Bart\Git\CommitTest::testRawFileContentsReal PHP Method

    public function testRawFileContentsReal()
    {
        // Let's make sure the command we're running is legit
        $expectedContents = trim(shell_exec('git show HEAD:composer.json'));
        // Replicate the actual shell invocation that would take place
        Diesel::registerInstantiator('Bart\\Shell\\Command', function () {
            $shell = new Shell();
            $args = func_get_args();
            return call_user_func_array([$shell, 'command'], $args);
        });
        $commit = new Commit(new GitRoot(BART_DIR . '/.git'), 'HEAD');
        $actualContents = trim($commit->rawFileContents('composer.json'));
        $this->assertEquals($expectedContents, $actualContents, 'Raw file contents');
    }