How to test an .equals() method using JUnit and Hamcrest

Question

I have a class List (EDIT: that I wrote myself), with method List.equals, so I want to run something like

List list1 = new List();
List list2 = new List();
assertTrue(list1.equals(list2));

So using matchers and assertThat, I thought maybe

assertThat(list1.equals(list2), is(true));

But this is getting pretty silly...EDIT: perhaps I can write my own matcher

Is there a better way to check if my equals method is working correctly?

This is with JUnit4.5

samlewis · Accepted Answer · 2013-07-11T22:35:29.380

11

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.MatcherAssert.assertThat;    

...

assertThat(list1, equalTo(list2));

edited Jul 11 '13 at 22:35

answered Jul 11 '13 at 22:26

samlewis

That's what I needed, it calls the .equals method automatically, I didn't realize that was an option. – Henry Jul 12 '13 at 05:03
5

The `is` matcher is also a synonym for `equalTo`. – David Harkness Jul 13 '13 at 17:03

score 1 · Answer 2 · answered Jul 11 '13 at 23:14

1

assertEquals(list1, list2) is the most straightforward way.

answered Jul 11 '13 at 23:14

Tim Boudreau

8

The question is about Hamcrest. – samlewis Jul 11 '13 at 23:20
If this assert fails, the message would be quite convoluted. – Olaf Jul 12 '13 at 20:54

2 Answers2