BasePage
class include basic functionality and driver initialization
MainPage
is derived from the `BasePage class, it contains methods related to this page, which will be used to create test steps.
Note
When you want to write tests, you should derive your test class from BaseTest
which holds basic functionality for your tests. Then you can call page and related methods in accordance with the steps in the test cases
python -m unittest
python -m unittest tests.test_sign_in_page.TestSignInPage
python -m unittest tests.test_sign_in_page.TestSignInPage.test_page_load