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Merge pull request eugenp#6629 from sushant57/master
Guide to Guava Multiset
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‎guava-collections-set/.gitignore‎

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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear

‎guava-collections-set/pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>guava-collections-set</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>guava-collections-set</name>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<!-- test scoped -->
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>guava-collections-set</finalName>
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</build>
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<properties>
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<!-- util -->
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<guava.version>27.1-jre</guava.version>
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<!-- testing -->
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<assertj.version>3.6.1</assertj.version>
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</properties>
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</project>

‎guava-collections-set/src/test/java/org/baeldung/guava/GuavaMultiSetUnitTest.java‎

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package org.baeldung.guava;
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import com.google.common.collect.HashMultiset;
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import com.google.common.collect.Multiset;
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import org.junit.Test;
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import java.util.HashMap;
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import java.util.Map;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatThrownBy;
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public class GuavaMultiSetUnitTest {
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@Test
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public void givenMultiSet_whenAddingValues_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.contains("Potter")).isTrue();
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assertThat(bookStore.count("Potter")).isEqualTo(3);
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}
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@Test
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public void givenMultiSet_whenRemovingValues_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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bookStore.remove("Potter");
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assertThat(bookStore.contains("Potter")).isTrue();
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assertThat(bookStore.count("Potter")).isEqualTo(1);
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}
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@Test
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public void givenMultiSet_whenSetCount_shouldReturnCorrectCount() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.setCount("Potter", 50);
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assertThat(bookStore.count("Potter")).isEqualTo(50);
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}
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@Test
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public void givenMultiSet_whenSettingNegativeCount_shouldThrowException() {
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Multiset<String> bookStore = HashMultiset.create();
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assertThatThrownBy(() -> bookStore.setCount("Potter", -1))
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.isInstanceOf(IllegalArgumentException.class);
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}
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@Test
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public void givenMultiSet_whenSettingCountWithEmptySet_shouldBeSuccessful() {
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Multiset<String> bookStore = HashMultiset.create();
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assertThat(bookStore.setCount("Potter", 0, 2)).isTrue();
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}
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@Test
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public void givenMultiSet_whenSettingCountWithCorrectValue_shouldBeSuccessful() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.setCount("Potter", 2, 52)).isTrue();
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}
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@Test
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public void givenMultiSet_whenSettingCountWithIncorrectValue_shouldFail() {
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Multiset<String> bookStore = HashMultiset.create();
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bookStore.add("Potter");
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bookStore.add("Potter");
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assertThat(bookStore.setCount("Potter", 5, 52)).isFalse();
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}
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@Test
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public void givenMap_compareMultiSetOperations() {
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Map<String, Integer> bookStore = new HashMap<>();
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bookStore.put("Potter", 3);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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assertThat(bookStore.get("Potter")).isEqualTo(3);
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bookStore.put("Potter", 2);
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assertThat(bookStore.get("Potter")).isEqualTo(2);
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bookStore.put("Potter", null);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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bookStore.put("Potter", -1);
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assertThat(bookStore.containsKey("Potter")).isTrue();
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}
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}

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