Eduardo Caldas af582c9b0f [SyntaxTree] Test findFirstLeaf and findLastLeaf ...

* 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.

Differential Revision: https://reviews.llvm.org/D87779

2020-09-22 06:47:36 +00:00

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