Add mocha to javascript examples

doc/ci/unit_test_reports.md

@@ -290,6 +290,24 @@ javascript:
         - junit.xml
 ```
 
+#### Mocha
+
+The [JUnit Reporter for Mocha](https://github.com/michaelleeallen/mocha-junit-reporter) NPM package can generate test reports for JavaScript
+applications.
+In the following `.gitlab-ci.yml` example, the `javascript` job uses Mocha to generate the test reports:
+
+```yaml
+javascript:
+  stage: test
+  script:
+    - mocha --reporter mocha-junit-reporter --reporter-options mochaFile=junit.xml
+  artifacts:
+    when: always
+    reports:
+      junit:
+        - junit.xml
+```
+
 ### Flutter / Dart example
 
 This example `.gitlab-ci.yml` file uses the [JUnit Report](https://pub.dev/packages/junitreport) package to convert the `flutter test` output into JUnit report XML format: