public function testCreateSlotWithEmptyDiff() { $this->cache->expects($this->never())->method('save'); $this->compositePropertyTableDiffIterator->expects($this->once())->method('getOrderedDiffByTable')->will($this->returnValue(array())); $instance = new TransitionalDiffStore($this->cache); $this->assertNull($instance->createSlotFrom($this->compositePropertyTableDiffIterator)); }