Hello I was trying to test assertEquals() with an ArrayList. This is a part of my test code:
ArrayList<String> n = new ArrayList<String>();
n.add("a");
n.add("b");
n.add("c");
assertEquals(n, "[a, b, c]");
It looks like exactly same to me, but the junit says
junit.framework.AssertionFailedError: expected:<[a, b, c]> but was:<[a, b, c]>
Could anyone point out what I have done wrong?
You're comparing a list to a string
Try something like
List<String> expected = new ArrayList<String>();
expected.add("a");
expected.add("b");
expected.add("c");
assertEquals(expected,n);
n is a List whereas "[a, b, c]" is a string - the latter is a (possible) representation of the former but they are definitely not equal.
Comparing with a String won't work, but you don't need to create an ArrayList specifically to make the comparison, any List will do. Therefore you can use the method Arrays.asList():
assertEquals(Arrays.asList("a", "b", "c"), n);
Compare arrays instead of lists:
List<String> expected = new ArrayList<String>();
expected.add("1");
expected.add("2");
expected.add("3");
Assert.assertArrayEquals(expected.toArray(), new String[]{"1", "2", "3"});
