Test-Driven Development - Process and Benefits

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

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QUESTION OF

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Views #: 184

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?

Testing and code development

Architecture design and performance profiling

Code review and deployment

Requirements analysis and system design

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TDD Process Cycle

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

Implement the functionality and re-run all tests

Write an automated test for the new functionality

Run the test - it should fail since the functionality is not yet implemented

Identify the functionality increment to be implemented

Refactor code to improve structure and clarity once all tests pass

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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?

It confirms the test is actually checking the intended functionality and that the functionality does not already exist

It allows the team to record the defect in the bug tracking system before fixing it

A failing test proves that the testing framework itself is working correctly

It satisfies agile process requirements that mandate at least one failed test per sprint

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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?

Every code increment written in TDD has at least one associated test, so all code that is added is tested

TDD enforces 100% branch coverage through mandatory path analysis before coding begins

TDD requires that coverage tools be run after every commit to the repository

Coverage is automatically guaranteed because TDD uses formal verification methods

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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?

TDD isolates new features in separate modules so they cannot affect existing regression tests

As features are developed, a suite of tests accumulates; these are re-run with each new increment to check that nothing has been broken

TDD recommends deleting old tests when new features are added to avoid conflicts

TDD generates regression test reports automatically and emails them to the development team

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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?

TDD prevents defects from being introduced by enforcing code reviews before every commit

The defect must be in the new code just written, since all previous tests were passing before this increment was added

TDD test frameworks include built-in debuggers that automatically pinpoint the line of the defect

TDD uses formal methods to prove the correctness of each code increment

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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?

The tests document the performance characteristics of every system component

The tests generate UML diagrams that document the system architecture

The tests auto-generate user manuals in natural language

The tests provide a working description of what the code should do, readable by any programmer familiar with the programming language

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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."

Please drag and drop the selected option in the right place or type it instead

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?

Increments must be formally specified before any tests are written

Each increment should be small enough that you can write a single test for it and implement it quickly

Each increment should correspond to exactly one sprint in an agile project

Each increment should be a complete user story or feature that can be demonstrated to a customer

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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.

Tests act as a form of system documentation

TDD completely eliminates the need for system and acceptance testing

Debugging is simplified - when a test fails, the defect must be in the new code

Comprehensive code coverage - every code increment has at least one test

TDD guarantees zero defects in the final system

Regression testing is continuously supported through the accumulated test suite

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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?

To improve the structure and clarity of the code without changing its external behavior

To remove test code from the production codebase

To add new functionality that was not part of the original increment specification

To convert the automated tests into manual test scripts for documentation

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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)."

Please drag and drop the selected option in the right place or type it instead

increment

tests

sprint

reviews

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Undergraduate Professional

What TDD Interleaves

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Explanation

TDD Process Cycle

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Explanation

Why the Initial Test Must Fail

Correct Answer

Explanation

TDD and Code Coverage

Correct Answer

Explanation

TDD and Regression Testing

Correct Answer

Explanation

TDD and Debugging Simplification

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Explanation

TDD Tests as System Documentation

Correct Answer

Explanation

TDD Origin and Adoption

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Explanation

Small Increments in TDD

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Explanation

Benefits of TDD - Comprehensive Summary

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Explanation

Refactoring in TDD

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TDD and Test-First Development Principle

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