public function testSumValues() { $collection = new Collection(); //Add fake items to collection $model1 = Mockery::mock('Mookofe\\LaravelSupport\\Model'); $model2 = Mockery::mock('Mookofe\\LaravelSupport\\Model'); $model1->shouldReceive('delete')->once()->andReturn(null); $model2->shouldReceive('delete')->once()->andReturn(null); $collection->add($model1); $collection->add($model2); //Delete items $collection->delete(); }