examples/flask/40/app.py
from flask import Flask, jsonify
myapp = Flask(__name__)

@myapp.route("/")
def main():
    return '''
Main <a href="/add/23/19">add</a>
'''

@myapp.route("/add/<int:a>/<int:b>")
def api_info(a, b):
    return str(a+b)


examples/flask/40/test_app.py
from app import myapp
import unittest

# python -m unittest test_app


class TestMyApp(unittest.TestCase):
    def setUp(self):
        self.app = myapp.test_client()

    def test_main(self):
        rv = self.app.get('/')
        assert rv.status == '200 OK'
        assert b'Main' in rv.data
        #assert False

    def test_add(self):
        rv = self.app.get('/add/2/3')
        self.assertEqual(rv.status, '200 OK')
        self.assertEqual(rv.data, '5')

        rv = self.app.get('/add/0/10')
        self.assertEqual(rv.status, '200 OK')
        self.assertEqual(rv.data, '10')

    def test_404(self):
        rv = self.app.get('/other')
        self.assertEqual(rv.status, '404 NOT FOUND')