Testing in Swift - SwiftSummit 2015

Transcript

1. Testing in Swift @jriehn - Jan Riehn
3. import XCTest class SummitTest: XCTestCase { override func setUp() { super.setUp() } override func tearDown() { super.tearDown() } func testExample() { XCTAssert(true, "Pass") } func testPerformanceExample() { self.measureBlock() { } } }
4. functional touches.
5. let url = NSURL(string: "http:/swiftsummit.com")! let task = NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in // process response } task.resume()
6. func testShouldReceiveDataFromSwiftSummit() { //given let url = NSURL(string: "http:/swiftsummit.com")! var expectation = expectationWithDescription(“should receive data”) var dataReceived: NSData? = nil //when let task = NSURLSession.sharedSession().dataTaskWithURL(url) {(data, response, error) in dataReceived = data expectation.fulfill() } task.resume() waitForExpectationsWithTimeout(5, handler: nil) //then XCTAssertNotNil(dataReceived, "should receive data”) }
7. where is the reflection?
8. func reflect<T>(x: T) -> MirrorType
9. /// A protocol that produces a reflection interface for a value. protocol Reflectable { /// Get the mirror that reflects this object. func getMirror() -> Mirror } protocol MirrorType { /// Copy the value out as an Any. var value: Any { get } /// Get the type of the value. var valueType: Any.Type { get } /// Get the number of logical children this value has. var count: Int { get } ... }
10. “There is nothing new except what has been forgotten.”
11. lessons learned.
12. being beyond mocking frameworks.
13. but wait, what about OCMock?
14. @objc protocol Connection { func fetchData() -> String } class ServerConnection : NSObject, Connection { func fetchData() -> String { return "real data returned from other system" } }
15. - (void)testMockingAnObject { id mock = OCMClassMock([ServerConnection class]); OCMStub([mock fetchData]).andReturn(@"stubbed!"); Controller *controller = [Controller newController]; controller.connection = mock; [controller redisplay]; OCMVerify([mock fetchData]); XCTAssertEqualObjects(@"stubbed!", controller.data, @"Excpected stubbed data."); }
16. the test setup is the key to success.
17. separate the pure from the impure and stateful.
18. force yourself to red tests.
19. func testShouldReceiveDataFromSwiftSummit() { //given let url = NSURL(string: "http:/swiftsummit.com")! var dataReceived: NSData? = nil //when let task = NSURLSession.sharedSession().dataTaskWithURL(url) {(data, response, error) in //then XCTAssertTrue(false) } task.resume() }
20. compile times.
22. frameworks.
23. Hamcrest.
24. assertThat(x, equalTo(2)) // assertThat(x, equalTo(3)) // GOT: 2, EXPECTED: equal to 3 assertThat("foobarbaz", containsString("bar")) // assertThat("foobarbaz", containsString("bla")) // GOT: "foobarbaz", EXPECTED: contains "bla" let array = ["foo", "bar"] assertThat(array, hasCount(2)) // assertThat(array, contains("foo", "bar")) // assertThat(array, contains(equalTo("foo"), equalTo("bar"))) // assertThat(array, contains(equalTo("foo"))) // GOT: [foo, bar] (unmatched item "bar"), // EXPECTED: a sequence containing equal to foo var optional: Int = 1 + 1 assertThat(optional, present()) // assertThat(optional, nilValue()) // GOT: Optional(2), EXPECTED: nil
25. UIAutomation.
27. the future of testing.
28. testing was never hard, just ugly!
29. jriehn/testing-in-swift