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Thread: JUnit AssertEquals

  1. #1
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    Post JUnit AssertEquals

    Hey,

    I am doing a Junit test case, but I keep having issues with AssertEquals ( object expected, object actual).
    I don't know how to reference the other actual object so that it can compare to the expected. Please help, I am stuck
    public void add (Distance d) throws CustomException
    	{
     
    		//I can also convert feet to inches and add all inches together and then divided inches to feet and inches
    		Distance result = new Distance();
    		int newFeet = this.feet + d.getFeet();
    		int newInches = this.inches + d.getInches();
    		if(newInches > 11)
    		{
    			newFeet = newFeet + (newInches/12);
    			newInches = newInches % 12;
    		}
    		result.setFeet(newFeet);
    		result.setInches(newInches);
     
    		System.out.println("Addition: " + result);
    	}
    public class DistanceTest 
    {
     
    	@Test
    	public void testAdd() 
    	{
    //		Distance num = new Distance (5,5);
    //		Distance test = new Distance (5,5);
    		Distance result = new Distance (10,10);
    		assertEquals(result,num.add(test));
    		//API uses assertEquals(object expected, object actual)
    	}


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    Default Re: JUnit AssertEquals

    I'm not sure what you mean by "having issues," so I'll provide general guidance. The use of 'object' may have been a bad choice of words, but we'll look beyond that. The expected item could be as simple as precomputed constant, String, or boolean. For example, you can calculate in advance that 5 + 5 = 10, so to test a method that adds two numbers called myAdd( int x, int y ), you might use assertEquals() like:

    assertEquals( 10, myAdd( 5, 5 ) );

    Please come back and clarify what help you need if this doesn't clear it up for you.

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    Default Re: JUnit AssertEquals

    Quote Originally Posted by GregBrannon View Post
    I'm not sure what you mean by "having issues," so I'll provide general guidance. The use of 'object' may have been a bad choice of words, but we'll look beyond that. The expected item could be as simple as precomputed constant, String, or boolean. For example, you can calculate in advance that 5 + 5 = 10, so to test a method that adds two numbers called myAdd( int x, int y ), you might use assertEquals() like:

    assertEquals( 10, myAdd( 5, 5 ) );

    Please come back and clarify what help you need if this doesn't clear it up for you.
    That is my problem, my add method only takes in one parameter not two, would you suggest switching up my add and subtract method to taking it two parameters, so that I can make the assertEquals work?
    currently I have
    add(Distance d)
    should I switch it to
    add (distance a, distance b)
    I think that would solve the problem?
    thanks greg

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    Default Re: JUnit AssertEquals

    Your add method doesn't return anything and doesn't modify the original object. How can you check anything? Everything you do in the add method is lost the second the method ends. If you want to check the result of the add method, you need to return a result.
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