BDD for Flask application using Behave & Selenium

This is a very simple Flask application with only login feature. The login feature implemented here is just for demo purpose. The code demonstrates the use of Behave and Selenium for writing acceptance/e2e tests.

Installation

Use the package manager pip to install dependencies from requirements.txt

pip install -r requirements.txt

Here I am using the chrome web driver so that selenium can interact with Chrome browser. You can download the chrome webdriver compatible with your Chrome browser from here and place it in the folder as features/driver/chromedriver.exe

Execution

Execute this command on terminal:

behave

This will give the output like:

Feature: Login # features/login.feature:1
  """
  Login feature will test for successful and failed login attempts
  """
  Scenario: Success test for login          # features/login.feature:6
    Given I navigate to login page          # features/steps/login.py:4
    And I enter valid username and password # features/steps/login.py:13
    When I click on Submit button           # features/steps/login.py:24
    Then login is successful                # features/steps/login.py:33

  Scenario: Failure test for login           # features/login.feature:12
    Given I navigate to login page           # features/steps/login.py:4
    And I enter invalid username or password # features/steps/login.py:43
    When I click on Submit button            # features/steps/login.py:24
    Then login fails                         # features/steps/login.py:54

1 feature passed, 0 failed, 0 skipped
2 scenarios passed, 0 failed, 0 skipped
8 steps passed, 0 failed, 0 skipped, 0 undefined
Took 0m1.010s

If you want to see how actually the chrome window opens and the tests in feature file are executed comment this line from features/environment.py and add some time.sleep() if required:

chrome_options.add_argument("--headless")