Promote the Test Spy into a Mock Object
Our test case makes two assertions against the test spy:
| | XCTAssertEqual(mockURLSession.dataTaskCallCount, 1, "call count") |
| | XCTAssertEqual( |
| | mockURLSession.dataTaskArgsRequest.first, |
| | URLRequest(url: URL(string: "https://itunes.apple.com/search?" + |
| | "media=ebook&term=out%20from%20boneville")!), |
| | "request") |
It’s saying, “Confirm that system under test called the dataTask method once, with this request as the argument.” Let’s get a sense for how these assertions report failures. Go to the production code for the button tap action:
| | @IBAction private func buttonTapped ... |
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