Python interview questions and answers: Unit tests and TDD

Exploring testing in Python: Unit tests and TDD

Writing Unit Tests with unittest:

• What is unit testing in Python?

Explain the importance of unit testing in software development.

• What is the Python unittest framework?

Describe the features and purpose of the unittest module.

• How do you write a unit test using unittest in Python?

Use unittest to write a simple unit test for a Python function.

• What are the main components of a unit test using unittest in Python?

Explain the roles of TestCase, setUp(), and tearDown() methods in unit testing.

• What is a test case in unittest?

Define a test case and explain its role in the unittest framework.

• How do you run unit tests with unittest?

Describe how to execute unit tests using the unittest test runner.

• What are assertions in unit tests?

Explain the purpose of assertions and how they are used to verify code behavior.

• What is mocking in Python testing?

Explain how mocking is used in unit tests to isolate dependencies.

• What is coverage testing in Python?

Explain the importance of code coverage testing and how it helps identify untested parts of the code.

• How do you handle exceptions in unit tests?

Describe the best practices for handling exceptions in unit tests so that test results are accurate and meaningful.

• What are the common testing best practices in Python?

Provide a list of best practices for writing effective and maintainable unit tests in Python.

Test Driven Development (TDD) Approach

• What is Test-Driven Development (TDD) in Python?

Describe the TDD approach and its benefits in the software development lifecycle.

• Explain the three steps of the TDD cycle.

Describe the Red-Green-Refactor cycle in TDD and the purpose of each step.

• What are the advantages of TDD in Python development?

Discuss how TDD improves code quality, maintainability, and development efficiency.

• How do you start with TDD for a new Python feature?

Explain the process of writing tests before implementing code using TDD.

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