Added all code, unit tests, and a Github action to run the automated test workflow on push and on pull request events.

Author: sabajamalian

.github/workflows/unittests.yaml

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+name: Continuous Integration
+on: [push, pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.10.0
+          architecture: x64
+      - name: Install dependencies
+        run: pip install -r requirements.txt 
+      - name: Run Tests
+        run: python -m pytest

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/

README.md

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+# BankAccount
+This is an educational public repository to illustrate the power of automated testing through Github Actions.
+
+# Run locally
+1. Set up Python virtual environment.
+```
+python -m venv venv
+```
+2. Install required dependencies.
+```
+pip install -r requirements.txt
+```
+3. Run unit tests.
+```
+python -m pytest
+```
+4. Run the app.
+```
+python app.py
+```

app.py

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+from flask import Flask, jsonify, request
+
+app = Flask(__name__)
+
+balance = 0
+
+@app.route('/')
+def index():
+    return jsonify({'balance': balance})
+
+@app.route('/deposit')
+def deposit():
+    global balance
+    amount = request.args.get('amount')
+    balance = balance + int(amount)
+    return jsonify({'balance': balance})
+
+@app.route('/withdraw')
+def withdraw():
+    global balance
+    amount = request.args.get('amount')
+    if(int(amount) > balance):
+        return jsonify({'balance': balance})    
+    balance = balance - int(amount)
+    return jsonify({'balance': balance})
+
+if __name__ == '__main__':
+    app.run(debug=True)

requirements.txt

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+import pytest
+
+from app import app as flask_app
+
+
+@pytest.fixture
+def app():
+    yield flask_app
+
+
+@pytest.fixture
+def client(app):
+    return app.test_client()

tests/__init__.py

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+import json
+
+def test_balance(app, client):
+    del app
+    res = client.get('/')
+    assert res.status_code == 200
+    expected = {'balance': 0}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_deposit(app, client):
+    del app
+    res = client.get('/deposit?amount=500')
+    assert res.status_code == 200
+    expected = {'balance': 500}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_deposit_2(app, client):
+    del app
+    res = client.get('/deposit?amount=300')
+    assert res.status_code == 200
+    expected = {'balance': 800}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_withdraw_1(app, client):
+    del app
+    res = client.get('/withdraw?amount=1000')
+    assert res.status_code == 200
+    expected = {'balance': 800}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_withdraw_2(app, client):
+    del app
+    res = client.get('/withdraw?amount=100')
+    assert res.status_code == 200
+    expected = {'balance': 700}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_deposit_3(app, client):
+    del app
+    res = client.get('/deposit?amount=500')
+    assert res.status_code == 200
+    expected = {'balance': 1200}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_withdraw_3(app, client):
+    del app
+    res = client.get('/withdraw?amount=1000')
+    assert res.status_code == 200
+    expected = {'balance': 200}
+    assert expected == json.loads(res.get_data(as_text=True))
+
+def test_balance_2(app, client):
+    del app
+    res = client.get('/')
+    assert res.status_code == 200
+    expected = {'balance': 200}
+    assert expected == json.loads(res.get_data(as_text=True))