Merging orphan node is supported.

Add a test for this feature.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 tests/metadata_addon_orphan3.dtb.dts.expect | 22 ++++++++++++++++
 tests/metadata_addon_orphan3.dtb.expect     | 17 +++++++++++++
 tests/metadata_addon_orphan3.dts            | 28 +++++++++++++++++++++
 tests/metadata_addon_orphan3.dts.dts.expect | 22 ++++++++++++++++
 tests/run_tests.sh                          |  3 ++-
 5 files changed, 91 insertions(+), 1 deletion(-)
 create mode 100644 tests/metadata_addon_orphan3.dtb.dts.expect
 create mode 100644 tests/metadata_addon_orphan3.dtb.expect
 create mode 100644 tests/metadata_addon_orphan3.dts
 create mode 100644 tests/metadata_addon_orphan3.dts.dts.expect

diff --git a/tests/metadata_addon_orphan3.dtb.dts.expect b/tests/metadata_addon_orphan3.dtb.dts.expect
new file mode 100644
index 0000000..2605e1b
--- /dev/null
+++ b/tests/metadata_addon_orphan3.dtb.dts.expect
@@ -0,0 +1,22 @@
+/dts-v1/;
+/addon/;
+
+
+&base1 {
+
+	addon-node1 {
+		prop1 = <0x01>;
+		prop2 = <0x02>;
+	};
+
+	addon-node2 {
+		prop3 = <0x03>;
+	};
+};
+
+&base2 {
+
+	addon-node {
+		prop = <0x00>;
+	};
+};
diff --git a/tests/metadata_addon_orphan3.dtb.expect b/tests/metadata_addon_orphan3.dtb.expect
new file mode 100644
index 0000000..5a65483
--- /dev/null
+++ b/tests/metadata_addon_orphan3.dtb.expect
@@ -0,0 +1,17 @@
+/dts-v1/;
+/addon/;
+
+&base1 {
+    addon-node1 {
+        prop1 = <0x00000001>;
+        prop2 = <0x00000002>;
+    };
+    addon-node2 {
+        prop3 = <0x00000003>;
+    };
+};
+&base2 {
+    addon-node {
+        prop = <0x00000000>;
+    };
+};
diff --git a/tests/metadata_addon_orphan3.dts b/tests/metadata_addon_orphan3.dts
new file mode 100644
index 0000000..0fe52ec
--- /dev/null
+++ b/tests/metadata_addon_orphan3.dts
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * Copyright (C) 2026 Bootlin
+ */
+
+/dts-v1/;
+/addon/;
+
+&base1 {
+	addon-node1 {
+		prop1 = <1>;
+	};
+};
+
+&base2 {
+	addon-node {
+		prop = <0>;
+	};
+};
+
+&base1 {
+	addon-node1 {
+		prop2 = <2>;
+	};
+	addon-node2 {
+		prop3 = <3>;
+	};
+};
diff --git a/tests/metadata_addon_orphan3.dts.dts.expect b/tests/metadata_addon_orphan3.dts.dts.expect
new file mode 100644
index 0000000..2605e1b
--- /dev/null
+++ b/tests/metadata_addon_orphan3.dts.dts.expect
@@ -0,0 +1,22 @@
+/dts-v1/;
+/addon/;
+
+
+&base1 {
+
+	addon-node1 {
+		prop1 = <0x01>;
+		prop2 = <0x02>;
+	};
+
+	addon-node2 {
+		prop3 = <0x03>;
+	};
+};
+
+&base2 {
+
+	addon-node {
+		prop = <0x00>;
+	};
+};
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 5edc58b..12418bf 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -1128,7 +1128,8 @@ metadata_tests() {
 	for dt in metadata_reflocal metadata_refphandle \
 		  metadata_addon_base metadata_exportsyms_local \
 		  metadata_exportsyms_ref metadata_importsyms \
-		  metadata_addon_orphan1 metadata_addon_orphan2; do
+		  metadata_addon_orphan1 metadata_addon_orphan2 \
+		  metadata_addon_orphan3; do
 		run_dtc_test -I dts -O dts -o $dt.dts.dts "$SRCDIR/$dt.dts"
 		base_run_test check_diff $dt.dts.dts "$SRCDIR/$dt.dts.dts.expect"
 		run_dtc_test -I dts -O dtb -o $dt.dtb "$SRCDIR/$dt.dts"
-- 
2.52.0