ytyubox / difference

Simple way to identify what is different between 2 instances of any type. Must have for TDD.

Difference

Better way to identify what's different between 2 instances.

Have you ever written tests? Usually they use equality asserts, e.g. XCTAssertEqual, what happens if the objects aren't equal? Xcode throws a wall of text at you:

This forces you to manually scan the text and try to figure out exactly whats wrong, what if instead you could just learn which property is different?

Installation

CocoaPods

Add pod 'Difference' to your Podfile.

Carthage

Add github "krzysztofzablocki/Difference" to your Cartfile.

SwiftPM

Add .package(name: "Difference", url: "https://github.com/krzysztofzablocki/Difference.git", .branch("master")), dependency in your Package manifest.

Using lldb

Write the following to see the difference between 2 instances:

po dumpDiff(expected, received)

Integrate with XCTest

Add this to your test target:

public func XCTAssertEqual<T: Equatable>(_ expected: @autoclosure () throws -> T, _ received: @autoclosure () throws -> T, file: StaticString = #filePath, line: UInt = #line) {
    do {
        let expected = try expected()
        let received = try received()
        XCTAssertTrue(expected == received, "Found difference for \n" + diff(expected, received).joined(separator: ", "), file: file, line: line)
    }
    catch {
        XCTFail("Caught error while testing: \(error)", file: file, line: line)
    }
}

Replace #filePath with #file if you're using Xcode 11 or earlier.

Integrate with Quick

Add this to your test target:

public func equalDiff<T: Equatable>(_ expectedValue: T?) -> Predicate<T> {
    return Predicate.define { actualExpression in
        let receivedValue = try actualExpression.evaluate()

        if receivedValue == nil {
            var message = ExpectationMessage.fail("")
            if let expectedValue = expectedValue {
                message = ExpectationMessage.expectedCustomValueTo("equal <\(expectedValue)>", "nil")
            }
            return PredicateResult(status: .fail, message: message)
        }
        if expectedValue == nil {
            return PredicateResult(status: .fail, message: ExpectationMessage.fail("").appendedBeNilHint())
        }

        return PredicateResult(bool: receivedValue == expectedValue, message: ExpectationMessage.fail("Found difference for " + diff(expectedValue, receivedValue).joined(separator: ", ")))
    }
}