Goal

Unit test the printCurrentDate function.

1. Test the code with doubles from a library.
2. Test the code with doubles created by you.

Code to test

class PrintDate:
    def __init__(self, calendar, printer):
        self.printer = printer
        self.calendar = calendar

    def print_current_date(self):
        self.printer.print_line(self.calendar.today())

Learnings

How to build a Mock and Stub manually.

How to use Unittest Mock to generate the doubles.

Tools

Unittest documentation

Example of spy

def test_should_send_an_email(self):
    emailSender = Mock(EmailSender)
    user_registration = UserRegistration(email_sender)

    user_registration.register()

    email_sender.send.assert_called()

Example of stub

def test_should_success_when_password_is_valid(self):
    password_validator = Mock(PasswordValidator)
    password_validator.is_valid = Mock(return_value=true)
    user_registration = UserRegistration(password_validator)

    success = user_registration.register()

    assertTrue(success)

How to run and see the result

Locally

on Linux and Mac

Run the tests

make tests

Run the code coverage

make coverage

on Windows

Open the Makefile and copy and paste the lines below each command.

Docker

on Linux and Mac

Generate the image

make docker-build

Run the tests

make docker-tests

Run the code coverage

make docker-coverage

on Windows

Open the Makefile and copy and paste the lines below each command.

Authors

Luis Rovirosa @luisrovirosa

Jordi Anguela @jordianguela