### Creating a Custom Unittest Class for a SimpleInteger ModuleThis guide details how to design a unittest class to test a `SimpleInteger` class within an `si` module. The module includes several arithmetic functions. Here's a breakdown of each step and function involved:#### Functions in the SimpleInteger Class:1. **add(a, b)**: Returns the sum of `a` and `b`.2. **subtract(a, b)**: Returns the difference between `a` and `b`.3. **multiply(a, b)**: Returns the product of `a` and `b`.4. **isequal(a, b)**: Returns `True` if `a` is equal to `b`, otherwise `False`.5. **isgreaterthan(a, b)**: Returns `True` if `a` is greater than `b`, otherwise `False`.**Note:** All functions return `None` if either `a` or `b` is not an integer.#### Steps to Create a Test Module:1. **Create a File:** - Name your file `test.py`.2. **Import Required Modules:** - Include built-in modules `unittest` and `io`. - Import the `si` module.3. **Define a Testing Class:** - Create a class named `Test01_add_valid_data` inheriting from `unittest.TestCase`. - **Member Function for Testing:** 1. Define a function `test_list_int` to test integer addition. 2. Inside this function: - Instantiate the `SimpleInteger` class. - Call the `add` function with integers, e.g., `1` and `2`. - Use `unittest`'s `self.assertEqual` to compare the expected output (e.g., `3`) with the actual output.4. **Documentation:** - Use docstrings to describe what each unit of the test is checking and the expected result for a given input.This guide assists you in setting up robust unittests to ensure the correctness of arithmetic functions within a `SimpleInteger` class, ensuring reliable output for integer inputs.

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Answered: 1. Write a custom unittest Class that…

Computer Networking: A Top-Down Approach (7th Edition)

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Chapter1: Computer Networks And The Internet

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