecutedForOutput()
 
         $called = false;
         $p->run(function ($type, $buffer) use (&$called) {
-            $called = $buffer === 'foo';
+            $called = 'foo' === $buffer;
         });
 
         $this->assertTrue($called, 'The callback should be executed with the output');
@@ -326,7 +366,7 @@ public function testCallbackIsExecutedForOutputWheneverOutputIsDisabled()
 
         $called = false;
         $p->run(function ($type, $buffer) use (&$called) {
-            $called = $buffer === 'foo';
+            $called = 'foo' === $buffer;
         });
 
         $this->assertTrue($called, 'The callback should be executed with the output');