cool swift unit test expectation syntax

tests.swift

func expect<T: Equatable>(value: T, file: String = __FILE__, line: Int = __LINE__) -> (T, String, Int) {
    return (value, file, line)
}

func ==<T: Equatable>(lhs: (T, String, Int), rhs: T) {
    if lhs.0 != rhs {
        XCTFail("Expected \(rhs), but got \(lhs.0) instead", file: lhs.1, line: UInt(lhs.2))
    }
}

func !=<T: Equatable>(lhs: (T, String, Int), rhs: T) {
    if lhs.0 == rhs {
        XCTFail("Expected \(rhs), but got \(lhs.0) instead", file: lhs.1, line: UInt(lhs.2))
    }
}

example test:

expect(foo.bar) == 2