From 663d1831daa310ddb355cd2aec41c7e56e70cfda Mon Sep 17 00:00:00 2001
From: MohamedHelmyKassab
 <137485958+MohamedHelmyKassab@users.noreply.github.com>
Date: Fri, 22 Mar 2024 20:15:31 +0200
Subject: [PATCH] This commit is related to BAEL-6404 (#16201)

This commit aims to add a test class "UTF8ToISOUnitTest.java" To convert UTF-8 to ISO-8859-1 in Java.
---
 .../baeldung/UTF8ToISO/UTF8ToISOUnitTest.java | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/UTF8ToISO/UTF8ToISOUnitTest.java

diff --git a/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/UTF8ToISO/UTF8ToISOUnitTest.java b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/UTF8ToISO/UTF8ToISOUnitTest.java
new file mode 100644
index 0000000000..f47ea5fdaf
--- /dev/null
+++ b/core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/UTF8ToISO/UTF8ToISOUnitTest.java
@@ -0,0 +1,30 @@
+package com.baeldung.UTF8ToISO;
+
+import org.junit.jupiter.api.Test;
+
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.StandardCharsets;
+
+import static org.junit.Assert.assertArrayEquals;
+
+public class UTF8ToISOUnitTest {
+    String string = "âabcd";
+    byte[] expectedBytes = new byte[]{(byte) 0xE2, 0x61, 0x62, 0x63, 0x64};
+
+    @Test
+    public void givenUtf8String_whenUsingGetByte_thenIsoBytesShouldBeEqual() {
+        byte[] iso88591bytes = string.getBytes(StandardCharsets.ISO_8859_1);
+        assertArrayEquals(expectedBytes, iso88591bytes);
+    }
+
+    @Test
+    public void givenString_whenUsingByteBufferCharBufferConvertToIso_thenBytesShouldBeEqual() {
+        ByteBuffer inputBuffer = ByteBuffer.wrap(string.getBytes(StandardCharsets.UTF_8));
+        CharBuffer data = StandardCharsets.UTF_8.decode(inputBuffer);
+        ByteBuffer outputBuffer = StandardCharsets.ISO_8859_1.encode(data);
+        byte[] outputData = new byte[outputBuffer.remaining()];
+        outputBuffer.get(outputData);
+        assertArrayEquals(expectedBytes, outputData);
+    }
+}