Python Unit Test Cheat String

Python:

Python is an interactive and more accessible language than any other programming language. The python programming language uses a variety of libraries to perform the operations in a faster way. The python language can also be used in web development; Django and Flask are the frameworks used to create web applications using Python.

In Python, indentation is the main concept; if we do not follow proper indentation, the code may not run. We can easily create an application in Python if we are familiar with indentation, Variables, Operators, loop concepts and function concepts in python language. Python provides many libraries and functions to perform various operations and helps us solve problems. The unit test library, which is used for the testing of the software

Unit Testing

 Unit testing is a testing method used by testers to test the smallest testable parts in the software, and unit testing is the first level of testing in software testing. This unit testing method checks whether the given software is working as per its operations. The unittest framework is available in Python's xUnit style framework, which can be imported to check whether the item is working as designed or not.

The white box testing method is used for unit testing; it explains how to test a given software in a step-by-step procedure. The unit testing method supports object-oriented programming; that is, it supports python programming language and java programming language.

Unit Test Unit String

The unit test library testing is done with the help of the assertIn( ) function or method.The assertIn( ) function checks whether a string is contained in another. The assertion( ) function will take the three string values as the input and, in return, a Boolean value based on the conditions in the assertion( ) function conditions. If the critical value is contained in the assertIn( ) function, it will return the True value, and if the key value is not contained in the string, then it will return the False at the output.

Syntax:

assertIn(key, storage, data)

Parameters:                   

• Key: The key is a string that is passed into a function to check whether it is present inside the storage or not.
• Storage: The storage is also a string; the key value is searched in the storage whether it is present or not in the storage
• Data: This is the message which must be displayed at the output when the input key is not present in the storage.

Let us consider an example of the value of the positive test case for the given assert function; the positive test case indicates that the given key value is present inside the storage string.

Example:

#importing the library
importunittest


# Creating a class which contains the test function
Class NewclassMethods(Unittest.testcase)
#defining the test function, which will check whether the key is present in storage container or not
defpos_test(self):
key = ‘test’
storage = ‘testcase’
        # creating the error message if the given test case is not present in the storage
data = " The given key is not present in the storage."
        #using the assertIn( ) function to check if the key is present in the storage or not
self.asserIn(key, storage, data)


if   __name__ == ‘__main__:
unittest.main( )

Output:

Ran the test in 0.000000 s
Ok

Here we can observe that the output is ok in a positive test case without any error message. Now let us consider another example of a negative test case, which will return the error message when we run the program.

Example:

#importing the library
importunittest


# Creating a class which contains the test function
Class NewclassMethods(Unittest.testcase)
#defining the test function, which will check whether the key is present in storage container or not
defneg_test(self):
key = ‘value’
storage = ‘testcase’
        # creating the error message if the given test case is not present in the storage
data = " The given key is not present in the storage."
        # Use the assertIn( ) function to check if the key is present in the storage or not
self.asserIn(key, storage, data)




if   __name__ == ‘__main__:
unittest.main( )

Output:

False
FAIL: test_negative (__main__.TestStringMethods)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "p1.py", line 12, in neg_test
self.assertEqual(key, storage, message)
AssertionError: 'value’!= 'testcase'
- key
+ storage
 : Key string  is not present in the storage string


----------------------------------------------------------------------
Ran 1 test in 0.000s


FAILED (failures=1)