Initiated phpunit test files.
Added unit tests for the methods in HtmlClass\Form that I knew how to implement right now. Will come back other methods I am unsure of. Refactored HtmlClass\Form a bit to make it more testable.
Moved getMethod(), getProperty(), and setProperty() into another class that all tests extend from so they can be accessed from all classes.
Wrote as many tests for Field.php as I could. Refactored Field.php a bit to make it more testable.