Wrapped enum with single value throws AssertionError

[DavidLyhedDanielsson]

What steps will reproduce the problem?

Running the given JUnit test

What is the code that triggers this problem?

public class DummyClass {
    enum DummyEnum {
        SINGLE_VALUE
    }

    @Test
    public void verifyHashCodeAndEquals() {
        class DummyInner {
            final DummyEnum value;

            public DummyInner(DummyEnum value) {
                this.value = value;
            }

            @Override
            public boolean equals(Object o) {
                if (this == o) {
                    return true;
                }
                if (o == null || getClass() != o.getClass()) {
                    return false;
                }
                DummyInner that = (DummyInner) o;
                return value == that.value;
            }

            @Override
            public int hashCode() {
                return Objects.hash(value);
            }
        }

        class DummyVersion {
            final String someData;
            final int someMoreData;
            final DummyInner dummyInner;

            public DummyVersion(String someData, int someMoreData, DummyInner dummyInner) {
                this.someData = someData;
                this.someMoreData = someMoreData;
                this.dummyInner = dummyInner;
            }

            @Override
            public boolean equals(Object o) {
                if (this == o) {
                    return true;
                }
                if (o == null || getClass() != o.getClass()) {
                    return false;
                }
                DummyVersion that = (DummyVersion) o;
                return someMoreData == that.someMoreData &&
                        Objects.equals(someData, that.someData) &&
                        Objects.equals(dummyInner, that.dummyInner);
            }

            @Override
            public int hashCode() {
                return Objects.hash(someData, someMoreData, dummyInner);
            }
        }

        EqualsVerifier.forClass(DummyVersion.class).usingGetClass().verify();
    }
}

What error message or stack trace does EqualsVerifier give?

java.lang.AssertionError: Significant fields: equals does not use dummyInner, or it is stateless.
For more information, go to: http://www.jqno.nl/equalsverifier/errormessages

    at nl.jqno.equalsverifier.EqualsVerifier.handleError(EqualsVerifier.java:389)
    at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:375)

What did you expect?

I expect the test to pass

Which version of EqualsVerifier are you using?

2.5

Please provide any additional information below.

The reason why I expect this to work is because even though the enum's value can only be SINGLE_VALUE right now, there will be more enums in the future. In reality, DummyVersion has a bunch of members where I do need to make sure equals and hashcode are correctly implemented, so I can't just skip using EqualsVerifier either.

I figured I would've been able to fix this by ignoring dummyInner:

EqualsVerifier
    .forClass(DummyVersion.class)
    .usingGetClass()
    .withIgnoredFields("dummyInner")
    .verify();

But that gives me

java.lang.AssertionError: Significant fields: equals should not use dummyInner, but it does.
For more information, go to: http://www.jqno.nl/equalsverifier/errormessages

    at nl.jqno.equalsverifier.EqualsVerifier.handleError(EqualsVerifier.java:375)
    at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:361)

[jqno]

Indeed, nice catch. I'll try to find a fix for this, and I'll get back to you.

[jqno]

I just released version 2.5.1, which fixes this.