docs(contributing): Highlight test steps

CONTRIBUTING.md

@@ -121,19 +121,30 @@ git checkout -b <topic-branch-name>
 
 4. Commit your changes in logical chunks. Use Git's [interactive rebase](https://help.github.com/articles/interactive-rebase) feature to tidy up your commits before making them public.
 
-5. Locally merge (or rebase) the upstream development branch into your topic branch:
+5. Run you code to make sure it works.
+
+```bash
+npm i
+rm chai.js
+make chai.js
+npm test
+# when finished running tests...
+git checkout chai.js
+```
+
+6. Locally merge (or rebase) the upstream development branch into your topic branch:
 
 ```bash
 git pull [--rebase] upstream <dev-branch>
 ```
 
-6. Push your topic branch up to your fork:
+7. Push your topic branch up to your fork:
 
 ```bash
 git push origin <topic-branch-name>
 ```
 
-7. [Open a Pull Request](https://help.github.com/articles/using-pull-requests/) with a clear title and description.
+8. [Open a Pull Request](https://help.github.com/articles/using-pull-requests/) with a clear title and description.
 
 **IMPORTANT**: By submitting a patch, you agree to allow the project owner to license your work under the same license as that used by the project.