A very simple JUnit5 test

 A very simple JUnit test would be a case where we are testing a method or a class that has no dependency on any other class.

For example below is a simple calculator class that calculates sum of two numbers.

	package com.devnips.mockitojunit5.service;
	/**
	* A simple calculator class, with no external dependencies.
	*/
	public class SimpleCalculator {
	/**
	* Calculate sum of two numbers and return the calculates sum as response.
	*
	* @param a
	* @param b
	* @return
	*/
	public int add(int a, int b) {
	return a + b;
	}
	}

view raw SimpleCalculator.java delivered with ❤ by emgithub

To write a unit test for this method, we simply call the add method and verify the response.

	package com.devnips.mockitojunit5.service;
	import org.junit.jupiter.api.Assertions;
	import org.junit.jupiter.api.Test;
	/**
	* A simple JUnit test
	*/
	class SimpleCalculatorTest {
	private final SimpleCalculator simpleCalculator = new SimpleCalculator();
	@Test
	void test_add() {
	Assertions.assertEquals(6, simpleCalculator.add(2, 4));
	}
	}

view raw SimpleCalculatorTest.java delivered with ❤ by emgithub

This test does not require any use of Mockito framework and can be created by using just the JUnit framework.