How to write java test class

Java test class writing method: 1. Use the JUnit framework to write a test class named MyTest; 2. Define a test method named testMyMethod, which is used to test the myMethod method of the MyClass class; 3. In the In the method, an instance object obj of the MyClass class is created, and then the assertEquals method provided by JUnit is used to assert whether the return value of the obj.myMethod() method is equal to the expected value.

Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Java test classes are usually used to test the correctness and reliability of Java classes or methods. Here is an example of a simple Java test class:

java

import org.junit.Test;  
import static org.junit.Assert.*;  
  
public class MyTest {  
  
    @Test  
    public void testMyMethod() {  
        MyClass obj = new MyClass();  
        assertEquals("Expected value", obj.myMethod());  
    }  
}

at In the above code, we used the JUnit framework to write a test class named MyTest. In this class, we define a test method named testMyMethod, which is used to test the myMethod method of the MyClass class. In this method, we first create an instance object obj of the MyClass class, and then use the assertEquals method provided by JUnit to assert whether the return value of the obj.myMethod() method is equal to the expected value.

In the actual test class, you can write multiple test methods as needed to test different classes or methods. At the same time, you can also use other annotations and assertion methods provided by JUnit, such as @Before, @After, @Ignore, assertTrue, assertFalse, etc., to conduct testing more flexibly.

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