update workflow

.github/workflows/main.yml

@@ -144,10 +144,11 @@ jobs:
           cd metadrive/
           pip install nbmake pytest-xdist
           cache store
-               
+
 #         move to test dir. If it is in a python package, then the test will fail!
-          cp ./examples/Basic_MetaDrive_Usages.ipynb ./tests
-          pytest --nbmake -n=auto ./tests
+          mkdir ./tests/test_ipynb
+          cp ./examples/Basic_MetaDrive_Usages.ipynb ./test/tests_ipynb
+          pytest --nbmake -n=auto ./test/tests_ipynb
 
 #      - name: Upload coverage to Codecov
 #        uses: codecov/codecov-action@v1