public function hasCacheReturnsCorrectResult()
{
$cache1 = $this->getMockBuilder(Cache\Frontend\AbstractFrontend::class)->disableOriginalConstructor()->getMock();
$cache1->expects($this->atLeastOnce())->method('getIdentifier')->will($this->returnValue('cache1'));
$this->cacheManager->registerCache($cache1);
$this->assertTrue($this->cacheManager->hasCache('cache1'), 'hasCache() did not return TRUE.');
$this->assertFalse($this->cacheManager->hasCache('cache2'), 'hasCache() did not return FALSE.');
}