'See if division by zero raises an error.'

def test_raises_zero_division_err(self):

    sample_dict = {'x': (1, 2)}
    problem = self.build_problem(sample_dict=sample_dict, num_samples=10, tolerance='1%', answer='x')
    input_dict = {'1_2_1': '1/0'}
    self.assertRaises(StudentInputError, problem.grade_answers, input_dict)
