Tests for signup, login and logout endpoints

[nicole-mcg]

Tests should be made for the SignupEndpoint, LoginEndpoint and LogoutEndpoint classes in file_server/web/endpoints/. I'm grouping these together because I feel like there could be ways to create short but extensive tests by testing some functionality together (through parameterization)

You can create a test server for endpoints with create_test_server in file_server/util/test_util.py. An example test can be found at file_server/web/endpoints/__test__/test_directory_contents.py

The following tests should be made:

Signup

• Verify SignupEndpoint error with blank username and password (test each seperately)
• Use SignupEndpoint to create an account, verify returned session is valid with Account.is_valid_session
• Create auth with Account.create_auth(), Verify error when trying to create account that already exists
• Create another account with the auth. Verify this account's session as well

Login

• Login with created account (can be creating eith SignupEndpoint or Account.create_account), verify session
• Verify error when username and password are incorrect (test each seperately)

Logout

• Login with created account (can be creating eith SignupEndpoint or Account.create_account), verify session
• Use LogoutEndpoint and verify session is no longer valid with Account.is_valid_session

Test naming conventions: https://pytest.readthedocs.io/en/reorganize-docs/new-docs/user/naming_conventions.html