In -depth understanding of the technical principles of Junit Platform Launcher framework
In -depth understanding of the technical principles of Junit Platform Launcher framework
Junit is one of the most popular unit testing frameworks in the field of Java development, but in the Java class library, Junit Platform also provides a Launcher framework to provide technical support for the dynamic execution of testing.This article will explore the technical principles of the Junit Platform Launcher framework, including its internal working principles and code examples.
The principle of the Junit Platform Launcher framework mainly involves the following aspects:
1. Project structure and dependence: Junit Platform Launcher framework is composed of multiple core components. The core components include the Junit Platform engine, the Junit Jupiter engine and the Junit Vintage engine.Before using the Junit Platform Launcher framework, you need to ensure that the Junit Platform Launcher dependencies are introduced in the project.
2. Execute the test plan: The main function of the Junit Platform Launcher framework is to perform the test plan, that is, dynamically load and execute test cases according to the user's configuration and input.The test plan can be configured through the Junit Platform API, including specified test engines, testing, test methods, etc.
3. Engine discovery and loading: Junit Platform Launcher framework can be found and loaded different test engines. These engines can be the Junit Jupiter engine (used to perform test cases based on the Junit Jupiter framework), Junit Vintage engine (for executing Junit -based based on4 Test examples of framework) or other custom engines.These engines need to be loaded during the runtime of testing so that Junit Platform can adapt to different types of testing.
4. Test operator: The test operator is one of the core components of the Junit Platform Launcher framework. It is responsible for loading and executing the test class and testing methods.The test operator was performed by the API interface provided by the test engine and reported the test results to the Junit Platform.
Below is a simple Junit Platform Launcher framework example:
import org.junit.platform.launcher.Launcher;
import org.junit.platform.launcher.core.LauncherFactory;
import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
import org.junit.platform.launcher.listeners.TestExecutionSummary;
public class JUnitPlatformLauncherExample {
public static void main(String[] args) {
Launcher launcher = LauncherFactory.create();
SummaryGeneratingListener listener = new SummaryGeneratingListener();
launcher.registerTestExecutionListeners(listener);
launcher.execute(request -> {
request.selectors(
request.selectPackage("com.example.tests"),
request.selectClass(MyTest.class)
);
request.filters(
includeClassNamePatterns(".*Tests"),
excludeClassNamePatterns(".*IntegrationTests")
);
});
TestExecutionSummary summary = listener.getSummary();
System.out.println(summary.getTestsFoundCount());
System.out.println(summary.getTestsSucceededCount());
System.out.println(summary.getTestsFailedCount());
}
}
In the above example, we created a Junit Platform Launcher instance and registered a SummarygenratingListener to obtain the abstract information of the test execution.Then, we select the test or test packets to be executed through the request.seletors () method, and can use the request.filters () method to set some filtering rules.Finally, we execute the test plan by calling the Launcher.execute () method, and obtain the abstract information of the execution through the Listener.getsumMary () method.
Through the introduction of this article, we understand the technical principles of the Junit Platform Launcher framework, including project structure and dependence, testing planning, engine discovery and loading, and testing operators.The Junit Platform Launcher framework provides a more flexible and efficient unit test framework for Java developers, which can better support the automation and continuous integration of testing in actual projects.
