From 0b2e7e9f7c7089329e783fe3e096fe74cfe4767c Mon Sep 17 00:00:00 2001
From: omerfinger <omerfinger@gmail.com>
Date: Thu, 26 Mar 2020 12:29:05 +0200
Subject: [PATCH] BAEL-3926 - Java Map with case-insensitive keys

---
 .../core-java-collections-maps/pom.xml        |  7 ++++
 .../map/CaseInsensitiveMapUnitTest.java       | 37 +++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 java-collections-maps/src/test/java/com/baeldung/map/CaseInsensitiveMapUnitTest.java

diff --git a/core-java-modules/core-java-collections-maps/pom.xml b/core-java-modules/core-java-collections-maps/pom.xml
index c0dd705c1c..b459213e17 100644
--- a/core-java-modules/core-java-collections-maps/pom.xml
+++ b/core-java-modules/core-java-collections-maps/pom.xml
@@ -26,10 +26,17 @@
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-core</artifactId>
+            <version>${spring.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <properties>
         <commons-collections4.version>4.1</commons-collections4.version>
         <assertj.version>3.6.1</assertj.version>
+        <spring.version>5.2.5.RELEASE</spring.version>
     </properties>
 </project>
diff --git a/java-collections-maps/src/test/java/com/baeldung/map/CaseInsensitiveMapUnitTest.java b/java-collections-maps/src/test/java/com/baeldung/map/CaseInsensitiveMapUnitTest.java
new file mode 100644
index 0000000000..a2171aa326
--- /dev/null
+++ b/java-collections-maps/src/test/java/com/baeldung/map/CaseInsensitiveMapUnitTest.java
@@ -0,0 +1,37 @@
+package com.baeldung.map;
+
+import org.apache.commons.collections4.map.CaseInsensitiveMap;
+import org.junit.Test;
+import org.springframework.util.LinkedCaseInsensitiveMap;
+import static org.junit.Assert.*;
+
+import java.util.TreeMap;
+
+public class CaseInsensitiveMapUnitTest {
+    @Test
+    public void givenCaseInsensitiveTreeMap_whenTwoEntriesAdded_thenSizeIsOne(){
+        TreeMap<String, Integer> treeMap = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
+        treeMap.put("abc", 1);
+        treeMap.put("ABC", 2);
+
+        assertEquals(treeMap.size(), 1);
+    }
+
+    @Test
+    public void givenCommonsCaseInsensitiveMap_whenSameEntryAdded_thenValueUpdated(){
+        CaseInsensitiveMap<String, Integer> commonsHashMap = new CaseInsensitiveMap<>();
+        commonsHashMap.put("abc", 1);
+        commonsHashMap.put("ABC", 2);
+
+        assertEquals(commonsHashMap.get("aBc"), (Integer)2);
+    }
+
+    @Test
+    public void givenLinkedCaseInsensitiveMap_whenEntryRemoved_thenSizeIsZero(){
+        LinkedCaseInsensitiveMap<Integer> linkedHashMap = new LinkedCaseInsensitiveMap<>();
+        linkedHashMap.put("abc", 3);
+        linkedHashMap.remove("aBC");
+
+        assertEquals(linkedHashMap.size(), 0);
+    }
+}