Add failing test for #608 (#816)

Author: cowtowncoder

src/test/java/tools/jackson/dataformat/xml/tofix/XmlTextOnlyDeser608Test.java

@@ -0,0 +1,78 @@
+package tools.jackson.dataformat.xml.tofix;
+
+import org.junit.jupiter.api.Test;
+
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.dataformat.xml.XmlTestUtil;
+import tools.jackson.dataformat.xml.annotation.JacksonXmlProperty;
+import tools.jackson.dataformat.xml.annotation.JacksonXmlText;
+import tools.jackson.dataformat.xml.testutil.failure.JacksonTestFailureExpected;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+// [dataformat-xml#608] Fails to instantiate class when only text node is present
+// and the target type has @JacksonXmlText plus other element properties.
+public class XmlTextOnlyDeser608Test extends XmlTestUtil
+{
+    static class Root608 {
+        public Nested608 nested;
+        public Plain608 plain;
+    }
+
+    // Has @JacksonXmlText AND other element properties
+    static class Nested608 {
+        @JacksonXmlProperty(isAttribute = false)
+        public String other;
+
+        @JacksonXmlProperty(isAttribute = false)
+        public String reallyNotHere;
+
+        @JacksonXmlText
+        public String text;
+    }
+
+    // Has only @JacksonXmlText, no other properties
+    static class Plain608 {
+        @JacksonXmlText
+        public String text;
+    }
+
+    private final ObjectMapper MAPPER = newMapper();
+
+    // Works: nested has both a child element and text content
+    @Test
+    public void testNestedWithChildAndText608() throws Exception {
+        String xml = "<Root608>"
+                + "<nested><other>text</other>The text node.</nested>"
+                + "</Root608>";
+        Root608 result = MAPPER.readValue(xml, Root608.class);
+        assertNotNull(result.nested);
+        assertEquals("text", result.nested.other);
+        assertEquals("The text node.", result.nested.text);
+    }
+
+    // Works: plain type only has @JacksonXmlText
+    @Test
+    public void testPlainTextOnly608() throws Exception {
+        String xml = "<Root608><plain>The text node.</plain></Root608>";
+        Root608 result = MAPPER.readValue(xml, Root608.class);
+        assertNotNull(result.plain);
+        assertEquals("The text node.", result.plain.text);
+    }
+
+    // Fails: nested type has @JacksonXmlText plus other element properties,
+    // but XML only contains text (no child elements). Jackson incorrectly
+    // tries String-argument constructor instead of object deserialization.
+    @JacksonTestFailureExpected
+    @Test
+    public void testNestedWithOnlyText608() throws Exception {
+        String xml = "<Root608><nested>The text node.</nested></Root608>";
+        Root608 result = MAPPER.readValue(xml, Root608.class);
+        assertNotNull(result.nested);
+        assertNull(result.nested.other);
+        assertNull(result.nested.reallyNotHere);
+        assertEquals("The text node.", result.nested.text);
+    }
+}