hazelcast-master/hazelcast/src/test/java/com/hazelcast/internal/util/collection/InternalListMultiMapTest.java
/*
 * Copyright (c) 2008-2023, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.internal.util.collection;

import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.annotation.ParallelJVMTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import static org.assertj.core.api.Assertions.assertThat;

@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelJVMTest.class})
public class InternalListMultiMapTest {

    private InternalListMultiMap<Integer, String> multiMap;

    @Before
    public void setUp() {
        this.multiMap = new InternalListMultiMap<>();
    }

    @Test
    public void put_whenEmpty_thenInsertItIntoCollection() {
        multiMap.put(1, "value");
        Collection<String> results = multiMap.get(1);

        assertThat(results).hasSize(1);
        assertThat(results).containsExactlyInAnyOrder("value");
    }

    @Test
    public void put_whenKeyIsAlreadyAssociated_thenAppendItIntoCollection() {
        multiMap.put(1, "value");
        multiMap.put(1, "value");
        Collection<String> results = multiMap.get(1);

        assertThat(results).hasSize(2);
        assertThat(results).containsExactlyInAnyOrder("value", "value");
    }

    @Test
    public void entrySet_whenEmpty_thenReturnEmptySet() {
        Set<Map.Entry<Integer, List<String>>> entries = multiMap.entrySet();
        assertThat(entries).isEmpty();
    }
}
