[e2e] Move the smoke tests to a new root folder "e2e_tests/"

.github/workflows/pythonpackage.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Quick e2e smoke test
         run: |
           source $VENV
-          python tools/sandbox_e2e_smoke_test.py
+          python e2e_tests/sandbox_basic_test.py
       - name: Upload code coverage
         uses: codecov/codecov-action@v1.0.10
         with:

e2e_tests/sandbox_basic_test.py

@@ -14,6 +14,11 @@ def launch_sandbox_script():
     basic_app.run()
 
 
+# The following line seems to be required in order to have this work in the MacOS part
+# of our CI - despite the fact that Python docs say that this function
+# "has no effect when invoked on any operating system other than Windows" 🤔
+multiprocessing.freeze_support()
+
 process = multiprocessing.Process(target=launch_sandbox_script, daemon=True)
 process.start()