[PATCH] tests: Add stacked overlay tests on fdtoverlay

[Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>]

Add a stacked overlay unit test, piggybacking on fdtoverlay.

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
---
 tests/run_tests.sh             | 15 +++++++++++++++
 tests/stacked_overlay_bar.dts  | 13 +++++++++++++
 tests/stacked_overlay_base.dts |  6 ++++++
 tests/stacked_overlay_baz.dts  | 13 +++++++++++++
 4 files changed, 47 insertions(+)
 create mode 100644 tests/stacked_overlay_bar.dts
 create mode 100644 tests/stacked_overlay_base.dts
 create mode 100644 tests/stacked_overlay_baz.dts

diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index b8a2825..3bc5b41 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -791,6 +791,21 @@ fdtoverlay_tests() {
 
     # test that the new property is installed
     run_fdtoverlay_test foobar "/test-node" "test-str-property" "-ts" ${basedtb} ${targetdtb} ${overlaydtb}
+
+    stacked_base=stacked_overlay_base.dts
+    stacked_basedtb=stacked_overlay_base.fdtoverlay.test.dtb
+    stacked_bar=stacked_overlay_bar.dts
+    stacked_bardtb=stacked_overlay_bar.fdtoverlay.test.dtb
+    stacked_baz=stacked_overlay_baz.dts
+    stacked_bazdtb=stacked_overlay_baz.fdtoverlay.test.dtb
+    stacked_targetdtb=stacked_overlay_target.fdtoverlay.test.dtb
+
+    run_dtc_test -@ -I dts -O dtb -o $stacked_basedtb $stacked_base
+    run_dtc_test -@ -I dts -O dtb -o $stacked_bardtb $stacked_bar
+    run_dtc_test -@ -I dts -O dtb -o $stacked_bazdtb $stacked_baz
+
+    # test that baz correctly inserted the property
+    run_fdtoverlay_test baz "/foonode/barnode/baznode" "baz-property" "-ts" ${stacked_basedtb} ${stacked_targetdtb} ${stacked_bardtb} ${stacked_bazdtb}
 }
 
 pylibfdt_tests () {
diff --git a/tests/stacked_overlay_bar.dts b/tests/stacked_overlay_bar.dts
new file mode 100644
index 0000000..c646399
--- /dev/null
+++ b/tests/stacked_overlay_bar.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+/plugin/;
+/ {
+	fragment@1 {
+		target = <&foo>;
+		__overlay__ {
+			overlay-1-property;
+			bar: barnode {
+				bar-property = "bar";
+			};
+		};
+	};
+};
diff --git a/tests/stacked_overlay_base.dts b/tests/stacked_overlay_base.dts
new file mode 100644
index 0000000..2916423
--- /dev/null
+++ b/tests/stacked_overlay_base.dts
@@ -0,0 +1,6 @@
+/dts-v1/;
+/ {
+	foo: foonode {
+		foo-property = "foo";
+	};
+};
diff --git a/tests/stacked_overlay_baz.dts b/tests/stacked_overlay_baz.dts
new file mode 100644
index 0000000..a52f0cc
--- /dev/null
+++ b/tests/stacked_overlay_baz.dts
@@ -0,0 +1,13 @@
+/dts-v1/;
+/plugin/;
+/ {
+	fragment@1 {
+		target = <&bar>;
+		__overlay__ {
+			overlay-2-property;
+			baz: baznode {
+				baz-property = "baz";
+			};
+		};
+	};
+};
-- 
2.1.4

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