Understanding Code Deterioration and Unit Testing
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Questions and Answers

What is the minimum percentage of recycled paper used in Manning books?

  • 15% (correct)
  • 10%
  • 20%
  • 25%

Who is listed as the acquisitions editor for Manning Publications?

  • Mike Stephens (correct)
  • Sam Zaydel
  • Tiffany Taylor
  • Marina Michaels

Which of the following statements is true regarding the reproduction of the publication?

  • Reproduction is allowed without any restrictions.
  • Only electronic reproduction is permitted.
  • It can be reproduced freely.
  • Written permission is required for reproduction. (correct)

What is the primary focus of Manning Publications' printing policy?

<p>To use acid-free paper and recycled materials. (B)</p> Signup and view all the answers

Where should inquiries regarding quantity discounts be directed?

<p>Special Sales Department (A)</p> Signup and view all the answers

What is the purpose of the contact information provided for Manning Publications?

<p>To inquire about bulk order discounts. (D)</p> Signup and view all the answers

Which title indicates a role involved in the technical editing process?

<p>Development editor (D)</p> Signup and view all the answers

Which of the following designations is NOT mentioned as a specific editor's role?

<p>Project manager (B)</p> Signup and view all the answers

What is the main focus when performing unit testing according to the guidelines?

<p>Focusing on the domain model (B)</p> Signup and view all the answers

Which of the following is considered a non-critical part of the codebase?

<p>External services and dependencies (D)</p> Signup and view all the answers

What is the challenge related to unit testing mentioned in the content?

<p>Maximizing value with minimum maintenance costs (B)</p> Signup and view all the answers

Which of the following actions is NOT recommended when focusing on unit testing?

<p>Overlapping test responsibilities in different modules (B)</p> Signup and view all the answers

What distinguishes recognizing a valuable test from writing one?

<p>Recognizing requires a frame of reference (A)</p> Signup and view all the answers

What is typically included in the category of infrastructure code?

<p>Databases (B)</p> Signup and view all the answers

What must be ensured when maintaining a suite of tests?

<p>Only essential tests should be kept (D)</p> Signup and view all the answers

Which of the following best describes the importance of unit testing the domain model?

<p>It helps isolate and manage complexities in the core logic (D)</p> Signup and view all the answers

What is the primary purpose of writing unit tests in software development?

<p>To enable sustainable growth of the software project (C)</p> Signup and view all the answers

Which of the following styles of testing is specifically mentioned as a topic covered in the book?

<p>Integration tests (A)</p> Signup and view all the answers

What is a significant consequence of having bad unit tests or no tests at all?

<p>Stagnation or increased regressions with software releases (D)</p> Signup and view all the answers

Which of the following best describes the role of tests in relation to code entropy?

<p>Tests serve as a safety net to counteract code entropy (C)</p> Signup and view all the answers

What is advised for managing the tests in a test suite?

<p>Only retain tests that provide a positive net value (D)</p> Signup and view all the answers

Which kind of tests does the book specifically NOT emphasize as part of automated testing?

<p>Performance testing (C)</p> Signup and view all the answers

What is described as a good litmus test for code in relation to unit testing?

<p>The ability to write and execute unit tests (C)</p> Signup and view all the answers

What is one of the actions recommended to maintain a clean and efficient codebase?

<p>Regularly clean and refactor both the application and test code (B)</p> Signup and view all the answers

What is the code coverage percentage after refactoring the method to inline the unnecessary if statement?

<p>100% (C)</p> Signup and view all the answers

What remains unchanged in the test suite after refactoring the method?

<p>The number of possible outcomes being verified (C)</p> Signup and view all the answers

Which statement best describes branch coverage compared to code coverage?

<p>It provides more precise results by focusing on control structures. (C)</p> Signup and view all the answers

How is branch coverage calculated?

<p>Branches exercised by tests divided by total number of branches. (B)</p> Signup and view all the answers

Why might more compact code result in better test coverage metrics?

<p>It has fewer lines to account for. (B)</p> Signup and view all the answers

What is a limitation of code coverage as a metric?

<p>It focuses solely on the number of lines executed. (D)</p> Signup and view all the answers

Which type of statements are particularly important for branch coverage?

<p>Control structures such as if and switch statements (B)</p> Signup and view all the answers

What is a potential issue when interpreting code coverage metrics?

<p>High coverage always implies high test quality. (D)</p> Signup and view all the answers

What is one primary benefit of using interfaces when dealing with out-of-process dependencies?

<p>They enable loose coupling. (A)</p> Signup and view all the answers

In integration testing, what is crucial to ensure when testing logging functionality?

<p>The logging mechanism does not affect performance. (A)</p> Signup and view all the answers

What is a recommended best practice when writing integration tests?

<p>To reduce the number of layers involved. (D)</p> Signup and view all the answers

What is a disadvantage of using mocks in testing?

<p>They can lead to false sense of security. (A)</p> Signup and view all the answers

What is one method recommended for handling dependencies in integration tests?

<p>Test dependencies in isolation. (D)</p> Signup and view all the answers

What should be considered when testing the database?

<p>Keep the database schema alongside data. (B)</p> Signup and view all the answers

When verifying interactions in testing, what should you avoid?

<p>Verifying calls to all components. (C)</p> Signup and view all the answers

Which aspect is crucial to testing logging functionality?

<p>Determining how much logging is sufficient. (B)</p> Signup and view all the answers

What is a common recommendation regarding the use of mocks in tests?

<p>Use multiple types of mocks across tests. (B)</p> Signup and view all the answers

What is a suggested practice to avoid circular dependencies in testing?

<p>Making domain model boundaries explicit. (C)</p> Signup and view all the answers

Flashcards

Minimum recycled paper percentage for Manning books

Manning books use at least 15% recycled paper.

Acquisitions editor for Manning

Mike Stephens manages new book acquisitions.

Reproduction permission

Written permission is needed to reproduce Manning publications.

Manning's printing policy

Manning uses acid-free paper and recycled materials.

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Quantity discount inquiries

Contact the Special Sales Department for bulk order discounts.

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Purpose of Manning contact info

To inquire about bulk orders and discounts.

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Technical editing role

A development editor is a role in the technical editing process.

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Non-editor role

Project manager is not a specific editor role, mentioned in the context.

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Unit testing focus

Unit testing focuses on the domain model to manage complexity.

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Non-critical code parts

External services and dependencies are not a critical part of code.

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Unit testing challenge

Maximizing value with minimum testing maintenance cost.

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Avoidable testing action

Do not overlap test responsibilities in different modules.

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Value recognition vs. writing tests

Recognizing valuable tests needs a frame of reference.

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Infrastructure code

Databases usually fall under the category of infrastructure code.

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Maintaining test suites

Only essential tests should be kept in a test suite.

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Domain model testing importance

Testing the domain model helps isolate and manage core logic.

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Unit testing purpose

Enable sustained growth and development of software projects.

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Testing style covered

Integration tests are a testing style addressed in the book.

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Consequence of bad/no tests

Bad or no unit tests can lead to stagnation or regressions during software releases.

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Tests and code entropy

Tests act as a safeguard against code complexity.

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Managing test suite

Only tests providing positive net value should remain in the test suite.

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Non-emphasized testing type

Performance testing is not the primary focus of automated testing covered.

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Code quality litmus test

Ability to write and execute unit tests is a good indicator of code quality.

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Maintaining a codebase

Refactor the application and test code regularly to maintain cleanliness.

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Refactoring code coverage

Code coverage achieved 100% after inlining unnecessary statement.

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Test suite change after refactoring

Possible outcomes being verified remain unchanged in the test suite after refactoring.

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Branch coverage vs. code coverage

Branch coverage is more accurate than code coverage, focusing on control structures.

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Branch coverage calculation

Calculated as the ratio of exercised branches to total branches.

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Compact code and test coverage

Compact code may result in better test coverage because of fewer lines.

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Code coverage limitation

Code coverage only looks at executed lines, not overall quality.

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Branch coverage statements

If and switch statements are important for branch coverage.

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Code coverage interpretation

High coverage doesn't guarantee good test quality.

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Interfaces and out-of-process dependencies

Interfaces enable loose coupling when dealing with external dependencies.

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Logging testing in integration

Ensure logging mechanisms in integration testing don't impact performance.

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Best practice in integration testing

Reduce the number of layers involved in integration testing.

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Disadvantage of mocks

Mocks can create a false sense of security in testing.

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Handling dependencies in integration

Test dependencies in isolation to avoid coupling issues.

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Database testing consideration

Keep the database schema alongside testing data.

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Verifying interactions

Avoid verifying calls to all components during testing.

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Testing logging sufficiency

Determine the right level of logging required to satisfy testing needs.

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Multiple mock types

Using various mock types within tests is recommended.

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Avoiding circular dependencies

Make clear boundaries for domain models to prevent circular dependencies.

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Study Notes

Understanding Code Deterioration

  • Code deteriorates over time, increasing in disorder (entropy) with each change.

  • This leads to complexity and disorganization, impacting the sustainability of the project.

Importance of Good Unit Tests

  • Unit tests act as a safety net, preventing regressions and ensuring the code's functionality remains intact.

  • Writing good unit tests is crucial, as bad tests can lead to project stagnation or regressions.

The Goal of Unit Testing

  • To enable sustainable growth in a software project.

  • A good unit test suite allows for consistent development pace by preventing regressions.

  • This ensures the project's ability to refactor code, add new features, and maintain stability.

Evaluating Test Value

  • Each test carries a cost and a benefit.

  • Prioritize tests with positive net value, eliminating those with low value.

  • Both application and test code are liabilities, and excessive code should be avoided.

The Litmus Test of Unit Testability

  • Unit testability is a key indicator of clean and well-structured code.

  • While unit testability is a positive sign, it's only effective in one direction.

  • It's important to ensure that code can be readily tested, not just that it's currently being tested.

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Related Documents

Principles, Practices, and Patterns of Unit Testing PDF

Description

This quiz explores the concept of code deterioration over time and the critical role of good unit tests in maintaining project sustainability. It highlights the importance of prioritizing tests that provide value and outlines the goal of unit testing in enabling consistent development. Assess your knowledge and understanding of these key software development concepts.

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