XCTest supports the following assertions. This list is essentially the same as the list of assertions supported by SenTestingKit, but with the “ST” prefix changed to “XCT”.

• XCTFail (format…)
• XCTAssertNil (a1, format…)
• XCTAssertNotNil (a1, format…)
• XCTAssert (a1, format…)
• XCTAssertTrue (a1, format…)
• XCTAssertFalse (a1, format…)
• XCTAssertEqualObjects (a1, a2, format…)
• XCTAssertEquals (a1, a2, format…)
• XCTAssertEqualsWithAccuracy (a1, a2, accuracy, format…)
• XCTAssertThrows (expression, format…)
• XCTAssertThrowsSpecific (expression, specificException, format…)
• XCTAssertThrowsSpecificNamed (expression, specificException, exceptionName, format…)
• XCTAssertNoThrow (expression, format…)
• XCTAssertNoThrowSpecific (expression, specificException, format…)
• XCTAssertNoThrowSpecificNamed (expression, specificExcepton, exceptionName, format…)

Refer to XCTestAssertions.h. The easiest way to locate this file is to Ctrl+Click on an assertion (such as “STFail”), and select “Jump to Definition”.