/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dubbo.rpc.cluster.router.mesh.util;

import org.apache.dubbo.rpc.cluster.router.mesh.rule.VsDestinationGroup;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.mockito.Matchers.anyObject;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.times;
import static org.mockito.Mockito.verify;


class VsDestinationGroupRuleDispatcherTest {

    @Test
    public void post() {
        VsDestinationGroupRuleDispatcher vsDestinationGroupRuleDispatcher = new VsDestinationGroupRuleDispatcher();

        VsDestinationGroupRuleListener vsDestinationGroupRuleListener = mock(VsDestinationGroupRuleListener.class);

        vsDestinationGroupRuleDispatcher.register(vsDestinationGroupRuleListener);

        vsDestinationGroupRuleDispatcher.post(new VsDestinationGroup());
        vsDestinationGroupRuleDispatcher.post(new VsDestinationGroup());

        verify(vsDestinationGroupRuleListener, times(2)).onRuleChange(anyObject());

    }

    @Test
    public void register() {
        VsDestinationGroupRuleDispatcher vsDestinationGroupRuleDispatcher = new VsDestinationGroupRuleDispatcher();

        VsDestinationGroupRuleListener vsDestinationGroupRuleListener = mock(VsDestinationGroupRuleListener.class);

        assertFalse(vsDestinationGroupRuleDispatcher.register(null));
        assertTrue(vsDestinationGroupRuleDispatcher.register(vsDestinationGroupRuleListener));
        assertFalse(vsDestinationGroupRuleDispatcher.register(vsDestinationGroupRuleListener));
    }

    @Test
    public void unregister() {

        VsDestinationGroupRuleDispatcher vsDestinationGroupRuleDispatcher = new VsDestinationGroupRuleDispatcher();

        VsDestinationGroupRuleListener vsDestinationGroupRuleListener = mock(VsDestinationGroupRuleListener.class);
        vsDestinationGroupRuleDispatcher.register(vsDestinationGroupRuleListener);

        vsDestinationGroupRuleDispatcher.post(new VsDestinationGroup());

        vsDestinationGroupRuleDispatcher.unregister(vsDestinationGroupRuleListener);
        vsDestinationGroupRuleDispatcher.post(new VsDestinationGroup());

        verify(vsDestinationGroupRuleListener, times(1)).onRuleChange(anyObject());
    }
}