Optional Message Paramater causing error

Try this, it works for me in JUnit 5 (message is on the last place, not first):

assertEquals(1, loc.getRow(), "proper row");

assertEquals(3, loc.getColumn(), "proper column");

Not an expert but I was having the same issue, I think one of the main differences is that I was using JUnit 5 Jupiter and its imports and Craig uses JUnit 4. Using the right imports and annotations helped fix the issue for me.

I think it will work if you use these imports ( which I think comes from JUnit 4) :

   import org.junit.Before;
   import org.junit.Test;
   import static org.junit.Assert.assertEquals;

Here is my code (with the annotations I also used) :

class AlphaNumericChooserTest {

 private AlphaNumericChooser chooser;

 @Before
 void setUp() throws Exception {
     chooser = new AlphaNumericChooser(26, 10);
 }

 @org.junit.Test
 void validInputReturnsProperLocation() throws Exception {
     AlphaNumericChooser.Location loc = chooser.locationFromInput("B4");

     assertEquals( "proper row" , 1, loc.getRow());
     assertEquals( "proper column" , 3, loc.getColumn());
 }
}

I'm a beginner and late for answering, but I hope this helps if someone gets here. I'm using JUnit 5 and optional message parameters seem to cause problems when running the tests, so I deleted them and found out that once you run the tests, the method which doesn't pass will be dotted underlined. So if I try with:

assertEquals(2, loc.getRow()); assertEquals(3, loc.getColumn());

the first method will be underlined.