Tests: split the UI tests into one per callback.
Tests: correct button_valX references.
Tests: add a closeBox() test.
Tests: group callbacks together and assert later.
Tests: rename self.bla -> self.obj.
Tests: give various variables better names.
Tests: add a newline for readability.
Tests: add a missing documentation string.
Tests: add tests for UI.declare().
Tests: simplify an in-line FAUST program a bit.
Tests: remove a spurious newline.
Tests: __init__ does nothing, empty it.
Tests: replace assertEquals with assertEqual.

Replace the deprecated assertEquals with assertEqual.