Failure notification setup in JUnit - Test Execution Trace

Test Overview

This test checks that a failure notification is sent when a test fails. It verifies the notification system triggers correctly on test failure.

Test Code - JUnit 5

JUnit

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.junit.jupiter.api.extension.TestWatcher;
import org.junit.jupiter.api.extension.ExtensionContext;
import static org.junit.jupiter.api.Assertions.assertEquals;

class FailureNotificationExtension implements TestWatcher {
    private static boolean notificationSent = false;

    @Override
    public void testFailed(ExtensionContext context, Throwable cause) {
        notificationSent = true;
        System.out.println("Failure notification sent for test: " + context.getDisplayName());
    }

    public boolean isNotificationSent() {
        return notificationSent;
    }
}

@ExtendWith(FailureNotificationExtension.class)
public class FailureNotificationTest {

    // Changed to static to reflect the static notificationSent flag
    static FailureNotificationExtension extension = new FailureNotificationExtension();

    @Test
    void testThatFails() {
        assertEquals(1, 2, "This test is designed to fail");
    }

    @Test
    void verifyNotificationSent() {
        // This test runs after testThatFails to check notification
        assertEquals(true, extension.isNotificationSent(), "Notification should be sent on failure");
    }
}

Execution Trace - 4 Steps

Step	Action	System State	Assertion	Result
1	Test runner starts and loads FailureNotificationTest class	JUnit test environment initialized	-	PASS
2	Runs testThatFails method	Test method executing	assertEquals(1, 2) fails	FAIL
3	FailureNotificationExtension.testFailed called with test context and failure cause	Notification flag set to true, message printed	-	PASS
4	Runs verifyNotificationSent method	Test method executing	assertEquals(true, extension.isNotificationSent()) verifies notification was sent	PASS

Failure Scenario

Failing Condition: FailureNotificationExtension.testFailed method is not called on test failure

Execution Trace Quiz - 3 Questions

What causes the failure notification to be sent in this test?

A A test method fails an assertion

B A test method passes successfully

C The test class is loaded

D The notification is sent manually in the test

Key Result

Use JUnit extensions like TestWatcher to hook into test lifecycle events and trigger actions such as failure notifications automatically.