Public class exampleCode {
  Public Integer add(Integer one, Integer two){
    return one + two;
  }
}

@isTest
private class exampleCode_Tests {
  @isTest static void test_Add_Postive() {
    exampleCode drWho = new exampleCode();
    Test.startTest();
    Integer testValue = drWho.add(5,7);
    Test.stopTest();
     System.assertEquals(12, testValue,
			‘Expected 5+7 to equal 12’);
}
