public function hasReturnsResultFromBackend()
{
$backend = $this->prepareDefaultBackend();
$backend->expects($this->once())->method('has')->with($this->equalTo('VariableCacheTest'))->will($this->returnValue(true));
$cache = new VariableFrontend('VariableFrontend', $backend);
$this->assertTrue($cache->has('VariableCacheTest'), 'has() did not return TRUE.');
}