Integration testing

 Integration testing

Integration testing is a type of testing that involves testing the interaction between different components or modules of a software application. Integration testing ensures that the different components of the software application work together correctly. Here is an example of an integration test written in Java using the JUnit library:

java

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class CalculatorTest {

    

    @Test

    public void testAdd() {

        Calculator calculator = new Calculator();

        assertEquals(5, calculator.add(2, 3));

    }

    

    @Test

    public void testSubtract() {

        Calculator calculator = new Calculator();

        assertEquals(-1, calculator.subtract(2, 3));

    }

}

public class Calculator {

    public int add(int a, int b) {

        return a + b;

    }

    

    public int subtract(int a, int b) {

        return a - b;

    }

}

In this example, we define a class Calculator that contains two methods add and subtract that perform addition and subtraction operations, respectively. We also define a test class CalculatorTest that contains two test methods testAdd and testSubtract. The testAdd method tests the add method of the Calculator class, and the testSubtract method tests the subtract method of the Calculator class.