return null;
        }

        @Override
        public List<Throwable> getFailures() {
            return failures;
        }

        @Override
        public RuntimeException getFailureOrNull() {
            return getFailure();
        }

        @Override
        public RuntimeException getFailure() {
            if (failures.size() == 1 && failures.get(0) instanceof RuntimeException) {

        if (existing.getFailure() == null) {
            return existing.getModuleVersionId().getVersion().isEmpty();
        }
        return false;
    }

    private static boolean sameVersion(ComponentIdResolveResult existing, ComponentIdResolveResult resolveResult) {
        if (existing.getFailure() == null && resolveResult.getFailure() == null) {

    private static final Comparator<Map.Entry<ModuleComponentArtifactIdentifier, Collection<RepositoryAwareVerificationFailure>>> MISSING_LAST = Comparator.comparing(e -> e.getValue().stream().anyMatch(f -> f.getFailure() instanceof MissingChecksums) ? 1 : 0);

        } else {
            actual = () -> dependency.getAttempted().getDisplayName();
        }
    }

    public Throwable getFailure() {
        return dependency.getFailure();
    }

    @Override
    public boolean isResolvable() {
        return false;
    }

    @Override
    public ComponentSelector getRequested() {

        this.result = toSerializableModel(finishEvent.getResult());
        this.resultClassName = result == null ? null : finishEvent.getResult().getClass().getName();
        this.failureMsg = finishEvent.getFailure() == null ? null : finishEvent.getFailure().toString();
    }

    SerializedOperationFinish(Map<String, ?> map) {
        this.id = ((Integer) map.get("id")).longValue();
        this.endTime = (Long) map.get("endTime");

            statusProgressLogger.completed();
        }
        progressLogger.completed(context.getStatus(), context.getFailure() != null);
        buildOperationListener.finished(descriptor, new OperationFinishEvent(operationState.getStartTime(), clock.getCurrentTime(), context.getFailure(), context.getResult()));
    }

    @Override
    public void close(BuildOperationDescriptor descriptor, BuildOperationState operationState) {

    @Test
    public void defaultValues() {
        assertFalse(state.getExecuted())
        assertFalse(state.getExecuting())
        assertTrue(state.configurable)
        assertThat(state.getFailure(), nullValue())
        assertFalse(state.getDidWork())
        assertFalse(state.getSkipped())
        assertThat(state.getSkipMessage(), nullValue())
        assertFalse(state.upToDate)

            getSelector() >> Stub(DependencyGraphSelector) {
                getResultId() >> 4L
                getRequested() >> requested
            }
            getFromVariant() >> 55L
            getFailure() >> null
            getSelected() >> 12L
            getSelectedVariant() >> 123L
            getReason() >> ComponentSelectionReasons.requested()
        }

        when:

        try {
            doAction(args, listener);
        } catch (Throwable e) {
            createErrorHandler().execute(e);
            listener.onFailure(e);
        }

        Throwable failure = listener.getFailure();
        ExecutionCompleter completer = createCompleter();
        if (failure == null) {
            completer.complete();
        } else {
            completer.completeWithFailure(failure);
        }
    }

                TaskExecuterResult result = executeTask(operationContext);
                operationContext.setStatus(state.getFailure() != null ? "FAILED" : state.getSkipMessage());
                operationContext.failed(state.getFailure());
                return result;
            }

            private TaskExecuterResult executeTask(BuildOperationContext operationContext) {