[refactor] Add a doc comment to the test function in the selection

unittest.

As suggested by Haojian Wu!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@316105 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/unittests/Tooling/ASTSelectionTest.cpp b/unittests/Tooling/ASTSelectionTest.cpp
index 386ae336a8be528deea843bb5f83c00968e68515..79e89f90f49d083847ff66b57a28cc317c0b6de9 100644 (file)
--- a/unittests/Tooling/ASTSelectionTest.cpp
+++ b/unittests/Tooling/ASTSelectionTest.cpp
@@ -59,6 +59,11 @@ public:
   }
 };
 
+/// This is a test utility function that computes the AST selection at the
+/// given location with an optional selection range.
+///
+/// A location roughly corresponds to a cursor location in an editor, while
+/// the optional range corresponds to the selection range in an editor.
 void findSelectedASTNodesWithRange(
     StringRef Source, FileLocation Location, Optional<FileRange> SelectionRange,
     llvm::function_ref<void(SourceRange SelectionRange,