You are previewing Building and Testing with Gradle.

Building and Testing with Gradle

Cover of Building and Testing with Gradle by Tim Berglund... Published by O'Reilly Media, Inc.
  1. Building and Testing with Gradle
  2. Dedication
  3. SPECIAL OFFER: Upgrade this ebook with O’Reilly
  4. Foreword
  5. Preface
    1. Introduction
    2. Conventions Used in This Book
    3. Using Code Examples
    4. Safari® Books Online
    5. How to Contact Us
    6. Acknowledgments from Tim Berglund
    7. Acknowledgments from Matthew McCullough
  6. 1. Hello, Gradle!
    1. Build Files in Groovy
    2. Domain-Specific Build Languages
    3. Getting Started
      1. MacOS Installation with Brew
      2. Linux and MacOS Installation
      3. Windows Installation
    4. The Hello World Build File
    5. Building a Java Program
    6. The Gradle Command Line
  7. 2. Gradle Tasks
    1. Declaring a Task
    2. Task Action
    3. Task Configuration
    4. Tasks Are Objects
      1. Methods of DefaultTask
      2. Properties of DefaultTask
      3. Dynamic Properties
    5. Task Types
      1. Copy
      2. Jar
      3. JavaExec
    6. Custom Task Types
      1. Custom Tasks Types in the Build File
      2. Custom Tasks in the Source Tree
    7. Where Do Tasks Come From?
    8. Conclusion
  8. 3. Ant and Gradle
    1. The Vocabulary
    2. Hello Ant
    3. Importing Custom Ant Tasks
    4. Complex Ant Configuration
    5. Importing an Entire Ant Build File
    6. Ant Target and Gradle Task Codependence
    7. Using AntBuilder
    8. A Harmonic Duo
  9. 4. Maven and Gradle
    1. Cue Graven?
    2. The Maven POM and Gradle Build
    3. Maven Goals, Gradle Tasks
    4. The Standard Maven Coordinates, Gradle Properties
    5. More Gradle Properties
    6. Dependencies
    7. Repositories
    8. Unit Testing
    9. Multiple Source Directories
    10. Default Tasks
    11. The Maven Plug-in
    12. Installing to the Local Maven Repository (Cache)
    13. Publishing to a Maven Repository
    14. Maven2Gradle Build Script Converter
    15. Maven POM Import
    16. Conclusion
  10. 5. Testing with Gradle
    1. JUnit
    2. TestNG
    3. Spock
    4. Geb and EasyB
    5. Gradle’s Testing Focus
  11. 6. Multiproject Builds
    1. Multiproject Build Structure
    2. Project-Specific Build Files
    3. One Master Build File
    4. A Hybrid Multiproject Build
    5. Individual, Unified, or Hybrid?
    6. Multiproject Task Structure
    7. Multiple Projects Your Way
  12. About the Authors
  13. Colophon
  14. SPECIAL OFFER: Upgrade this ebook with O’Reilly
  15. Copyright
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Chapter 5. Testing with Gradle

The discussion of testing with Gradle takes two primary directions. The first is the simple testing of Java classes with existing test frameworks like JUnit and TestNG. The second is a full automation of the testing pipeline, including separating integration tests from unit test and the leveraging of more advanced testing frameworks like Spock and Geb.


The simplest JUnit example is almost entirely supplied by the java Gradle plug-in. It adds the test task to the build graph and needs only the appropriate JUnit JAR to be added to the classpath to fully activate test execution. This is demonstrated in Example 5-1.

Example 5-1. Testing Java source with JUnit

apply plugin: 'java'

repositories {

dependencies {
    testCompile 'junit:junit:4.8.2'

The report from the execution of the JUnit tests is quite handsome compared to its non-Gradle counterparts, as you can see in Figure 5-1. It offers a summary of the tests that were executed, succeeded, and failed.

JUnit Test Report

Figure 5-1. JUnit Test Report

When JUnit tests reach a certain level of proliferation within a project, there is a motivation to run them in parallel to get the results faster. However, there would be a great overhead to running every unit test in its own JVM. Gradle provides an intelligent compromise in that it offers a maxParallelForks that governs the maximum simultaneous JVMs that are spawned. ...

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