Test suites with @Suite in JUnit - Test Execution Trace

Test Overview

This test suite groups two simple test classes using JUnit's @Suite annotation. It verifies that all tests in the suite run and pass successfully.

Test Code - JUnit 5

JUnit

import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertTrue;

public class TestClassOne {
    @Test
    void testOne() {
        assertTrue(1 + 1 == 2);
    }
}

public class TestClassTwo {
    @Test
    void testTwo() {
        assertTrue("hello".startsWith("h"));
    }
}

import org.junit.platform.suite.api.SelectClasses;
import org.junit.platform.suite.api.Suite;

@Suite
@SelectClasses({TestClassOne.class, TestClassTwo.class})
public class MyTestSuite {
    // This class remains empty, used only as a holder for the above annotations
}

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts and loads MyTestSuite class	JUnit test runner initialized with suite containing TestClassOne and TestClassTwo	-	PASS
2	Test runner executes TestClassOne.testOne()	TestClassOne loaded, testOne method ready to run	assertTrue(1 + 1 == 2) verifies 2 equals 2	PASS
3	Test runner executes TestClassTwo.testTwo()	TestClassTwo loaded, testTwo method ready to run	assertTrue("hello".startsWith("h")) verifies string starts with 'h'	PASS
4	Test runner completes execution of all tests in suite	All tests in MyTestSuite executed	All assertions passed	PASS

Failure Scenario

Failing Condition: One of the test methods in the suite fails its assertion

Execution Trace Quiz - 3 Questions

What does the @Suite annotation do in this test code?

A Groups multiple test classes to run together as one suite

B Marks a single test method to be skipped

C Defines a test class as a parameterized test

D Specifies the order of test execution inside a class

Key Result

Using @Suite in JUnit helps organize multiple test classes to run together, making it easier to manage related tests and see combined results.