Assert Multiple Conditions - anastasiamexa/Healthy-Coder-App GitHub Wiki

In JUnit 5, the assertAll() method is used to assert multiple conditions in a single test, even if one of the assertions fails. This can be particularly useful when you want to check several conditions related to a single logical concept, and you want to see all the failed assertions rather than stopping at the first one.

The assertAll() method is part of the Assertions class in JUnit 5 and is typically used within a test method. Here's a basic example:

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

public class ExampleTest {

    @Test
    void testMultipleAssertions() {
        String firstName = "John";
        String lastName = "Doe";

        assertAll("person",
            () -> assertEquals("John", firstName, "First name does not match"),
            () -> assertEquals("Doe", lastName, "Last name does not match")
        );
    }
}

In this example, assertAll() is used to group multiple assertions related to a "person." If any of the assertions fail, the test will report all the failures. This is in contrast to separate assertEquals statements where the test would stop at the first failure.

The assertAll() method takes a description (a String) and a sequence of executable assertions (lambda expressions or method references) as its parameters. Each assertion is treated independently, and all the assertions are executed even if some of them fail.

It's important to note that assertAll() doesn't provide any magical recovery mechanisms. It's mainly for improved reporting so that you can see the results of all assertions in a single test, making it easier to diagnose and fix issues.

This can be particularly helpful when you have a test with multiple conditions, and you want to ensure that even if one condition fails, the test reports all the failed conditions to provide a more comprehensive overview of the issues.