JUnit 5 assertAll as Executable

Example.java

package tld.example;
import org.junit.jupiter.api.function.Executable;
import org.junit.Test;
import static org.junit.jupiter.api.Assertions.assertAll;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class Example {
    @Test
    public void example() {
        assertAll("parent",
            () -> assertEquals("1", "2"),
            () -> nestedAssertAll()
        );
    }
    private Executable nestedAssertAll() {
        return () -> assertAll("nested",
            () -> assertEquals("true", "false")
        );
}