CODEWITHSUNDEEP
pythonunit-testingpython-unittest
L44TXF
L44TXF

Reputation: 95

How to create a test case in python which passes if an exception is raised?

My code tests if the inputted email and username are the same and raises an error if they are not. I am trying to test the code and it should pass if an exception is raised but I get the exception but the test still fails. Code:

def is_valid_email(email, cognitoUsername):
    if email != cognitoUsername:
        print("User email invalid")
        raise Exception("Username and Email address must be the same")
    print("User email valid")
    return True

Test:

self.assertEqual(lambda_function.is_valid_email("[email protected]", "[email protected]"), True)
self.assertRaises(Exception, lambda_function.is_valid_email("[email protected]", "test"))

Error:


email = '[email protected]', cognitoUsername = 'test'

    def is_valid_email(email, cognitoUsername):
        if email != cognitoUsername:
            print("User email invalid")
>           raise Exception("Username and Email address must be the same")
E           Exception: Username and Email address must be the same

../lambda_function.py:32: Exception




============================== 1 failed in 0.53s ===============================

Process finished with exit code 1

Upvotes: 1

Views: 623

Answers (1)

quamrana
quamrana

Reputation: 39354

Your test code should call assertRaises() with a callable:

self.assertRaises(Exception, lambda: lambda_function.is_valid_email("[email protected]", "test"))

The other option is to use with like this:

with self.assertRaises(Exception):
    lambda_function.is_valid_email("[email protected]", "test")

Upvotes: 2

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