Unit Testing Interview Questions For Freshers

Why is unit testing important?

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What are the benefits of unit testing?

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What is the difference between unit testing and integration testing?

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What are the characteristics of a good unit test?

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What tools/frameworks can be used for unit testing in your preferred language?

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What are the basic steps involved in writing a unit test?

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What is a test case in unit testing?

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What is a test fixture in unit testing?

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What is a test suite in unit testing?

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What is a test runner in unit testing?

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What is test-driven development (TDD)?

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What is the Arrange-Act-Assert pattern?

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What are test doubles (mocks, stubs, fakes) and how are they used in unit testing?

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What is code coverage and why is it useful?

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What is unit testing?

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Unit Testing Intermediate Interview Questions

What is the purpose of a test double in unit testing? Give an example.

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What are some disadvantages of using test doubles in unit testing?

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Why is it important to isolate unit tests?

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What is a test harness in unit testing? Give an example.

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What is mutation testing?

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What is the purpose of a unit test suite?

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What is the difference between mocks and stubs?

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What is the testing pyramid and why is it important?

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What are some common mistakes to avoid when writing unit tests?

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What is test coverage and how can you measure it?

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How would you handle testing external dependencies in unit tests?

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When should you use a mock object instead of a real object in unit testing?

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What is the AAA pattern in unit testing?

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What are some best practices for writing effective unit tests?

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What is the purpose of test frameworks in unit testing?

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Explain the concept of testability in unit testing.

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What is the difference between white-box testing and black-box testing?

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What is the difference between top-down testing and bottom-up testing?

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What are some common testing patterns used in unit testing?

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Unit Testing Interview Questions For Experienced

What are the key differences between unit testing and integration testing?

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What is Mockito in Java and how is it used in unit testing?

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Explain the concept of dependency injection and how it relates to unit testing.

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What is contract testing and how is it useful in unit testing?

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What is a test fixture in pytest and how is it used?

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What is property-based testing and how is it different from example-based testing?

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What are some advanced mocking techniques used in unit testing?

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Explain the concept of state-based testing and how it is done in unit testing.

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How does behavior-driven development (BDD) relate to unit testing?

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What are the limitations of unit testing?

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How can you handle time-dependent code in unit tests?

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What is mutation testing and how is it performed?

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What is the role of test-driven development (TDD) in unit testing?

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What are some best practices for organizing and managing unit tests?

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How can you ensure that unit tests are maintainable and less prone to breakage?

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Explain the concept of test doubles (mocks, stubs, fakes) in unit testing.

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What is the purpose of test coverage metrics and how are they useful?

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What are the advantages of using property-based testing in unit testing?

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What is the purpose of test fixtures and how are they managed in unit testing?

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What are some popular unit testing frameworks used in your preferred language?

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What are some common challenges faced in unit testing? How can they be overcome?

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What is the purpose of assertions in unit testing and how are they used?

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What are some techniques for testing exception handling in unit tests?

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Explain the concept of test data creation in unit testing.

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How can you handle database dependencies in unit tests?

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What is the purpose of benchmarking in unit testing?

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How can you automate the execution of unit tests?

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