Add a test to show #508 fixed (#751)

Author: cowtowncoder

release-notes/VERSION-2.x

@@ -4,6 +4,8 @@ Project: jackson-dataformat-xml
 === Releases ===
 ------------------------------------------------------------------------
 
+#508: `XmlMapper` is unable to deserialise into an empty record
+ (reported by @protazy)
 #745: Add feature to include `standalone='yes'` in xml declaration
  (contributed by @duoduobingbing)
 

src/test-jdk17/java/com/fasterxml/jackson/dataformat/xml/records/XmlEmptyRecordDeser508Test.java

@@ -0,0 +1,29 @@
+package com.fasterxml.jackson.dataformat.xml.records;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.dataformat.xml.*;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+// [dataformat-xml#508]
+public class XmlEmptyRecordDeser508Test extends XmlTestUtil
+{
+    static class EmptyClass508 {
+    }
+
+    public record EmptyRecord508() {
+    }
+
+    private final XmlMapper MAPPER = new XmlMapper();
+
+    @Test
+    public void testEmptyPOJO() throws Exception {
+        assertNotNull(MAPPER.readValue("<EmptyClass508/>", EmptyClass508.class));
+    }
+
+    @Test
+    public void testEmptyRecord() throws Exception {
+        assertNotNull(MAPPER.readValue("<EmptyRecord508/>", EmptyRecord508.class));
+    }
+}