/*
* Copyright 2012-present Facebook, Inc.
*
* 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.facebook.buck.graph;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import com.google.common.collect.HashMultimap;
import org.junit.Test;
public class HashMultimapTest {
/**
* The specification on {@link HashMultimap} is silent on whether {@link
* HashMultimap#remove(Object, Object)} removes the key from the Multimap if the key/value pair is
* the last entry for the key in the map. This test verifies this behavior as {@link
* MutableDirectedGraph} depends on it.
*/
@Test
public void testRemoveLastEntryRemovesKey() {
HashMultimap<String, String> edges = HashMultimap.create();
edges.put("A", "B");
edges.put("A", "C");
edges.put("A", "D");
assertEquals(3, edges.size());
assertTrue(edges.containsKey("A"));
edges.remove("A", "B");
edges.remove("A", "C");
edges.remove("A", "D");
assertEquals(0, edges.size());
assertFalse(edges.containsKey("A"));
}
}