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Paul LeMarquand
9af9441d59
When semantic test discovery encounters XCTest methods in an extension it adds the extension definition to the root items list for each child test method. With N test methods, the same extension root appears N times, each copy receiving all N children. After merging, this produces N*N test items instead of N. The bug is normally masked by the syntactic index, which provides correct results that take priority via combineTests(). This bug was exposed while I was debugging why tests generated by build plugins would appear multiple times. Turns out because they don't exist on disk at the time of the syntatic scan only the semantic results are used, which surfaced the issue. The fix is to track already-added extension USRs to ensure each extension added once as a root item.