From 7a5cbf397125651c2aab6c70269808d6e7483ca9 Mon Sep 17 00:00:00 2001
From: Mo Helmy <135069400+BenHelmyBen@users.noreply.github.com>
Date: Thu, 25 Apr 2024 18:20:58 +0200
Subject: [PATCH] This commit is related to BAEL-7854 (#16489)

This commit aims to add a test class named "HashMapCharacterCountUnitTest".
---
 .../HashMapCharacterCountUnitTest.java        | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 core-java-modules/core-java-string-operations-9/src/test/java/com/baeldung/hashmapcharactercount/HashMapCharacterCountUnitTest.java

diff --git a/core-java-modules/core-java-string-operations-9/src/test/java/com/baeldung/hashmapcharactercount/HashMapCharacterCountUnitTest.java b/core-java-modules/core-java-string-operations-9/src/test/java/com/baeldung/hashmapcharactercount/HashMapCharacterCountUnitTest.java
new file mode 100644
index 0000000000..7f3e390c80
--- /dev/null
+++ b/core-java-modules/core-java-string-operations-9/src/test/java/com/baeldung/hashmapcharactercount/HashMapCharacterCountUnitTest.java
@@ -0,0 +1,38 @@
+package com.baeldung.hashmapcharactercount;
+
+import org.junit.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static java.util.stream.Collectors.toMap;
+import static org.junit.Assert.assertEquals;
+
+public class HashMapCharacterCountUnitTest {
+    String str = "abcaadcbcb";
+
+    @Test
+    public void givenString_whenUsingStreams_thenVerifyCounts() {
+        Map<Character, Integer> charCount = str.chars()
+                .boxed()
+                .collect(toMap(
+                        k -> (char) k.intValue(),
+                        v -> 1,
+                        Integer::sum));
+
+        assertEquals(3, charCount.get('a').intValue());
+    }
+
+    @Test
+    public void givenString_whenUsingLooping_thenVerifyCounts() {
+        Map<Character, Integer> charCount = new HashMap<>();
+        for (char c : str.toCharArray()) {
+            charCount.merge(c,
+                    1,
+                    Integer::sum);
+        }
+        assertEquals(3, charCount.get('a').intValue());
+    }
+
+
+}