assert a or b, 'aaa'



assert        : keyword.control.flow.python, source.python
 a            : source.python
or            : keyword.operator.python, source.python
 b,           : source.python
'             : punctuation.definition.string.begin.python, source.python, string.quoted.single.python
aaa           : source.python, string.quoted.single.python
'             : punctuation.definition.string.end.python, source.python, string.quoted.single.python

Add a test for the assert statement