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 * Copyright 2017, TeamDev Ltd. All rights reserved.
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 * modification, must retain the above copyright notice and the following
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package io.spine.server.commandbus;

import com.google.common.collect.ImmutableSet;
import io.spine.client.TestActorRequestFactory;
import io.spine.core.CommandClass;
import io.spine.core.CommandEnvelope;
import org.junit.Test;

import java.util.Set;

import static io.spine.test.TestValues.newUuidValue;
import static org.junit.Assert.assertTrue;

public class DelegatingCommandDispatcherShould {

    @Test
    public void delegate_onError() throws Exception {
        final EmptyCommandDispatcherDelegate delegate = new EmptyCommandDispatcherDelegate();

        final DelegatingCommandDispatcher<String> delegatingDispatcher =
                DelegatingCommandDispatcher.of(delegate);

        final CommandEnvelope commandEnvelope = CommandEnvelope.of(
                TestActorRequestFactory.newInstance(getClass()).createCommand(newUuidValue())
        );

        delegatingDispatcher.onError(commandEnvelope, new RuntimeException(getClass().getName()));

        assertTrue(delegate.onErrorCalled());
    }

    private static final class EmptyCommandDispatcherDelegate
            implements CommandDispatcherDelegate<String> {

        private boolean onErrorCalled;

        @Override
        public Set<CommandClass> getCommandClasses() {
            return ImmutableSet.of();
        }

        @Override
        public String dispatchCommand(CommandEnvelope envelope) {
            return getClass().getName();
        }

        @Override
        public void onError(CommandEnvelope envelope, RuntimeException exception) {
            onErrorCalled = true;
        }

        boolean onErrorCalled() {
            return onErrorCalled;
        }
    }
}

Test `onError()` delegation