diff --git a/hutool-core/src/test/java/cn/hutool/core/codec/PunyCodeTest.java b/hutool-core/src/test/java/cn/hutool/core/codec/PunyCodeTest.java
index 4e575154c..04bcbf435 100644
--- a/hutool-core/src/test/java/cn/hutool/core/codec/PunyCodeTest.java
+++ b/hutool-core/src/test/java/cn/hutool/core/codec/PunyCodeTest.java
@@ -7,8 +7,8 @@ public class PunyCodeTest {
 
 	@Test
 	public void encodeDecodeTest(){
-		String text = "Hutool编码器";
-		String strPunyCode = PunyCode.encode(text);
+		final String text = "Hutool编码器";
+		final String strPunyCode = PunyCode.encode(text);
 		Assert.assertEquals("Hutool-ux9js33tgln", strPunyCode);
 		String decode = PunyCode.decode("Hutool-ux9js33tgln");
 		Assert.assertEquals(text, decode);
@@ -19,25 +19,34 @@ public class PunyCodeTest {
 	@Test
 	public void encodeDecodeTest2(){
 		// 无需编码和解码
-		String text = "Hutool";
-		String strPunyCode = PunyCode.encode(text);
+		final String text = "Hutool";
+		final String strPunyCode = PunyCode.encode(text);
 		Assert.assertEquals("Hutool", strPunyCode);
 	}
 
 	@Test
 	public void encodeEncodeDomainTest(){
-		String domain = "赵新虎.中国";
-		String strPunyCode = PunyCode.encodeDomain(domain);
-		String decode = PunyCode.decodeDomain(strPunyCode);
+		final String domain = "赵新虎.中国";
+		final String strPunyCode = PunyCode.encodeDomain(domain);
+		final String decode = PunyCode.decodeDomain(strPunyCode);
 		Assert.assertEquals(decode, domain);
 	}
 
 	@Test
 	public void encodeEncodeDomainTest2(){
-		String domain = "赵新虎.com";
-		String strPunyCode = PunyCode.encodeDomain(domain);
+		final String domain = "赵新虎.com";
+		final String strPunyCode = PunyCode.encodeDomain(domain);
 		Assert.assertEquals("xn--efvz93e52e.com", strPunyCode);
-		String decode = PunyCode.decodeDomain(strPunyCode);
+		final String decode = PunyCode.decodeDomain(strPunyCode);
+		Assert.assertEquals(domain, decode);
+	}
+
+	@Test
+	public void encodeEncodeDomainTest3(){
+		final String domain = "赵新虎.COM";
+		final String strPunyCode = PunyCode.encodeDomain(domain);
+		Assert.assertEquals("xn--efvz93e52e.COM", strPunyCode);
+		final String decode = PunyCode.decodeDomain(strPunyCode);
 		Assert.assertEquals(domain, decode);
 	}
 }