Sample iOS Unit Tests: Working with a ViewController composed of CollectionViews

Sample iOS Unit Tests: Working with a ViewController composed of CollectionViews

class ViewControllerTest: XCTestCase {

    var systemUnderTest: ViewController!
    
    override func setUp() {
        
        super.setUp()
        
        //get the storyboard the ViewController under test is inside
        let storyboard: UIStoryboard = UIStoryboard(name: "Main_iPhone", bundle: nil)
        
        //get the ViewController we want to test from the storyboard (note the identifier is the id explicitly set in the identity inspector)
        systemUnderTest = storyboard.instantiateViewControllerWithIdentifier("ViewController") as! ViewController
        
        //load view hierarchy
        _ = systemUnderTest.view
    }
    
    override func tearDown() {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
        super.tearDown()
    }
    
    func testSUT_CanInstantiateViewController() {
        
        XCTAssertNotNil(systemUnderTest)
    }
    
    func testSUT_CollectionViewIsNotNilAfterViewDidLoad() {
        
        XCTAssertNotNil(systemUnderTest.collectionView)
    }
    
    func testSUT_HasItemsForCollectionView() {
        
        XCTAssertNotNil(systemUnderTest.items)
    }
    
    func testSUT_ShouldSetCollectionViewDataSource() {
        
        XCTAssertNotNil(systemUnderTest.collectionView.dataSource)
    }
    
    func testSUT_ConformsToCollectionViewDataSource() {
        
        XCTAssert(systemUnderTest.conformsToProtocol(UICollectionViewDataSource))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:numberOfItemsInSection:))))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:cellForItemAtIndexPath:))))
    }
    
    func testSUT_ShouldSetCollectionViewDelegate() {
        
        XCTAssertNotNil(systemUnderTest.collectionView.delegate)
    }
    
    func testSUT_ConformsToCollectionViewDelegate() {
        
        XCTAssert(systemUnderTest.conformsToProtocol(UICollectionViewDelegate))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:didSelectItemAtIndexPath:))))
    }
    
    func testSUT_ConformsToCollectionViewDelegateFlowLayout () {
     
        XCTAssert(self.systemUnderTest.conformsToProtocol(UICollectionViewDelegateFlowLayout))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:layout:sizeForItemAtIndexPath:))))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:layout:insetForSectionAtIndex:))))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:layout:minimumLineSpacingForSectionAtIndex:))))
        XCTAssertTrue(systemUnderTest.respondsToSelector(#selector(systemUnderTest.collectionView(_:layout:minimumInteritemSpacingForSectionAtIndex:))))
    }
}