fix code

hutool-json/src/test/java/org/dromara/hutool/json/IssueI9DX5HTest.java

@@ -0,0 +1,20 @@
+package org.dromara.hutool.json;
+
+import org.dromara.hutool.core.text.StrUtil;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class IssueI9DX5HTest {
+
+	@SuppressWarnings("MismatchedQueryAndUpdateOfCollection")
+	@Test
+	void xmlToJSONTest() {
+		final String xml = "<GoodMsg>你好</GoodMsg>";
+		final JSONObject jsonObject = new JSONObject(xml, JSONConfig.of(), entry -> {
+			entry.setKey(StrUtil.toUnderlineCase(entry.getKey()));
+			return true;
+		});
+
+		Assertions.assertEquals("{\"good_msg\":\"你好\"}", jsonObject.toString());
+	}
+}