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

Question

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

quamrana · Accepted Answer · 2021-08-20 08:44:58Z

2

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")

answered Aug 20, 2021 at 8:44

quamrana

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2 Comments

L44TXF Over a year ago

Thank you! is it possible to only pass if the Exception has a message, Exception("Username and Email address must be the same")?

quamrana Over a year ago

Have a look at this answer

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