         return try decoder.decode(T.self, from: data)
     }
 
-    expectRoundTripEquality(of: value, encode: encode, decode: decode)
-}
-
-func expectRoundTripEqualityThroughPlist<T : Codable>(for value: T) where T : Equatable {
+    expectRoundTripEquality(of: value, encode: encode, decode: decode, lineNumber: lineNumber)
+}
+
+func expectRoundTripEqualityThroughPlist<T : Codable>(for value: T, lineNumber: Int) where T : Equatable {
     let encode = { (_ value: T) throws -> Data in
         return try PropertyListEncoder().encode(value)
     }

    return result
}

func expectRoundTripEquality<T : Codable>(of value: T, encode: (T) throws -> Data, decode: (Data) throws -> T) where T : Equatable {
    let data: Data
    do {
        data = try encode(value)
    } catch {
        fatalError("Unable to encode \(T.self) <\(value)>: \(error)")
    }

    let decoded: T
    do {
        decoded = try decode(data)
    } catch {
        fatalError("Unable to decode \(T.self) <\(value)>: \(error)")
    }

    expectEqual(value, decoded, "Decoded \(T.self) <\(decoded)> not equal to original <\(value)>")
}

func expectRoundTripEqualityThroughJSON<T : Codable>(for value: T) where T : Equatable {
    let inf = "INF", negInf = "-INF", nan = "NaN"
    let encode = { (_ value: T) throws -> Data in
        let encoder = JSONEncoder()

    // MARK: - AffineTransform
#if os(OSX)
    // FIXME: Comment the tests back in once rdar://problem/33363218 is in the SDK.
    lazy var affineTransformValues: [Int : AffineTransform] = [
        #line : AffineTransform.identity,
        #line : AffineTransform(),
        #line : AffineTransform(translationByX: 2.0, byY: 2.0),
        #line : AffineTransform(scale: 2.0),
        #line : AffineTransform(rotationByDegrees: .pi / 2),

        #line : AffineTransform(m11: 1.0, m12: 2.5, m21: 66.2, m22: 40.2, tX: -5.5, tY: 3.7),
        // #line : AffineTransform(m11: -55.66, m12: 22.7, m21: 1.5, m22: 0.0, tX: -22, tY: -33),
        #line : AffineTransform(m11: 4.5, m12: 1.1, m21: 0.025, m22: 0.077, tX: -0.55, tY: 33.2),
        // #line : AffineTransform(m11: 7.0, m12: -2.3, m21: 6.7, m22: 0.25, tX: 0.556, tY: 0.99),
        // #line : AffineTransform(m11: 0.498, m12: -0.284, m21: -0.742, m22: 0.3248, tX: 12, tY: 44)
    ]

    func test_AffineTransform_JSON() {
        for (testLine, transform) in affineTransformValues {
            expectRoundTripEqualityThroughJSON(for: transform, lineNumber: testLine)
        }
    }

    func test_AffineTransform_Plist() {
        for (testLine, transform) in affineTransformValues {
            expectRoundTripEqualityThroughPlist(for: transform, lineNumber: testLine)
        }
    }
#endif

    // MARK: - Calendar
    lazy var calendarValues: [Int : Calendar] = [
        #line : Calendar(identifier: .gregorian),
        #line : Calendar(identifier: .buddhist),
        #line : Calendar(identifier: .chinese),
        #line : Calendar(identifier: .coptic),
        #line : Calendar(identifier: .ethiopicAmeteMihret),
        #line : Calendar(identifier: .ethiopicAmeteAlem),
        #line : Calendar(identifier: .hebrew),
        #line : Calendar(identifier: .iso8601),
        #line : Calendar(identifier: .indian),
        #line : Calendar(identifier: .islamic),
        #line : Calendar(identifier: .islamicCivil),
        #line : Calendar(identifier: .japanese),
        #line : Calendar(identifier: .persian),
        #line : Calendar(identifier: .republicOfChina),
    ]

    func test_Calendar_JSON() {
        for (testLine, calendar) in calendarValues {
            expectRoundTripEqualityThroughJSON(for: calendar, lineNumber: testLine)
        }
    }

    func test_Calendar_Plist() {
        for (testLine, calendar) in calendarValues {
            expectRoundTripEqualityThroughPlist(for: calendar, lineNumber: testLine)
        }
    }

    // MARK: - CharacterSet
    lazy var characterSetValues: [Int : CharacterSet] = [
        #line : CharacterSet.controlCharacters,
        #line : CharacterSet.whitespaces,
        #line : CharacterSet.whitespacesAndNewlines,
        #line : CharacterSet.decimalDigits,
        #line : CharacterSet.letters,
        #line : CharacterSet.lowercaseLetters,
        #line : CharacterSet.uppercaseLetters,
        #line : CharacterSet.nonBaseCharacters,
        #line : CharacterSet.alphanumerics,
        #line : CharacterSet.decomposables,
        #line : CharacterSet.illegalCharacters,
        #line : CharacterSet.punctuationCharacters,
        #line : CharacterSet.capitalizedLetters,
        #line : CharacterSet.symbols,
        #line : CharacterSet.newlines
    ]

    func test_CharacterSet_JSON() {
        for (testLine, characterSet) in characterSetValues {
            expectRoundTripEqualityThroughJSON(for: characterSet, lineNumber: testLine)
        }
    }

    func test_CharacterSet_Plist() {
        for (testLine, characterSet) in characterSetValues {
            expectRoundTripEqualityThroughPlist(for: characterSet, lineNumber: testLine)
        }
    }

    // MARK: - CGAffineTransform
    lazy var cg_affineTransformValues: [Int : CGAffineTransform] = {
        // FIXME: Comment the tests back in once rdar://problem/33363218 is in the SDK.
        var values = [
            #line : CGAffineTransform.identity,
            #line : CGAffineTransform(),
            #line : CGAffineTransform(translationX: 2.0, y: 2.0),
            #line : CGAffineTransform(scaleX: 2.0, y: 2.0),
            #line : CGAffineTransform(a: 1.0, b: 2.5, c: 66.2, d: 40.2, tx: -5.5, ty: 3.7),
            // #line : CGAffineTransform(a: -55.66, b: 22.7, c: 1.5, d: 0.0, tx: -22, ty: -33),
            #line : CGAffineTransform(a: 4.5, b: 1.1, c: 0.025, d: 0.077, tx: -0.55, ty: 33.2),
            // #line : CGAffineTransform(a: 7.0, b: -2.3, c: 6.7, d: 0.25, tx: 0.556, ty: 0.99),
            // #line : CGAffineTransform(a: 0.498, b: -0.284, c: -0.742, d: 0.3248, tx: 12, ty: 44)
        ]

        if #available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *) {
            values[#line] = CGAffineTransform(rotationAngle: .pi / 2)
        }

        return values
    }()

    func test_CGAffineTransform_JSON() {
        for (testLine, transform) in cg_affineTransformValues {
            expectRoundTripEqualityThroughJSON(for: transform, lineNumber: testLine)
        }
    }

    func test_CGAffineTransform_Plist() {
        for (testLine, transform) in cg_affineTransformValues {
            expectRoundTripEqualityThroughPlist(for: transform, lineNumber: testLine)
        }
    }

    // MARK: - CGPoint
    lazy var cg_pointValues: [Int : CGPoint] = {
        var values = [
            #line : CGPoint.zero,
            #line : CGPoint(x: 10, y: 20)
        ]

        if #available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *) {
            // Limit on magnitude in JSON. See rdar://problem/12717407
            values[#line] = CGPoint(x: CGFloat.greatestFiniteMagnitude,
                                    y: CGFloat.greatestFiniteMagnitude)
        }

        return values
    }()

    func test_CGPoint_JSON() {
        for (testLine, point) in cg_pointValues {
            expectRoundTripEqualityThroughJSON(for: point, lineNumber: testLine)
        }
    }

    func test_CGPoint_Plist() {
        for (testLine, point) in cg_pointValues {
            expectRoundTripEqualityThroughPlist(for: point, lineNumber: testLine)
        }
    }

    // MARK: - CGSize
    lazy var cg_sizeValues: [Int : CGSize] = {
        var values = [
            #line : CGSize.zero,
            #line : CGSize(width: 30, height: 40)
        ]

        if #available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *) {
            // Limit on magnitude in JSON. See rdar://problem/12717407
            values[#line] = CGSize(width: CGFloat.greatestFiniteMagnitude,
                                   height: CGFloat.greatestFiniteMagnitude)
        }

        return values
    }()

    func test_CGSize_JSON() {
        for (testLine, size) in cg_sizeValues {
            expectRoundTripEqualityThroughJSON(for: size, lineNumber: testLine)
        }
    }

    func test_CGSize_Plist() {
        for (testLine, size) in cg_sizeValues {
            expectRoundTripEqualityThroughPlist(for: size, lineNumber: testLine)
        }
    }

    // MARK: - CGRect
    lazy var cg_rectValues: [Int : CGRect] = {
        // FIXME: Comment the tests back in once rdar://problem/33363218 is in the SDK.
        var values = [
            #line : CGRect.zero,
            // #line : CGRect.null,
            #line : CGRect(x: 10, y: 20, width: 30, height: 40)
        ]

        if #available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *) {
            // Limit on magnitude in JSON. See rdar://problem/12717407
            // values[#line] = CGRect.infinite
        }

        return values
    }()

    func test_CGRect_JSON() {
        for (testLine, rect) in cg_rectValues {
            expectRoundTripEqualityThroughJSON(for: rect, lineNumber: testLine)
        }
    }

    func test_CGRect_Plist() {
        for (testLine, rect) in cg_rectValues {
            expectRoundTripEqualityThroughPlist(for: rect, lineNumber: testLine)
        }
    }

    // MARK: - CGVector
    lazy var cg_vectorValues: [Int : CGVector] = {
        // FIXME: Comment the tests back in once rdar://problem/33363218 is in the SDK.
        var values = [
            #line : CGVector.zero,
            // #line : CGVector(dx: 0.0, dy: -9.81)
        ]

        if #available(OSX 10.13, iOS 11.0, watchOS 4.0, tvOS 11.0, *) {
            // Limit on magnitude in JSON. See rdar://problem/12717407
            values[#line] = CGVector(dx: CGFloat.greatestFiniteMagnitude,
                                     dy: CGFloat.greatestFiniteMagnitude)
        }

        return values
    }()

    func test_CGVector_JSON() {
        for (testLine, vector) in cg_vectorValues {
            expectRoundTripEqualityThroughJSON(for: vector, lineNumber: testLine)
        }
    }

    func test_CGVector_Plist() {
        for (testLine, vector) in cg_vectorValues {
            expectRoundTripEqualityThroughPlist(for: vector, lineNumber: testLine)
        }
    }

