Python Flask Unit Tests

01_unit_tests_with_flask.md

$ docker build -t local:flask .
$ docker run -it -p 8080:8080 local:flask

$ python app_test.py
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK

Resource:

• https://aws.amazon.com/blogs/containers/create-a-ci-cd-pipeline-for-amazon-ecs-with-github-actions-and-aws-codebuild-tests/

app.py

"""Main application file"""
from flask import Flask
app = Flask(__name__)

@app.route('/<random_string>')
def returnBackwardsString(random_string):
    """Reverse and return the provided URI"""
    return "".join(reversed(random_string))

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)

app_test.py

"""Unit test file for app.py"""
from app import returnBackwardsString
import unittest

class TestApp(unittest.TestCase):
    """Unit tests defined for app.py"""

    def test_return_backwards_string(self):
        """Test return backwards simple string"""
        random_string = "This is my test string"
        random_string_reversed = "gnirts tset ym si sihT"
        self.assertEqual(random_string_reversed, returnBackwardsString(random_string))

if __name__ == "__main__":
    unittest.main()

Dockerfile

FROM python:3
# Set application working directory
WORKDIR /usr/src/app
# Install requirements
COPY requirements.txt ./
RUN pip install --no-cache-dir -r requirements.txt
# Install application
COPY app.py ./
# Run application
CMD python app.py

requirements.txt

flask