diff --git a/hutool-core/src/test/java/cn/hutool/core/util/IssueICOJVZTest.java b/hutool-core/src/test/java/cn/hutool/core/util/IssueICOJVZTest.java
new file mode 100644
index 000000000..1e3e5997d
--- /dev/null
+++ b/hutool-core/src/test/java/cn/hutool/core/util/IssueICOJVZTest.java
@@ -0,0 +1,13 @@
+package cn.hutool.core.util;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class IssueICOJVZTest {
+	@Test
+	void toUnderlineTest(){
+		String field = "PAGE_NAME";
+		field = StrUtil.toUnderlineCase(field).toUpperCase();
+		Assertions.assertEquals("PAGE_NAME", field);
+	}
+}