In this guide, we'll dive into how to execute tests using Gradle.
Prerequisites
- A Java project set up with Gradle.
- Gradle installed on your machine or the Gradle Wrapper included in your project.
- Some test cases are written (e.g., using JUnit or TestNG) within your project.
Running All Tests
1. Navigate to your project directory
Open your terminal or command prompt and go to the root directory of your Gradle project.
2. Execute the test task
Run the following command:
gradle test
If you're using the Gradle Wrapper (often recommended for consistent builds):
./gradlew test
For Windows:
gradlew.bat test
Inspecting the Results
By default, Gradle will generate a report once all tests are executed. You can find this report in HTML format at build/reports/tests/test/index.html. Open it in any web browser to view a detailed overview of all executed tests, including those that passed and failed.
Running Specific Tests
If you only want to run a subset of your tests, you can do so using the --tests flag:
gradle test --tests com.example.MyTestClass
Replace com.example.MyTestClass with the full name of the test class you want to run. To run specific methods within a test class:
gradle test --tests com.example.MyTestClass.myTestMethod
Wildcards can also be used:
gradle test --tests com.example.* // will run all tests in the com.example package
Continuous Test Execution
Gradle allows for continuous testing which means it will keep running in the background, watching for changes in your files, and re-run tests when it detects changes. This can be activated using the -t flag:
gradle test -t
Conclusion
Running tests with Gradle is a breeze. The tool offers flexibility, allowing developers to run all tests, specific tests, or even enable continuous testing. This makes the feedback loop shorter, and errors can be caught early during development. With the test reports generated, one can also get an overview of the project's test health. Always remember that consistent testing leads to more reliable software.
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