Add charts base tests

Add base tests for all Chart classes (except BoxPlot),  and DataAdapter.

Test are not enough to say Charts are well covered by test but are a good foundation and test classes can be used from now on to add more tests, refactoring and to be extended when adding specific features
It tells the mismatch % .. but actually there's one thing that I can do to improve the feedback here and would be to add some information about the input that is failing (if `OrderedDict` or a `DataFrame`)