Add tests related to addon orphan nodes (FDT_BEGIN_NODE_REF dtb tag).

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 tests/metadata_addon_orphan1.dtb.dts.expect | 16 ++++++++++++++++
 tests/metadata_addon_orphan1.dtb.expect     | 13 +++++++++++++
 tests/metadata_addon_orphan1.dts            | 19 +++++++++++++++++++
 tests/metadata_addon_orphan1.dts.dts.expect | 16 ++++++++++++++++
 tests/run_tests.sh                          |  3 ++-
 5 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 tests/metadata_addon_orphan1.dtb.dts.expect
 create mode 100644 tests/metadata_addon_orphan1.dtb.expect
 create mode 100644 tests/metadata_addon_orphan1.dts
 create mode 100644 tests/metadata_addon_orphan1.dts.dts.expect

diff --git a/tests/metadata_addon_orphan1.dtb.dts.expect b/tests/metadata_addon_orphan1.dtb.dts.expect
new file mode 100644
index 0000000..c24a00f
--- /dev/null
+++ b/tests/metadata_addon_orphan1.dtb.dts.expect
@@ -0,0 +1,16 @@
+/dts-v1/;
+/addon/;
+
+/ {
+
+	node-a {
+		prop = <0x01>;
+	};
+};
+
+&base {
+
+	addon-node {
+		prop = <0x02>;
+	};
+};
diff --git a/tests/metadata_addon_orphan1.dtb.expect b/tests/metadata_addon_orphan1.dtb.expect
new file mode 100644
index 0000000..7058a2e
--- /dev/null
+++ b/tests/metadata_addon_orphan1.dtb.expect
@@ -0,0 +1,13 @@
+/dts-v1/;
+/addon/;
+
+/ {
+    node-a {
+        prop = <0x00000001>;
+    };
+};
+&base {
+    addon-node {
+        prop = <0x00000002>;
+    };
+};
diff --git a/tests/metadata_addon_orphan1.dts b/tests/metadata_addon_orphan1.dts
new file mode 100644
index 0000000..f20d179
--- /dev/null
+++ b/tests/metadata_addon_orphan1.dts
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * Copyright (C) 2026 Bootlin
+ */
+
+/dts-v1/;
+/addon/;
+
+/ {
+	node-a {
+		prop = <1>;
+	};
+};
+
+&base {
+	addon-node {
+		prop = <2>;
+	};
+};
diff --git a/tests/metadata_addon_orphan1.dts.dts.expect b/tests/metadata_addon_orphan1.dts.dts.expect
new file mode 100644
index 0000000..c24a00f
--- /dev/null
+++ b/tests/metadata_addon_orphan1.dts.dts.expect
@@ -0,0 +1,16 @@
+/dts-v1/;
+/addon/;
+
+/ {
+
+	node-a {
+		prop = <0x01>;
+	};
+};
+
+&base {
+
+	addon-node {
+		prop = <0x02>;
+	};
+};
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index a5e31df..659b42b 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -1127,7 +1127,8 @@ wrap_fdtdump () {
 metadata_tests() {
 	for dt in metadata_reflocal metadata_refphandle \
 		  metadata_addon_base metadata_exportsyms_local \
-		  metadata_exportsyms_ref metadata_importsyms; do
+		  metadata_exportsyms_ref metadata_importsyms \
+		  metadata_addon_orphan1; 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