Test List<List<T>> contains the same items in any order

Question

I want to compare two List<List<String>> that contain the same elements in any order. They are not equal.

// expectedResult 
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]

the other is

// result
[
  ["eat", "tea", "ate"], 
  ["bat"], 
  ["tan", "nat"]
]

What test methods (from which libraries) should I use to compare elements inside **elements without sorting ?**

I tried this unsuccessfully.

import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
import static org.junit.Assert.assertThat;

assertThat(expectedResult, containsInAnyOrder(result));

Answer 1

The method .containsAll() works for a Collection not for a Collection of Collection.

Basically I ended up comparing each elements of the first collection, then use .containsAll() for the nested collection.

import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
import java.util.List;

    @Test
    public void groupAnagramsTest() {
        List<List<String>> expectedResult = Arrays.asList(Arrays.asList("bat"), Arrays.asList("nat", "tan"), Arrays.asList("ate", "eat", "tea"));
        List<List<String>> result = Arrays.asList(Arrays.asList("bat"), Arrays.asList("tan", "nat"), Arrays.asList("tea", "eat", "ate"));

        // to test the equality without order, 
        // assert that all elements are contained in the compared list and vice versa
        for (int i = 0; i < result.size(); i++) {
            Assert.assertTrue(expectedResult.get(i).containsAll(result.get(i)));
            Assert.assertTrue(result.get(i).containsAll(expectedResult.get(i)));
        }
    }

NOTE: the order of the outer List is the same between the two. Otherwise it won't work.