Add test case for issue 3342 (using JsonTypeInfo.As.EXTERNAL_PROPERTY…

… with Records).

src/test-jdk14/java/com/fasterxml/jackson/databind/records/RecordTypeInfo3342Test.java

@@ -0,0 +1,58 @@
+package com.fasterxml.jackson.databind.records;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+// [databind#3102]
+public class RecordTypeInfo3342Test extends BaseMapTest
+{
+    public enum SpiceLevel {
+        LOW,
+        HIGH
+    }
+
+    public interface SpiceTolerance {
+    }
+
+    public record LowSpiceTolerance(String food) implements SpiceTolerance {
+    }
+
+    public record HighSpiceTolerance(String food) implements SpiceTolerance {
+    }
+
+    public record Example(
+            SpiceLevel level,
+            @JsonTypeInfo(
+                    use = JsonTypeInfo.Id.NAME,
+                    include = JsonTypeInfo.As.EXTERNAL_PROPERTY,
+                    property = "level")
+            @JsonSubTypes({
+                    @JsonSubTypes.Type(value = LowSpiceTolerance.class, name = "LOW"),
+                    @JsonSubTypes.Type(value = HighSpiceTolerance.class, name = "HIGH")
+            })
+            SpiceTolerance tolerance) { }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    public void testSerializeDeserializeJsonSubType_LOW() throws Exception {
+        Example record = new Example(SpiceLevel.LOW, new LowSpiceTolerance("Tomato"));
+
+        String json = MAPPER.writeValueAsString(record);
+        assertEquals("{\"level\":\"LOW\",\"tolerance\":{\"food\":\"Tomato\"}}", json);
+
+        Example value = MAPPER.readValue(json, Example.class);
+        assertEquals(record, value);
+    }
+
+    public void testSerializeDeserializeJsonSubType_HIGH() throws Exception {
+        Example record = new Example(SpiceLevel.HIGH, new HighSpiceTolerance("Chilli"));
+
+        String json = MAPPER.writeValueAsString(record);
+        assertEquals("{\"level\":\"HIGH\",\"tolerance\":{\"food\":\"Chilli\"}}", json);
+
+        Example value = MAPPER.readValue(json, Example.class);
+        assertEquals(record, value);
+    }
+}