add testcase for issue #3687

core/src/test/java/com/alibaba/fastjson2/JSONWriterWriteNameRawTest.java

@@ -0,0 +1,34 @@
+package com.alibaba.fastjson2;
+
+import org.junit.jupiter.api.Test;
+
+import static com.alibaba.fastjson2.JSONWriter.PRETTY_2_SPACE;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class JSONWriterWriteNameRawTest {
+    @Test
+    public void test() {
+        long v = 3978425819141910881L;
+
+        String expected = ",\n" +
+                "\"a1234567\":";
+        {
+            JSONWriterUTF16 jsonWriter = (JSONWriterUTF16) JSONWriter.ofUTF16();
+            jsonWriter.chars = new char[0];
+            jsonWriter.pretty = PRETTY_2_SPACE;
+            jsonWriter.startObject = false;
+
+            jsonWriter.writeName8Raw(v);
+            assertEquals(expected, jsonWriter.toString());
+        }
+        {
+            JSONWriterUTF8 jsonWriter = (JSONWriterUTF8) JSONWriter.ofUTF8();
+            jsonWriter.bytes = new byte[0];
+            jsonWriter.pretty = PRETTY_2_SPACE;
+            jsonWriter.startObject = false;
+
+            jsonWriter.writeName8Raw(v);
+            assertEquals(expected, jsonWriter.toString());
+        }
+    }
+}