Guava MapMaker

guava-collections-map/src/test/java/com/baeldung/guava/mapmaker/GuavaMapMakerUnitTest.java

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+package com.baeldung.guava.mapmaker;
+
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertEquals;
+
+import com.google.common.collect.MapMaker;
+import org.junit.Test;
+
+import java.util.concurrent.ConcurrentMap;
+
+public class GuavaMapMakerUnitTest {
+        @Test
+        public void whenMakeMap_thenCreated() {
+                ConcurrentMap<String, String> m = new MapMaker()
+                    .makeMap();
+                assertNotNull(m);
+        }
+
+        @Test
+        public void whenMakeMapWithWeakKeys_thenCreated() {
+                ConcurrentMap<String, String> m = new MapMaker()
+                    .weakKeys()
+                    .makeMap();
+                assertNotNull(m);
+        }
+
+        @Test
+        public void whenMakeMapWithWeakValues_thenCreated() {
+                ConcurrentMap<String, String> m = new MapMaker()
+                    .weakValues()
+                    .makeMap();
+                assertNotNull(m);
+        }
+
+        @Test
+        public void whenMakeMapWithInitialCapacity_thenCreated() {
+                ConcurrentMap<String, String> m = new MapMaker()
+                    .initialCapacity(10)
+                    .makeMap();
+                assertNotNull(m);
+        }
+
+        @Test
+        public void whenMakeMapWithConcurrencyLevel_thenCreated() {
+                ConcurrentMap<String, String> m = new MapMaker()
+                    .concurrencyLevel(10)
+                    .makeMap();
+                assertNotNull(m);
+        }
+}