Ignore using the correct glob.

.gitignore

@@ -28,9 +28,9 @@ build.json
 *.actual
 tests/webhost/*.d.ts
 tests/webhost/webtsc.js
-tests/**/*.js
-tests/**/*.js.map
-tests/**/*.d.ts
+tests/cases/**/*.js
+tests/cases/**/*.js.map
+tests/cases/**/*.d.ts
 *.config
 scripts/debug.bat
 scripts/run.bat