XCTest quiz

Test your XCTest knowledge with a free interactive quiz — 20 questions with answers and explanations. No signup needed to play.

What is XCTest?

1. What is XCTest?
2. What is `XCTUnwrap` used for, and what problem does it solve compared to force-unwrapping an optional directly?
3. What does `XCTAssertEqual` do?
4. What is the purpose of code coverage reporting, as integrated with XCTest in Xcode?
5. How do you define a test case in XCTest?
6. What is `measure { }` used for in an XCTest performance test?
7. What is a common pattern for structuring an individual XCTest test method, sometimes referred to as "Arrange-Act-Assert" (or "Given-When-Then")?
8. How does XCTest handle testing asynchronous code, such as a network request completion handler?
9. What is the distinction between an XCTest "unit test" and a "UI test" (XCUITest)?
10. What does `XCTAssertNil` and `XCTAssertNotNil` check, and why might using them be preferable to a manual `if` statement with `XCTFail`?
11. How does XCTest handle running tests from the command line, outside of the Xcode IDE (e.g. as part of a CI pipeline)?
12. What is the significance of writing tests as part of the same Xcode project/workspace as the application code, using a dedicated test target?

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