public function validEntryIdentifierValues() { $mockCacheAware = $this->createMock(CacheAwareInterface::class); return array('string value' => array(array('foo' => 'Bar')), 'boolean value' => array(array('foo' => true)), 'integer value' => array(array('foo' => 42)), 'object implementing CacheAwareInterface' => array(array('foo' => $mockCacheAware)), 'null' => array(array('foo' => null))); }