hasNoNullFields does not detect null collections

[eijckron]

Describe the bug The hasNoNullFields assertion does not detect null values for collections while it works fine for other types

• assertj core version: 3.27.3
• java version: 21
• test framework version: junit-jupiter 5.10.3

Test case reproducing the bug The following test should fail for both assertions however the first passes while the second one correctly fails

class NullCheckTest {

    public record Data(List<String> l, String s){};

    @Test
    void testNullString() {
        Data data1 = new Data(null, "");
        Data data2 = new Data(List.of(), null);

        assertThat(data1).usingRecursiveAssertion().hasNoNullFields();
        assertThat(data2).usingRecursiveAssertion().hasNoNullFields();
    }
}

[reduan96]

I'd like to take this if it's possible, thanks !

[joel-costigliola]

That's a bug Sorry for the late answer, this is actually supported if you select the CollectionAssertionPolicy.COLLECTION_OBJECT_AND_ELEMENTS which should have been the default but was not.