AdditionWithDataProvider.java

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

import static org.assertj.core.api.Assertions.assertThat;

public class AdditionWithDataProvider
{
	@Test(dataProvider = "additionParameters")
	public void testAddition(int a, int b, int sum)
	{
		assertThat(a + b).isEqualTo(sum);
	}

	@DataProvider(name = "additionParameters")
	public Object[][] getAdditionParameters() {
		return new Object[][] {
			{ 1, 1, 2 },
			{ 2, 2, 4 },
			{ 5, -14, -9}
		};
	}
}

AdditionWithoutDataProvider

import org.testng.annotations.Test;

import static org.assertj.core.api.Assertions.assertThat;

public class AdditionWithoutDataProvider
{
	@Test
	public void testOnePlusOne()
	{
		assertThat(1 + 1).isEqualTo(2);
	}

	@Test
	public void testTwoPlusTwo()
	{
		assertThat(2 + 2).isEqualTo(5);
	}

	@Test
	public void testFivePlusNegativeFourteen()
	{
		assertThat(5 + -14).isEqualTo(-9);
	}
}