Add test for #4715 in 2.15 (passing)

Author: cowtowncoder

src/test-jdk17/java/com/fasterxml/jackson/databind/jdk17/RecordPrivate4175Test.java

@@ -0,0 +1,27 @@
+package com.fasterxml.jackson.databind.jdk17;
+
+import java.util.Collections;
+
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+// for [databind#4175]
+public class RecordPrivate4175Test extends BaseMapTest
+{
+    private static record PrivateTextRecord4175(String text) { }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    // for [databind#4175]
+    public void testSerializePrivateTextRecord() throws Exception {
+        PrivateTextRecord4175 textRecord = new PrivateTextRecord4175("anything");
+        String json = MAPPER.writeValueAsString(textRecord);
+        final Object EXP = Collections.singletonMap("text", "anything");
+        assertEquals(EXP, MAPPER.readValue(json, Object.class));
+    }
+
+    public void testDeserializePrivateTextRecord() throws Exception {
+        assertEquals(new PrivateTextRecord4175("anything"),
+                MAPPER.readValue("{\"text\":\"anything\"}", PrivateTextRecord4175.class));
+    }
+}