Update CI: tests were running entire standard library

Fix: bug where CI was running unittests of the entire Python standard library instead of only my test directory for my project

.github/workflows/ci.yml

@@ -32,5 +32,7 @@ jobs:
           cd ../../
 
       - name: Run Tests
-        run: python -m unittest discover -s test
+        run: |
+          cd simulator/
+          python -m unittest discover -s test