clang-format: [JS] test case for numeric separators.

ES2021 allows numeric literals using `_` as a separator. This already
works, but had no test.

Differential Revision: https://reviews.llvm.org/D115147

diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 0c8329d..069b7b1 100644 (file)
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -2692,5 +2692,9 @@ TEST_F(FormatTestJS, NoBreakAfterAsserts) {
       "}\n");
 }
 
+TEST_F(FormatTestJS, NumericSeparators) {
+  verifyFormat("x = 1_000_000 + 12;", "x = 1_000_000   + 12;");
+}
+
 } // namespace format
 } // end namespace clang