assertAll for grouped assertions in JUnit - Test Execution Trace

Test Overview

This test checks multiple properties of a Person object using assertAll to group assertions. It verifies the name, age, and email in one test run.

Test Code - JUnit 5

JUnit

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

class Person {
    private String name;
    private int age;
    private String email;

    Person(String name, int age, String email) {
        this.name = name;
        this.age = age;
        this.email = email;
    }

    String getName() { return name; }
    int getAge() { return age; }
    String getEmail() { return email; }
}

public class PersonTest {

    @Test
    void testPersonProperties() {
        Person person = new Person("Alice", 30, "[e-mail]");

        assertAll("person properties",
            () -> assertEquals("Alice", person.getName()),
            () -> assertEquals(30, person.getAge()),
            () -> assertTrue(person.getEmail().contains("@"))
        );
    }
}

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts	JUnit test runner initialized	-	PASS
2	Creates Person object with name 'Alice', age 30, email '[e-mail]'	Person instance in memory with given properties	-	PASS
3	Runs assertAll grouping three assertions	Assertions prepared for name, age, and email	Check name equals 'Alice', age equals 30, email contains '@'	PASS
4	Each assertion runs inside assertAll	Assertions executed sequentially	assertEquals("Alice", person.getName()) passes	PASS
5	Second assertion runs	Checking age	assertEquals(30, person.getAge()) passes	PASS
6	Third assertion runs	Checking email contains '@'	assertTrue(person.getEmail().contains("@")) passes	PASS
7	assertAll completes, test ends	All grouped assertions passed	Grouped assertions all passed	PASS

Failure Scenario

Failing Condition: One or more assertions inside assertAll fail, e.g., email does not contain '@'

Execution Trace Quiz - 3 Questions

What does assertAll do in this test?

A Stops test at first failed assertion

B Runs all assertions and reports all failures together

C Skips assertions if the first one passes

D Runs only one assertion randomly

Key Result

Using assertAll groups multiple assertions so you see all failures at once, making debugging easier and tests more informative.