CODEWITHSUNDEEP
javajunit4assertassertions
Anuja
Anuja

Reputation: 115

How to use assertNotEquals for 2 lists of different size

I'm trying to assert two List of Strings having different number of elements. I'm testing an application and my goal is to Fail a test case if the Actual list contains even one element that matches the Expected list.

I have tried below approaches but none of these suffice my requirement. 

List<String> expected = Arrays.asList("fee", "fi", "foe", "foo");
List<String> actual = Arrays.asList("feed", "fi"); 
assertThat(actual, not(equalTo(expected)));`

I want this comparision yo fail since there is 1 element in actual list which matches the expected one. 

Assert.assertNotEquals(actual,expected);
assertThat(actual, is(not(expected)));
Assert.assertNotEquals(actual, containsInAnyOrder(expected));

None of these work. Any help would be appreciated.

Upvotes: 0

Views: 1940

Answers (4)

Dawood ibn Kareem
Dawood ibn Kareem

Reputation: 79876

This is a one-liner.

Assert.assertTrue(Collections.disjoint(list1, list2));

The disjoint method returns true if its two arguments have no elements in common.

It helps to know the libraries that come with the JDK. See http://docs.oracle.com/javase/8/docs/api/java/util/Collections.html#disjoint-java.util.Collection-java.util.Collection-

Upvotes: 1

Vasu
Vasu

Reputation: 22442

You can do this by using assertFalse if any of the elements of actual list matches with any element in expected list as below:

    @Test
    public void test() throws Exception{
        List<String> expected = Arrays.asList("fee", "fi", "foe", "foo");
        List<String> actual = Arrays.asList("feed", "fi1"); 
        for(String temp : expected) {
            if(!actual.stream().noneMatch((String s) -> s.equals(temp))) {
                Assert.assertFalse(true);
            }
        }
    }

Upvotes: 0

Tim
Tim

Reputation: 609

I think you want something like this:

    List<String> expected = Arrays.asList("fee", "fi", "foe", "foo");
    List<String> actual = Arrays.asList("feed", "fi");

    assert(actual.size() != expected.size()); // Will fail if same number of elements
    for(String s : actual){
        assert(!expected.contains(s)); // Fails if element in actual is in expected
    }

Upvotes: 0

Niranjan Kumar
Niranjan Kumar

Reputation: 1518

List<String> commonElement = findCommon(actual,expected);    
public List<String> findCommon(List<String> list1, List<String> list2) {
        List<String> list = new ArrayList<String>();

        for (String t : list1) {
            if(list2.contains(t)) {
                list.add(t);
            }
        }

        return list;
    }

Assert.assertTrue(commonElement.size() != 0); //This will fail when actual`

list contains any element in expected list or vice-versa.

Upvotes: 0

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