From a7a97689ba5d4e530c0f7ec3c1602a5d94dbc329 Mon Sep 17 00:00:00 2001
From: "Kai.Yuan" <kent.yuan@Gmail.com>
Date: Sat, 3 Feb 2024 00:28:22 +0100
Subject: [PATCH] [count-upper-lower] add unicode char tests

---
 .../CountUpperAndLowercaseCharsUnitTest.java              | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java
index b1ed82ea34..9137906a5a 100644
--- a/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java
+++ b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java
@@ -3,6 +3,7 @@ package com.baeldung.countupperandlowercasechars;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class CountUpperAndLowercaseCharsUnitTest {
     private static final String MY_STRING = "Hi, Welcome to Baeldung! Let's count letters!";
@@ -50,6 +51,13 @@ public class CountUpperAndLowercaseCharsUnitTest {
         assertEquals(4, result.getUppercaseCount());
         assertEquals(31, result.getLowercaseCount());
     }
+
+
+    @Test
+    void whenUsingIsUpperCaseAndIsLowerCase_thenUnicodeCharactersCanBeChecked() {
+        assertTrue(Character.isLowerCase('ä'));
+        assertTrue(Character.isUpperCase('Ä'));
+    }
 }
 
 class LetterCount {