# XCTAssertEqual(_:_:_:file:line:) Asserts that two values are equal. ``` func XCTAssertEqual(_ expression1: @autoclosure () throws -> T, _ expression2: @autoclosure () throws -> T, _ message: @autoclosure () -> String = "", file: StaticString = #filePath, line: UInt = #line) where T : Equatable ``` ## Parameters `expression1` An expression of type `T`, where `T` is `Equatable`. `expression2` A second expression of type `T`, where `T` is `Equatable`. `message` An optional description of a failure. `file` The file where the failure occurs. The default is the filename of the test case where you call this function. `line` The line number where the failure occurs. The default is the line number where you call this function. ## Discussion Use this function to compare two non-optional values of the same type. Listing 1. Comparing Non-Optional Values Of The Same Type ```objc class FrameSizeTests: XCTestCase { func testInitialFrameSize() { let view = CustomView() let expectedSize = CGSize(width: 640.0, height: 480.0) XCTAssertEqual(view.frame.size, expectedSize, "Unexpected frame size.") } } ``` Listing 1 creates a new instance of a custom class called `CustomView`, and checks that its size is equal to `CGSize(width: 640.0, height: 480.0)`. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)