}

        return !(testPattern != null ? !testPattern.equals(that.testPattern) : that.testPattern != null);
    }

    @Override
    public int hashCode() {
        int result = className != null ? className.hashCode() : 0;
        result = 31 * result + (methodName != null ? methodName.hashCode() : 0);
        result = 31 * result + (testPattern != null ? testPattern.hashCode() : 0);
        return result;
    }

        def failure = new RuntimeException("Test IO Exception")
        def resource = Stub(ExternalResource)
        def testPattern = pattern("/a/pattern/with/[revision]/")
        _ * repo.resource(_) >> resource
        _ * resource.list() >> { throw failure }

        when:
        lister.listVersions(module, artifact, [testPattern], result)

        then:
        ResourceException e = thrown()