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iOSUnitTestingCheatSheet.md

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iOSUnitTesting

D'oh!

Did you, by any chance, name your test method text_something instead of test_something?

Concepts

  • FIRST
    • fast
    • isolated
    • repeatable
    • self-verifying
    • timely
  • AAA
    • Arrange
    • Act
    • Assert
  • FIRE
    • Fast
    • Isolated
    • Repeatable
    • Easy to test

CustomStringConvertible

Implement CustomStringConvertible protocol and add a "description" method.

Asserts

  • class XCTest
  • func XCTAssert(() -> Bool, () -> String, file: StaticString, line: UInt)
  • func XCTAssertTrue(() -> Bool, () -> String, file: StaticString, line: UInt)
  • func XCTAssertFalse(() -> Bool, () -> String, file: StaticString, line: UInt)
  • func XCTAssertNil(() -> Any?, () -> String, file: StaticString, line: UInt)
  • func XCTAssertNotNil(() -> Any?, () -> String, file: StaticString, line: UInt)
  • func XCTUnwrap<T>(() -> T?, () -> String, file: StaticString, line: UInt) -> T
  • func XCTAssertEqual<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertNotEqual<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertIdentical(() -> AnyObject?, () -> AnyObject?, () -> String, file: StaticString, line: UInt)
  • func XCTAssertNotIdentical(() -> AnyObject?, () -> AnyObject?, () -> String, file: StaticString, line: UInt)
  • func XCTAssertEqual<T>(() -> T, () -> T, accuracy: T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertNotEqual<T>(() -> T, () -> T, accuracy: T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertGreaterThan<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertGreaterThanOrEqual<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertLessThanOrEqual<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertLessThan<T>(() -> T, () -> T, () -> String, file: StaticString, line: UInt)
  • func XCTAssertThrowsError<T>(() -> T, () -> String, file: StaticString, line: UInt, (Error) -> Void)
  • func XCTAssertNoThrow<T>(() -> T, () -> String, file: StaticString, line: UInt)
  • func XCTFail(String, file: StaticString, line: UInt)
  • func XCTExpectFailure(String?, options: XCTExpectedFailure.Options)
  • func XCTExpectFailure(String?, enabled: Bool?, strict: Bool?, issueMatcher: ((XCTIssue) -> Bool)?)
  • func XCTExpectFailure<R>(String?, options: XCTExpectedFailure.Options, failingBlock: () -> R) -> R
  • func XCTExpectFailure<R>(String?, enabled: Bool?, strict: Bool?, failingBlock: () -> R, issueMatcher: ((XCTIssue) -> Bool)?) -> R
  • func XCTSkipIf(() -> Bool, () -> String?, file: StaticString, line: UInt)
  • func XCTSkipUnless(() -> Bool, () -> String?, file: StaticString, line: UInt)
  • throw XCTSkip("Reason for skipping.")

Testing a class

@testable import AppTarget

class MyClassTests: XCTestCase {
    func test_methodOne() {
    }
}

Testing View Controllers

loadViewIfNeeded()

Tips

Turn off debugging for unit tests to speed up.