Add more tests

[aik099]

Right now code coverage is very low. Need to add more tests to fix it.

[aik099]

Also change existing tests to use namespaces. Namespace support in tests was added in #50.

[jpastoor]

I will start writing unit tests when the current batch of PR's is processed, and rename the namespace for tests to Tests\chobie\Jira.

[aik099]

OK.

[aik099]

We have 84.99% coverage now, and according to https://app.codecov.io/gh/console-helpers/jira-api-restclient?search=&displayType=list , the most uncovered files are:

• src/Jira/Issue.php
• src/Jira/Api/Authentication/Anonymous.php

These are straightforward classes, even The GitHub Copilot can write tests for them.