clang-format: [JS] Fix incorrect spacing around contextual keywords.

Before:
  x.of ();

After:
  x.of();

llvm-svn: 263710
diff --git a/clang/unittests/Format/FormatTestJS.cpp b/clang/unittests/Format/FormatTestJS.cpp
index 8d03964..822d572 100644
--- a/clang/unittests/Format/FormatTestJS.cpp
+++ b/clang/unittests/Format/FormatTestJS.cpp
@@ -125,6 +125,10 @@
   verifyFormat("x.class.struct = 1;");
   verifyFormat("x.case = 1;");
   verifyFormat("x.interface = 1;");
+  verifyFormat("x.of() = 1;");
+  verifyFormat("x.in() = 1;");
+  verifyFormat("x.let() = 1;");
+  verifyFormat("x.var() = 1;");
   verifyFormat("x = {\n"
                "  a: 12,\n"
                "  interface: 1,\n"