The technical principle analysis of the Junit Vintage Engine framework in the Java class library
Analysis of the technical principles of Junit Vintage Engine framework in the Java Library
Overview:
Junit is a widely used Java unit testing framework, providing developers with a convenient way to write and perform testing.Junit Vintage Engine is a sub -project in Junit 5, which allows developers to run the old version of the Junit test on the Junit 5 platform.This article will analyze the technical principles of the Junit Vintage Engine framework and provide some Java code examples to illustrate its usage.
The technical principle of the Junit Vintage Engine framework:
Junit Vintage Engine is a engine built on the Junit Jupiter engine. Through this engine, we can run the old version of Junit 3 and Junit 4 on the Junit 5 platform.This is very useful for those who still use the old version of Junit. You can perform testing on the new Junit 5 platform without modifying the existing test code.
Junit Vintage Engine's technical principles are achieved by adapter mode.It provides adapter classes to allow the tests of Junit 3 and Junit 4 on the platform of Junit 5.These adapter classes act as the appearance of the Junit 5 engine, and forward the tested calls from Junit 3 and Junit 4 to the code of Junit Vintage Engine for processing.There are two main types of adapters: Junit3adapter and Junit4adapter.
The Junit3adapter class is a adapter used by Junit Vintage Engine to run the Junit 3 test.It implements the Testengine interface in the Junit Jupiter engine and rewritten the method to adapt to the Junit 3 test.When the test class of Junit 3 is passed to Junit Vintage Engine, Junit3adapter will perform the running of the Junit 3 test.
Here are a sample code that uses Junit Vintage Engine to run Junit 3 tests:
import junit.framework.TestCase;
import org.junit.runner.JUnitCore;
public class SimpleJunit3Test extends TestCase {
public void testAddingTwoNumbers() {
int sum = 1 + 2;
assertEquals(3, sum);
}
}
public class TestRunner {
public static void main(String[] args) {
JUnitCore.runClasses(SimpleJunit3Test.class);
}
}
The Junit4adapter class is a adapter used by Junit Vintage Engine to run the Junit 4 test.It implements the Testengine interface in the Junit Jupiter engine and rewritten the method to adapt to the Junit 4 test.When Junit 4's test class is passed to Junit Vintage Engine, Junit4adapter will perform the running of the Junit 4 test.
Here are a sample code that uses Junit Vintage Engine to run Junit 4 test:
import org.junit.Test;
import static org.junit.Assert.*;
public class SimpleJunit4Test {
@Test
public void testAddingTwoNumbers() {
int sum = 1 + 2;
assertEquals(3, sum);
}
}
public class TestRunner {
public static void main(String[] args) {
JUnitCore.runClasses(SimpleJunit4Test.class);
}
}
By using Junit Vintage Engine, we can use the old version of the Junit test to run and manage in the environment of Junit 5.This gives the project a greater flexibility for the process of migrating to Junit 5 and reduced the modification of the test code.
in conclusion:
Junit Vintage Engine framework is a powerful tool for running the old version of the Junit test on the Junit 5 platform.It can be implemented through the adapter mode that allows us to run the existing Junit 3 and JUNIT 4 test code to run them in the Junit 5 environment.This provides more flexibility and convenience for the project migration to Junit 5.
