merged branch jakzal/dumpfile-tests (PR #7801)

This PR was merged into the master branch.

Discussion
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[Filesystem] Added a missing test case for Filesystem::dumpFile()

This PR adds a test case for the ``Filesystem::dumpFile()`` method (introduced in #7753).

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | [![Build Status](https://travis-ci.org/jakzal/symfony.png?branch=dumpfile-tests)](https://travis-ci.org/jakzal/symfony)
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
-------

8fcf4c2 [Filesystem] Added a missing test case for Filesystem::dumpFile().

src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

@@ -883,6 +883,17 @@ class FilesystemTest extends \PHPUnit_Framework_TestCase
         );
     }
 
+    public function testDumpFile()
+    {
+        $filename = $this->workspace.DIRECTORY_SEPARATOR.'foo'.DIRECTORY_SEPARATOR.'baz.txt';
+
+        $this->filesystem->dumpFile($filename, 'bar', 0753);
+
+        $this->assertFileExists($filename);
+        $this->assertSame('bar', file_get_contents($filename));
+        $this->assertEquals(753, $this->getFilePermissions($filename));
+    }
+
     /**
      * Returns file permissions as three digits (i.e. 755)
      *