Merge branch '2.x' into 3.0

Author: cowtowncoder

yaml/src/test/java/tools/jackson/dataformat/yaml/tofix/ObjectIdNone296Test.java

@@ -0,0 +1,66 @@
+package tools.jackson.dataformat.yaml.tofix;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIdentityInfo;
+import com.fasterxml.jackson.annotation.ObjectIdGenerators;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.dataformat.yaml.ModuleTestBase;
+import tools.jackson.dataformat.yaml.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.assertSame;
+
+// [dataformats-text#296]: YAML Anchor and alias fails with ObjectIdGenerators.None
+public class ObjectIdNone296Test extends ModuleTestBase
+{
+    private final ObjectMapper MAPPER = newObjectMapper();
+
+    @JacksonTestFailureExpected
+    @Test
+    public void testObjectIdUsingNativeAnchorsWithNoneGenerator() throws Exception
+    {
+        // YAML content with anchor (&foo1) and alias (*foo1)
+        final String YAML_CONTENT =
+                "foo: &foo1\n" +
+                "  value: bar\n" +
+                "boo: *foo1\n";
+
+        // This should work: YAML anchors/aliases should be recognized natively
+        // when using ObjectIdGenerators.None, but currently fails with:
+        // "Cannot construct instance of StringHolder... no String-argument
+        // constructor/factory method to deserialize from String value ('foo1')"
+        ScratchModel result = MAPPER.readValue(YAML_CONTENT, ScratchModel.class);
+
+        assertNotNull(result);
+        assertNotNull(result.foo);
+        assertEquals("bar", result.foo.value);
+        assertNotNull(result.boo);
+        assertEquals("bar", result.boo.value);
+        // The key assertion: both fields should point to the same object instance
+        assertSame(result.foo, result.boo);
+    }
+
+    static class ScratchModel {
+        public StringHolder foo;
+        public StringHolder boo;
+    }
+
+    // Using ObjectIdGenerators.None should allow YAML's native anchor/alias to work
+    @JsonIdentityInfo(generator = ObjectIdGenerators.None.class)
+    static class StringHolder {
+        public String value;
+
+        protected StringHolder() { }
+        
+        @JsonCreator(mode = JsonCreator.Mode.DELEGATING)
+        public StringHolder(String v) { value = v; }
+
+        @Override
+        public String toString() {
+            return "StringHolder{" + value +" }";
+        }
+    }
+}