How to call method in java test class

The process of calling methods by test classes is usually carried out through the tools and annotations provided by the testing framework (such as JUnit). Calling method: 1. Create an instance of MyClass myClass; 2. Call the multiply method and use assertions to verify whether the return value of the method meets expectations.

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

In Java, the process of calling methods by a test class is usually carried out through the tools and annotations provided by the test framework (such as JUnit). The following is an example that shows how to write a simple test class and call the methods in it:

Suppose there is a class MyClass with a method multiply that needs to be tested:

public class MyClass {
    public int multiply(int a, int b) {
        return a * b;
    }
}

Then , you can use JUnit to write a test class, call the multiply method and verify its behavior:

import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
public class MyClassTest {
    @Test
    public void testMultiply() {
        // 创建被测试的对象
        MyClass myClass = new MyClass();
        // 调用被测试方法
        int result = myClass.multiply(3, 4);
        // 使用断言验证结果
        Assertions.assertEquals(12, result, "3 * 4 should equal 12");
    }
}

In this example, the MyClassTest class uses the @Test annotation to mark a test method testMultiply. In this method, an instance of MyClass myClass is first created, then the multiply method is called, and finally assertions (Assertions.assertEquals) are used to verify whether the return value of the method is as expected.

In the integrated development environment (IDE), you can run this test class, and the test framework will execute the test method marked with @Test annotation and provide test results.

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