How to compare two UIDynamicProviderColor?

I'm comparing two UIColor initialised using the new iOS 13 init(dynamicProvider:)

https://developer.apple.com/documentation/uikit/uicolor/3238041-init

but that's what I get runtime when I compare them in unit test with an XCTAssertEqual:

XCTAssertEqual failed: ("Optional(<UIDynamicProviderColor: {...}; 
provider = <__NSMallocBlock__: {...}>>)") is not equal to 
("Optional(<UIDynamicProviderColor: {...}; provider = <__NSMallocBlock__: {...}>>)")

This is an example of how I create the color:

struct Style {
    static var color: UIColor {
        if #available(iOS 13.0, *) {
                return UIColor { traitCollection in
                    return traitCollection.userInterfaceStyle == .dark ? .secondarySystemBackground : UIColor.white
                }
        } else {
            return UIColor.white
        }
    }
}

The test code:

func testExample() {
    XCTAssertEqual(Style.color, Style.color)
}

I tried overriding isEqual method of UIColor with an extension but apparently it's not called.

Do you have any workaround for this?

One solution to your unit test is by changing your code to this:

XCTAssertEqual(Style.color.cgColor, yourExpectedColor.cgColor)

In the iOS 13 at runtime it is comparing two UIDynamicProviderColor objects that return an UIColor object after running a block "(UITraitCollection) -> UIColor". So, that's the reason you have two different objects. Getting the cgColor from both you can compare them correctly. I hope I was helpfull.