ViewInspector | Runtime introspection and unit testing of SwiftUI views | Unit Testing library

This thread states that

XCTest is for functional testing, rather than asserting visual requirements

Which is true. So what you can do if you don't want to install the ViewInspector dependency, you can

1. Make your @State var color: Color have the default access modifier.
2. Have a function that toggles the color
3. Create an instance of the View
4. Test it.

Refer the screenshot below. Note that this has been done on playground, but the same can be referred on an actual project