Create a Java project for IDEA



Write a class with an Add method



To Generate the test class, right-click on the class name and select Generate



Select the Test Test class



Prompt to create the root of the test class



The junit5 jar package was not found. Click Fix to Fix the problem



Prompt to download in the warehouse



Download complete, no more problems with this package. You can choose either the add method or the setUp/ @before method



If a message is displayed indicating that the class is not found and you need to import the class, press Alt +Enter on the red class name to import the specified package.



Select the 5.3 package.



The code for the test class is as follows:

import static org.junit.jupiter.api.Assertions.*;

class MainTest {

    @org.junit.jupiter.api.BeforeEach
    void setUp(a) {}@org.junit.jupiter.api.Test
    void add(a) {
        assertEquals(2.new Main().add(1.1)); }}Copy the code

The successful running