Repeated Test with RepetitionInfo. Reference: https://gist.github.com/mitchtabian/f66938b82ef711be321778e5634d18e2

ApiServiceNotifierTest.java

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.RepeatedTest;
import org.junit.jupiter.api.RepetitionInfo;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.function.Executable;

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

@DisplayName("Api Service Test")
public class ApiServiceNotifierTest {

    private MockApiServiceDouble apiServiceDouble;

    @BeforeEach
    void init(){
        apiServiceDouble = new MockApiServiceDouble();
    }

    @Test
    @DisplayName("Insert a new user using ApiServiceManager")
    void testInsertNewUser(){
        ApiServiceManager notifier = new ApiServiceManager(apiServiceDouble);

        User user = new User("Mitch", "Mitch@tabian.ca", 29);
        notifier.insertNewUser(user);

        assertEquals(1, apiServiceDouble.createdUsers.size());
        final User expectedUser = apiServiceDouble.createdUsers.get(0);

        assertAll(
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals("Mitch", expectedUser.getName());
                    }
                },
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals("Mitch@tabian.ca", expectedUser.getEmail());
                    }
                },
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals(29, expectedUser.getAge());
                    }
                }
        );

    }

    @RepeatedTest(value = 3, name = "-{displayName} -> {currentRepetition}/{totalRepetitions}")
    void testRepeatInsertUser(RepetitionInfo repetitionInfo){
        ApiServiceManager notifier = new ApiServiceManager(apiServiceDouble);

        User user = new User("Mitch", "Mitch@tabian.ca", -1);

        final long someNumber = repetitionInfo.getCurrentRepetition() + 10;
        user.setAge((int)someNumber);

        notifier.insertNewUser(user);

        assertEquals(1, apiServiceDouble.createdUsers.size());
        final User expectedUser = apiServiceDouble.createdUsers.get(0);

        assertAll(
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals("Mitch", expectedUser.getName());
                    }
                },
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals("Mitch@tabian.ca", expectedUser.getEmail());
                    }
                },
                new Executable() {
                    @Override
                    public void execute() throws Throwable {
                        assertEquals(someNumber, expectedUser.getAge());
                    }
                }
        );
    }
}