Test-Driven Development - Process and Benefits

TDD cycle, 5 steps, code coverage, regression testing, simplified debugging, system documentation

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QUESTION OF
Views #: 4
Questions #: 12
Time: 10 minutes
Pass Score: 80.0%
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What TDD Interleaves

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Test-driven development (TDD) is an approach to program development in which two activities are interleaved throughout the process. Which two activities does TDD interleave?

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TDD Process Cycle

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The TDD cycle consists of five steps. Arrange them in the correct order.

Identify new functionality Write test Run test Implement functionality and refactor fail pass
Implement the functionality and re-run all tests
Write an automated test for the new functionality
Identify the functionality increment to be implemented
Refactor code to improve structure and clarity once all tests pass
Run the test - it should fail since the functionality is not yet implemented
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Why the Initial Test Must Fail

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In TDD, after writing a test for new functionality, the developer runs the test and expects it to fail. Why is this initial failure important?

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TDD and Code Coverage

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One of the benefits of TDD is that it leads to high code coverage. Why does TDD help achieve comprehensive code coverage?

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TDD and Regression Testing

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How does TDD support regression testing when new features are added to an existing system?

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TDD and Debugging Simplification

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TDD simplifies debugging. When a test fails during TDD development, why is it easier to locate the defect than in traditional test-after-code approaches?

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TDD Tests as System Documentation

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How do the tests written in TDD serve as a form of system documentation?

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TDD Origin and Adoption

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Complete the statement about TDD's origin and spread: "Test-driven development was originally introduced as part of the (1) agile development method. However, it has now gained mainstream acceptance and may be used in both (2) and plan-based processes."

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XP (Extreme Programming)
agile and plan-based
Scrum
incremental only
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Small Increments in TDD

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TDD requires identifying small functionality increments to implement. What is the recommended granularity of these increments?

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Benefits of TDD - Comprehensive Summary

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Which of the following are documented benefits of test-driven development? Select all that apply.

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Refactoring in TDD

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After all tests pass in a TDD cycle, the developer is expected to refactor the code. What is the purpose of this refactoring step?

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TDD and Test-First Development Principle

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Complete the key principle of TDD: "You don't start working on the next (1) until the code that you have developed passes all of its (2)."

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increment
tests
sprint
reviews
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