Test-Driven Development - Limitations and Context

TDD Limitation - Incomplete Test Coverage

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Although TDD leads to high code coverage, it does not guarantee complete test coverage. What is one reason why some code may not be adequately tested even in a TDD project?

Some programmers write tests that make code pass without really testing the behavior thoroughly, or write tests that are too closely tied to the implementation

TDD prevents writing tests for error-handling code

TDD only supports testing public methods, leaving private methods untested

TDD frameworks cannot handle object-oriented code with inheritance

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TDD and Multithreaded Programs

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TDD has a significant limitation when applied to multithreaded programs. What is this limitation?

Multithreaded programs cannot be written in languages supported by TDD frameworks

Tests for multithreaded programs are inherently non-deterministic because thread scheduling can vary, making defects difficult to reproduce consistently

Multithreaded programs require hardware testing rigs that TDD cannot interface with

TDD frameworks block the creation of multiple threads during testing

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TDD and Legacy Systems

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TDD is difficult to apply when working with legacy systems. What is the primary reason for this difficulty?

Legacy systems are always written in languages that do not support automated testing

TDD frameworks do not support connecting to legacy databases

It is hard to write unit tests for legacy code because the code was not originally designed with testability in mind, often having tight coupling and no clear interfaces

Legacy systems are too large for TDD to be applied efficiently

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TDD Does Not Replace System Testing

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Even in a project that strictly follows TDD, which forms of testing are still necessary? Select all that apply.

User testing to account for the effects of the real working environment

Release testing to convince the supplier the system is good enough for delivery

None - TDD test suites are sufficient for all testing purposes

System testing to verify interactions between components and emergent system behavior

Performance testing of the complete integrated system under realistic loads

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TDD and Test Scope

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TDD tests are typically written at which testing level, and what does this mean for broader test coverage?

System level - TDD tests cover interactions between all system components

Unit level - TDD tests verify individual functions or methods, leaving higher-level interaction testing to other testing stages

Performance level - TDD tests primarily measure execution speed of each method

Acceptance level - TDD tests are equivalent to acceptance tests defined by customers

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TDD Practical Adoption

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Which of the following statements about TDD adoption in industry are accurate? Select all that apply.

TDD was introduced as part of XP but is now used beyond agile contexts

TDD is mandatory under all major software quality standards worldwide

Many development teams adopt a modified form of TDD rather than following it strictly

Some developers write tests after code rather than before, departing from strict TDD

TDD is considered beneficial but not universally applied in all project types

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TDD Test Suite as a Safety Net

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How does the accumulated TDD test suite function as a safety net during ongoing development?

It generates automatic rollback of code if more than 10% of tests fail

It provides immediate feedback when any code change breaks previously working functionality

It prevents developers from committing code to the repository without manager approval

It creates formal proof that the system is defect-free before each release

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TDD Limitation - GUI-Heavy Systems

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TDD is less effective for which type of system, and why?

Web services, because HTTP cannot be mocked in unit tests

Database-driven systems, because databases cannot be connected to test frameworks

Systems where much of the logic is in the visual presentation layer (GUI), because automated testing of GUIs is significantly harder than testing logic units

Batch processing systems, because they produce outputs that cannot be verified automatically

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TDD Limitation - Incomplete Test Coverage

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TDD and Multithreaded Programs

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TDD and Legacy Systems

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TDD Does Not Replace System Testing

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TDD and Test Scope

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TDD Practical Adoption

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TDD Test Suite as a Safety Net

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TDD Limitation - GUI-Heavy Systems

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