attempts to fix tests on Travis

Author: schmittjoh

src/Symfony/Component/Process/Process.php

@@ -120,6 +120,27 @@ class Process
         159 => 'Bad syscall',
     );
 
+    /**
+     * Returns whether PTY is supported on the current operating system.
+     *
+     * @return Boolean
+     */
+    public static function isPtySupported()
+    {
+        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
+            return false;
+        }
+
+        $proc = @proc_open('echo 1', array(array('pty'), array('pty'), array('pty')), $pipes);
+        if (is_resource($proc)) {
+            proc_close($proc);
+
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * Constructor.
      *
@@ -1183,7 +1204,7 @@ private function getDescriptors()
                 array('file', '/dev/tty', 'w'),
                 array('file', '/dev/tty', 'w'),
             );
-        } elseif ($this->pty) {
+        } elseif ($this->pty && self::isPtySupported()) {
             $descriptors = array(
                 array('pty'),
                 array('pty'),

src/Symfony/Component/Process/Tests/AbstractProcessTest.php

@@ -205,8 +205,8 @@ public function testTTYCommand()
      */
     public function testPTYCommand()
     {
-        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
-            $this->markTestSkipped('Windows does not have PTY support.');
+        if ( ! Process::isPtySupported()) {
+            $this->markTestSkipped('PTY is not supported on this operating system.');
         }
 
         $process = $this->getProcess('echo "foo"');