public function testDataTypeDefinitions_onlySomeDataTypesEnabled()
 {
     $definitions = $this->getDefinitions();
     $defs = new DataTypeDefinitions($definitions, array('bar'));
     $this->assertSame(array('foo'), $defs->getTypeIds(), 'data type ids');
     $this->assertSame(array('VT:FOO' => 'DataTypeDefinitionsTest::getFooValueFormatter'), $defs->getFormatterFactoryCallbacks(DataTypeDefinitions::PREFIXED_MODE), 'formatter factory callbacks, prefixed mode');
 }