GitWrapper\Test\GitWorkingCopyTest::testGitDiff PHP Method

    public function testGitDiff()
    {
        $git = $this->getWorkingCopy();
        file_put_contents(self::WORKING_DIR . '/change.me', "changed\n");
        $output = (string) $git->diff();
        $this->assertTrue(strpos($output, 'diff --git a/change.me b/change.me') === 0);
    }