tests has been added and split

java-collections-maps-3/src/test/java/com/baeldung/map/caseinsensitivekeys/CaseInsensitiveMapUnitTest.java

@@ -15,7 +15,37 @@ public class CaseInsensitiveMapUnitTest {
         treeMap.put("abc", 1);
         treeMap.put("ABC", 2);
 
-        assertEquals(treeMap.size(), 1);
+        assertEquals(1, treeMap.size());
+
+    }
+
+    @Test
+    public void givenCommonsCaseInsensitiveMap_whenTwoEntriesAdded_thenSizeIsOne(){
+        CaseInsensitiveMap<String, Integer> commonsHashMap = new CaseInsensitiveMap<>();
+        commonsHashMap.put("abc", 1);
+        commonsHashMap.put("ABC", 2);
+
+        assertEquals(1, commonsHashMap.size());
+
+    }
+
+    @Test
+    public void givenLinkedCaseInsensitiveMap_whenTwoEntriesAdded_thenSizeIsOne(){
+        LinkedCaseInsensitiveMap<Integer> linkedHashMap = new LinkedCaseInsensitiveMap<>();
+        linkedHashMap.put("abc", 1);
+        linkedHashMap.put("ABC", 2);
+
+        assertEquals(1, linkedHashMap.size());
+
+    }
+
+    @Test
+    public void givenCaseInsensitiveTreeMap_whenSameEntryAdded_thenValueUpdated(){
+        TreeMap<String, Integer> treeMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
+        treeMap.put("abc", 1);
+        treeMap.put("ABC", 2);
+
+        Assert.assertEquals((Integer)2, treeMap.get("aBc"));
     }
 
     @Test
@@ -24,7 +54,34 @@ public class CaseInsensitiveMapUnitTest {
         commonsHashMap.put("abc", 1);
         commonsHashMap.put("ABC", 2);
 
-        Assert.assertEquals(commonsHashMap.get("aBc"), (Integer)2);
+        Assert.assertEquals((Integer)2, commonsHashMap.get("aBc"));
+    }
+
+    @Test
+    public void givenLinkedCaseInsensitiveMap_whenSameEntryAdded_thenValueUpdated(){
+        LinkedCaseInsensitiveMap<Integer> linkedHashMap = new LinkedCaseInsensitiveMap<>();
+        linkedHashMap.put("abc", 1);
+        linkedHashMap.put("ABC", 2);
+
+        Assert.assertEquals((Integer)2, linkedHashMap.get("aBc"));
+    }
+
+    @Test
+    public void givenCaseInsensitiveTreeMap_whenEntryRemoved_thenSizeIsZero(){
+        TreeMap<String, Integer> treeMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
+        treeMap.put("abc", 3);
+        treeMap.remove("aBC");
+
+        Assert.assertEquals(0, treeMap.size());
+    }
+
+    @Test
+    public void givenCommonsCaseInsensitiveMap_whenEntryRemoved_thenSizeIsZero(){
+        CaseInsensitiveMap<String, Integer> commonsHashMap = new CaseInsensitiveMap<>();
+        commonsHashMap.put("abc", 3);
+        commonsHashMap.remove("aBC");
+
+        Assert.assertEquals(0, commonsHashMap.size());
     }
 
     @Test
@@ -33,6 +90,6 @@ public class CaseInsensitiveMapUnitTest {
         linkedHashMap.put("abc", 3);
         linkedHashMap.remove("aBC");
 
-        Assert.assertEquals(linkedHashMap.size(), 0);
+        Assert.assertEquals(0, linkedHashMap.size());
     }
 }