SwiftUI Previews Are Not Excluded From the Test Coverage Results #11

Description

Xcode previews are currently reported as uncovered code in the code coverage report.

Reproduction

Adding a SwiftUI preview (even with the DEBUG #if statement) is still reported in the code coverage, e.g.:

#if DEBUG
struct Example_Previews: PreviewProvider {
    static var previews: some View {
        Example()
    }
}
#endif

The behaviour can also be reproduced in different Spezi Swift Packages, including the diff code coverage in StanfordSpezi/SpeziAccount#6.

Expected behavior

The preview provides (or even the new #Preview macro) should be excluded from the code coverage report based on the TEST active compilation condition. The TEST active compilation condition should be propagated in the compilation for tests, and the DEBUG flag should ensure that the preview provider is built when showing a view in the Xcode preview.

Code of Conduct

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