tests: Add a test case for the omit-if-no-ref keyword

The newly introduced /omit-if-no-ref/ needs a few test cases, make
sure to test them.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/omit-no-ref.dts

@@ -0,0 +1,26 @@
+/dts-v1/;
+
+/ {
+	test-phandle = <&node3>;
+	test-path = &node4;
+
+	/omit-if-no-ref/ node1: node1 {
+		bar = <0xdeadbeef>;
+	};
+
+	node2: node2 {
+		foo = <0x42>;
+	};
+
+	node3: node3 {
+		test = "test";
+	};
+
+	node4: node4 {
+		test;
+	};
+};
+
+/omit-if-no-ref/ &node2;
+/omit-if-no-ref/ &node3;
+/omit-if-no-ref/ &node4;

tests/run_tests.sh

@@ -568,6 +568,13 @@ dtc_tests () {
     run_dtc_test -I dts -O dtb -o dtc_tree1_delete.test.dtb test_tree1_delete.dts
     tree1_tests dtc_tree1_delete.test.dtb
 
+    # Check omit-if-no-ref functionality
+    run_dtc_test -I dts -O dtb -o omit-no-ref.test.dtb omit-no-ref.dts
+    run_test check_path omit-no-ref.test.dtb not-exists "/node1"
+    run_test check_path omit-no-ref.test.dtb not-exists "/node2"
+    run_test check_path omit-no-ref.test.dtb exists "/node3"
+    run_test check_path omit-no-ref.test.dtb exists "/node4"
+
     run_dtc_test -I dts -O dts -o delete_reinstate_multilabel.dts.test.dts delete_reinstate_multilabel.dts
     run_wrap_test cmp delete_reinstate_multilabel.dts.test.dts delete_reinstate_multilabel_ref.dts