Question

Using Python Unit Test, How can I ensure that a particular string is printed , for example, how can I ensure that "hello world" is printed and If the string is different for example "Hello Chegg" it will raise an error?

Answer 1

You can use self.assertEqual() to check whether the string is 'hello world' or not and if it is not 'hello world' then the string won't be printed and will show Failed test.

Code for passed testcase along with image of the code and output:

import unittest

class stringTest(unittest.TestCase):
  
def test_helloWorld(self):
self.assertEqual('hello world', 'hello world') # Checking whether the strings are equal or not
print('hello world')

if __name__ == '__main__': # Main Function to enter in the program
unittest.main()

Code for failed testcase along with image of the code and output:

import unittest

class stringTest(unittest.TestCase):
  
def test_helloWorld(self):
self.assertEqual('hello world', 'Hello Chegg') # Checking whether the strings are equal or not
print('hello world')

if __name__ == '__main__': # Main Function to enter in the program
unittest.main()

Explanation: When both the string in self.assertEqual() are same then the unit test will be passed and the statement below the unit test line will be printed. While when both the strings are different the statement below the unit test line won't be printed.

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