[WIP, DNM] Prototype #expect() overloads outside the testing library.
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This PR introduces an overload of `#expect()`/`#require()` that's implemented outside the core Swift Testing library. It implements exit tests based on Foundation's `Process` class (AKA `NSTask`.) I do **not** plan to merge this PR. Rather, it's serving as a breadboard to let me prototype overloading `#expect()` outside Swift Testing, which we can then apply to other libraries like `swift-subprocess` and `swift-argument-parser`.
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This PR introduces an overload of
#expect()/#require()that's implemented outside the core Swift Testing library. It implements exit tests based on Foundation'sProcessclass (AKANSTask.)I do not plan to merge this PR. Rather, it's serving as a breadboard to let me prototype overloading
#expect()outside Swift Testing, which we can then apply to other libraries likeswift-subprocessandswift-argument-parser.