Add __init__.py files to fix import issues when running pytest

Add test.yml file for automatically running unit tests in GitHub actions

Cleanup test.py imports

.github/workflows/test.yml

@@ -0,0 +1,23 @@
+name: Run Python Unit Tests
+
+on:
+  push: # Run on every push event
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: [3.11]
+    steps:
+      - uses: actions/checkout@v3 # Checkout code from repository
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v3
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install -r requirements.txt
+      - name: Run tests
+        run: |
+          python -m pytest test/tests.py

test/tests.py

@@ -1,7 +1,16 @@
-from datetime import datetime, timezone, timedelta
+from datetime import (
+    datetime,
+    timezone,
+    timedelta
+)
 import pytest
 
-from main import app, calculate_timezone_offset, is_valid_timezone_format, datetime_to_requested_string_format
+from main import (
+    app,
+    calculate_timezone_offset,
+    is_valid_timezone_format,
+    datetime_to_requested_string_format
+)
 
 
 @pytest.fixture()