How to test equality with a tolerance in Swift Testing

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Created Nov ’24

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So I can see from the documentation that XCTAssertEqual(x, y) becomes #expect(x == y), but what about XCTAssertEqual(x, y, accuracy: 0.2)?

Does something already exist or do we need to write a more involved statement to see if x is less than y plus z and more than y minus z?

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Answer 1

May ’25

According to Github, the best way is to use isApproximatelyEqual(_:absoluteTolerance:) from the package swift-numerics:

#expect(someFloatingPointNumber.isApproximatelyEqual(0, absoluteTolerance: 0.001))

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