/**
     * @test
     */
    public function saveStoresFormDefinitionAsYaml()
    {
        $mockArrayFormDefinition = array('type' => 'TYPO3.Form:Form', 'identifier' => 'formFixture', 'label' => 'Form Fixture');
        $this->assertFalse(vfsStreamWrapper::getRoot()->hasChild('mockFormPersistenceIdentifier.yaml'));
        $this->yamlPersistenceManager->save('mockFormPersistenceIdentifier', $mockArrayFormDefinition);
        $expectedResult = 'type: \'TYPO3.Form:Form\'
identifier: formFixture
label: \'Form Fixture\'
';
        $actualResult = file_get_contents(vfsStream::url('someSavePath/mockFormPersistenceIdentifier.yaml'));
        $this->assertEquals($expectedResult, $actualResult);
    }