def helper_test_evaluate_raises(self,
expr,
expected_exc_type=None,
**kwargs):
"""Helper for testing the improper use of the ``evaluate`` function.
:param expr: The expression to attempt to evaluate.
:type expr: :class:`str <python:str>`
:param expected_exc_type: The exception type expected to be raised.
:type expected_exc_type: Exception
:param kwargs: The values to pass to the ``evaluate`` function.
"""
did_catch = False
try:
b = BooleanExpression(expr)
b.evaluate(**kwargs)
except expected_exc_type:
did_catch = True
except Exception as e:
traceback.print_exc()
self.fail('Received exception of type ' + type(e).__name__ +
' but was expecting type ' + expected_exc_type.__name__ +
'.')
did_catch = True
if not did_catch:
self.fail('No exception thrown.')
def helper_test_evaluate(self, expr, expected_result=None, **kwargs):
"""Helper for testing the evaluation of expressions.
:param expr: The expression to attempt to evaluate.
:type expr: :class:`str <python:str>`
:param expected_result: The truthy value expected to be the result of
evaluation the expression.
:type expected_result: :class:`bool <python:bool>` or
:class:`int <python:int>`
:param kwargs: The values to pass to the ``evaluate`` function.
"""
b = BooleanExpression(expr)
result = b.evaluate(**kwargs)
self.assertEqual(result, expected_result)