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Testing with JUnit

By : Leonard Przybylski, Frank Appel
Book Image

Testing with JUnit

By: Leonard Przybylski, Frank Appel

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Testing with JUnit
Leonard Przybylski | Frank Appel
Aug, 2015 | 200 pages
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Table of Contents (16 chapters)
Testing with JUnit
Testing with JUnit
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Getting Started
Getting Started
Why you should busy yourself with unit tests
Setting the table
Serving the starter
Understanding the nature of a unit test
Summary
2
Writing Well-structured Tests
Writing Well-structured Tests
The four phases of a unit test
Choosing the next functionality to test
Getting the test names right
Summary
3
Developing Independently Testable Units
Developing Independently Testable Units
Decomposing requirements
Understanding isolation
Working with test doubles
Increasing efficiency with mock frameworks
Using test helpers
Summary
4
Testing Exceptional Flow
Testing Exceptional Flow
Testing patterns
Treating collaborators
Summary
5
Using Runners for Particular Testing Purposes
Using Runners for Particular Testing Purposes
Understanding the architecture
Using custom runners
Writing dataset tests
Summary
6
Reducing Boilerplate with JUnit Rules
Reducing Boilerplate with JUnit Rules
Understanding rules
Working with advanced concepts
Employing custom solutions
Summary
7
Improving Readability with Custom Assertions
Improving Readability with Custom Assertions
Working with the JUnit built-in assert approach
Creating flexible expressions of intent with Hamcrest
Writing fluently readable assertions with AssertJ
Summary
8
Running Tests Automatically within a CI Build
Running Tests Automatically within a CI Build
Wrapping up the sample application
Setting up an automated CI build
Integrating code coverage reports
Summary
References
References
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Index
Index

The four phases of a unit test

Well-written unit tests follow a clean and consistent structure based on four exactly defined phases. In this section, we will learn about the purpose of each of those and delve into some subtleties of fixture setup and result verification.

Using a common test structure

 

"A tidy house, a tidy mind."

 
 --Old adage

The attentive reader may have wondered why our first test setFetchCount was segmented by the use of empty lines. To answer this question, let's have an in-depth look at each of these segments with the first listing of this section, showing the common structure of a unit test. There are minor refactorings and additional comments compared to the version in the last chapter to emphasize more on the separation.

Note

Note how the constant NEW_FETCH_COUNT replaces the literal value assigned previously to a local input variable. Literal numbers often tell little or nothing about their purpose because they emerge from nowhere like a kind of miracle. Hence, they...

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