[6.0] Implement a version of `SwiftSyntaxMacrosTestsSupport` that is framework agnostic#2655

Merged

ahoppen merged 7 commits intoswiftlang:release/6.0from

ahoppen:6.0/framework-agnostic-tests

May 17, 2024

Commits on May 16, 2024

Move `assertStringsEqualWithDiff` into a module that doesn’t depend on Foundation or XCTest
ahoppen
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Add a platform-agnostic macro testing module that doesn’t depend on XCTest or Foundation
ahoppen
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Recore `SwiftSyntaxMacrosTestSupport` on top of `SwiftSyntaxMacrosTestSupportFrameworkAgnostic`
ahoppen
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Address review comments
ahoppen
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Make unsigned and static properties in `TestFailureLocation` SPI
ahoppen
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Rename module from `FrameworkAgnostic` to `Generic`
ahoppen
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Shrink dependency list of `SwiftSyntaxMacrosTestSupport`
ahoppen
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