public class Calculator {

    public double add(double number1, double number2) {

        return number1 + number2;

    }

}

import static org.junit.Assert.*;

import junit.framework.Assert;

import org.junit.Test;

public class CalculatorTest {

    @Test

    public void testAdd() {

        Calculator calculator = new Calculator();

        double result = calculator.add(10, 50);

        assertEquals(60, result, 0);

    }

}

import static org.junit.Assert.assertEquals;

import java.util.Arrays;

import java.util.Collection;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.junit.runners.Parameterized;

import org.junit.runners.Parameterized.Parameters;

@RunWith(value=Parameterized.class)

public class ParameterizedCalculatorTest {

    private double expected;

    private double valueOne;

    private double valueTwo; 

    @Parameters

    public static Collection<Integer[]> getTestParameters() {

       return Arrays.asList(new Integer[][] {

          {2, 1, 1},  //expected, valueOne, valueTwo

          {3, 2, 1},  //expected, valueOne, valueTwo

          {4, 3, 1},  //expected, valueOne, valueTwo

       });

    }

    public ParameterizedCalculatorTest(double expected,

       double valueOne, double valueTwo) {

       this.expected = expected;

       this.valueOne = valueOne;

       this.valueTwo = valueTwo;

    }

    @Test

    public void sum() {

       Calculator calc = new Calculator();

       assertEquals(expected, calc.add(valueOne, valueTwo), 0);

    }

}