How to test a generic class?

[Vincent Privat]

Hi,

I'm using EqualsVerifier 2.0.1 for several classes already, but I face an error I don't know how to solve.

I want to test a generic class which looks like that:

public class Storage<T> extends AbstractSet<T>

My equals() method calls super.equals().

When running

        EqualsVerifier.forClass(Storage.class).usingGetClass().verify();

I got this error:

java.lang.AssertionError: Abstract delegation: AbstractSet's equals method delegates to an abstract method:

 null

For more information, go to: http://www.jqno.nl/equalsverifier/errormessages

at nl.jqno.equalsverifier.EqualsVerifier.handleError(EqualsVerifier.java:381)

at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:367)

at org.openstreetmap.josm.data.osm.StorageTest.equalsContract(StorageTest.java:20)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:498)

at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)

at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)

at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)

at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)

at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)

at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)

at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)

at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)

at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)

at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)

at org.junit.runners.ParentRunner.run(ParentRunner.java:363)

at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)

at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)

at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Caused by: java.lang.AbstractMethodError

at java.util.AbstractSet.equals(AbstractSet.java:92)

at nl.jqno.equalsverifier.AbstractDelegationChecker.checkAbstractMethods(AbstractDelegationChecker.java:129)

at nl.jqno.equalsverifier.AbstractDelegationChecker.checkAbstractDelegationInSuper(AbstractDelegationChecker.java:115)

at nl.jqno.equalsverifier.AbstractDelegationChecker.check(AbstractDelegationChecker.java:55)

at nl.jqno.equalsverifier.EqualsVerifier.verifyWithoutExamples(EqualsVerifier.java:405)

at nl.jqno.equalsverifier.EqualsVerifier.performVerification(EqualsVerifier.java:391)

at nl.jqno.equalsverifier.EqualsVerifier.verify(EqualsVerifier.java:364)

... 24 more

Any hint?

[Jan Ouwens]

Hi Vincent,

You’ve found a bug in EqualsVerifier, one which has been present since at least version 1.1.4 (which happens to be the earliest version available on Maven Central). Unfortunately, I can’t give you a workaround for this one, either.

Could you open a ticket on GitHub for this?

Unfortunately, I won’t be able to fix this as quickly as last time, though.

Jan

--
You received this message because you are subscribed to the Google Groups "equalsverifier" group.
To unsubscribe from this group and stop receiving emails from it, send an email to equalsverifie...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[Vincent Privat]

OK thanks! Let's continue to Github then :)