@Tag for categorization in JUnit - Test Execution Trace

Test Overview

This test uses the @Tag annotation to categorize tests. It verifies that a simple addition method returns the correct result.

Test Code - JUnit

JUnit

import org.junit.jupiter.api.Tag;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;

public class CalculatorTest {

    @Tag("math")
    @Test
    void testAddition() {
        int result = add(2, 3);
        assertEquals(5, result, "2 + 3 should equal 5");
    }

    int add(int a, int b) {
        return a + b;
    }
}

Execution Trace - 5 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts and identifies tests with @Tag("math")	JUnit test environment ready, CalculatorTest loaded	-	PASS
2	JUnit runs testAddition() method	Inside testAddition method, variables initialized	-	PASS
3	Calls add(2, 3) method	add method executes and returns 5	-	PASS
4	Assert that result equals 5	Result is 5, expected is 5	assertEquals(5, result)	PASS
5	Test completes successfully	Test marked as passed in report	-	PASS

Failure Scenario

Failing Condition: The add method returns incorrect result (e.g., 4 instead of 5)

Execution Trace Quiz - 3 Questions

What is the purpose of the @Tag("math") annotation in this test?

A To mark the test as ignored

B To categorize the test for selective execution

C To specify the test method name

D To set the test timeout

Key Result

Using @Tag allows you to group and run specific categories of tests easily, improving test management and execution control.