book

Testing with JUnit

by Leonard Przybylski, Frank Appel

August 2015

Beginner

200 pages

4h 38m

English

Packt Publishing

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What this book covers

Downloading the example codeDownloading the color images of this bookErrataPiracyQuestions
Why you should busy yourself with unit testsReducing the defect rateImproving the code qualityIncreasing the development paceEnhancing the specification densityBoosting confidence and courage
Choosing the ingredientsOrganizing your code
Introducing the example app
Writing the first testEvaluating test resultsWriting tests first
The four phases of a unit testUsing a common test structureSetting up the fixtureWhat goes up must come downVerification
Start with the happy pathConclude with corner casesAfter the war
Test prefixBehavior-expressing patternsReducing names to the essentials
Decomposing requirementsSeparating concernsComponent dependencies
Delegating responsibilities to DOCsIndirect input and outputUnit isolation with test doubles
Placeholder dummiesFake it till you make itProviding indirect input with stubsRecording interactions with spiesVerifying behavior with mocks
The promised land?Basic stubbingIndirect output verification
MotivationThe test helper classThe test helper object
Testing patternsUsing the fail statementAnnotated expectationsVerification with the ExpectedException ruleCapturing exceptions with closures
Fail fastThe stubbing of exceptional behavior
Understanding the architectureWhat are runners good for?Looking at the big pictureWriting your own extension
Furnishing a suite with test casesStructuring suites into categoriesPopulating suites automaticallyHow about creating test doubles with annotations?
Using parameterized testsReducing glue code with JUnitParamsIncreasing the expressiveness of test descriptions with Burst
Understanding rulesWhat are JUnit rules?Writing your own ruleConfiguring the fixture with annotations
Using ClassRulesThe ordering of rule execution
Working with system settingsIgnoring tests conditionally
Working with the JUnit built-in assert approachUnderstanding the basicsReviewing the file session storageVerifying the storage behaviorImproving readability with assertion helpers
Using matcher expressionsWriting custom matchers
Employing assertion chainsCreating your own asserts
Wrapping up the sample applicationRefining the architectureSeparating concerns into modules
What is continuous integration?Principles and practicesCreating your own build
Enlarging on code coverageAutomating reporting
Chapter 1

Overview

Are you looking to ensure the code you write is robust, reliable, and testable? "Testing with JUnit" is your guide to mastering unit testing in Java using JUnit. It provides the insights and tools you need to implement effective testing strategies, ensuring high-quality software components that meet your project requirements and timelines.

What this Book will help me do

Design a highly organized test infrastructure for your Java projects.
Write efficient and neatly structured unit tests with JUnit.
Utilize JUnit runners to meet specific testing scenarios and increase adaptability.
Leverage third-party solutions to create custom assertions and enforce test clarity.
Integrate JUnit with Continuous Integration pipelines to ensure consistent code quality.

Author(s)

Leonard Przybylski and None Appel are passionate experts in the field of software testing and Java development. Leonard has a strong background in creating robust testing frameworks, while None brings valuable hands-on experience in managing high-quality software delivery projects. Together, they aim to equip developers with practical and approachable solutions to enhance their code's reliability.

Who is it for?

If you're a software developer working with Java, especially one already familiar with writing basic code but looking to strengthen your skills in writing unit tests, this book is for you. It guides intermediate Java programmers on how to incorporate JUnit into their workflow effectively. Whether your goal is to produce cleaner code or to understand how JUnit integrates with modern development practices, this book is catered to help. Gain a strong foundation and practical knowledge to face test-related challenges in your projects.