BAEL-1983 Initialize hashmap (#4949)

* BAEL-1983 Initialize hashmap

* BAEL-1983 Initialize hashmap

guava/src/test/java/org/baeldung/guava/GuavaMapInitializeUnitTest.java

@@ -0,0 +1,30 @@
+package org.baeldung.guava;
+
+import static org.hamcrest.core.IsEqual.equalTo;
+import static org.junit.Assert.*;
+
+import java.util.Map;
+import org.junit.Test;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Maps;
+
+public class GuavaMapInitializeUnitTest {
+
+    @Test
+    public void givenKeyValuesShoudInitializeMap() {
+        Map<String, String> articles = ImmutableMap.of("Title", "My New Article", "Title2", "Second Article");
+        
+        assertThat(articles.get("Title"), equalTo("My New Article"));
+        assertThat(articles.get("Title2"), equalTo("Second Article"));
+
+    }
+    
+    
+    @Test
+    public void givenKeyValuesShouldCreateMutableMap() {
+        Map<String, String> articles = Maps.newHashMap(ImmutableMap.of("Title", "My New Article", "Title2", "Second Article"));
+
+        assertThat(articles.get("Title"), equalTo("My New Article"));
+        assertThat(articles.get("Title2"), equalTo("Second Article"));
+    }   
+}