[PATCH] D87779: [SyntaxTree] Test `findFirstLeaf` and `findLastLeaf`

[Eduardo Caldas via Phabricator via cfe-commits]

eduucaldas created this revision.
Herald added subscribers: cfe-commits, mgorny.
Herald added a project: clang.
eduucaldas requested review of this revision.

- Introduce `TreeTest.cpp` to unit test `Tree.h`
- Add `generateAllTreesWithShape` to generating test cases
- Add tests for `findFirstLeaf` and `findLastLeaf`
- Fix implementations of `findFirstLeaf` and `findLastLeaf` that had

been broken when empty `Tree` were present.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87779

Files:
  clang/lib/Tooling/Syntax/Tree.cpp
  clang/unittests/Tooling/Syntax/CMakeLists.txt
  clang/unittests/Tooling/Syntax/TreeTest.cpp

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