tests: lib: devicetree: api: Add test_ranges_empty

Verify some DT API on an empty-valued `ranges;` property.

Signed-off-by: Grzegorz Swiderski <[email protected]>

Author: 57300

tests/lib/devicetree/api/app.overlay

@@ -556,6 +556,14 @@
 				ranges = <0x0 0x0 0x0 0x3eff0000 0x10000>,
 				         <0x0 0x10000000 0x0 0x10000000 0x2eff0000>;
 			};
+
+			test_ranges_empty: empty@2 {
+				reg = <0 2 1>;
+				#address-cells = <2>;
+				#size-cells = <1>;
+
+				ranges;
+			};
 		};
 
 		device-with-props-0 {

tests/lib/devicetree/api/src/main.c

@@ -89,6 +89,7 @@
 
 #define TEST_RANGES_PCIE  DT_NODELABEL(test_ranges_pcie)
 #define TEST_RANGES_OTHER DT_NODELABEL(test_ranges_other)
+#define TEST_RANGES_EMPTY DT_NODELABEL(test_ranges_empty)
 
 #define ZEPHYR_USER DT_PATH(zephyr_user)
 
@@ -2269,6 +2270,22 @@ ZTEST(devicetree_api, test_ranges_other)
 #undef LENGTH
 }
 
+ZTEST(devicetree_api, test_ranges_empty)
+{
+	zassert_equal(DT_NODE_HAS_PROP(TEST_RANGES_EMPTY, ranges), 1, "");
+
+	zassert_equal(DT_NUM_RANGES(TEST_RANGES_EMPTY), 0, "");
+
+	zassert_equal(DT_RANGES_HAS_IDX(TEST_RANGES_EMPTY, 0), 0, "");
+	zassert_equal(DT_RANGES_HAS_IDX(TEST_RANGES_EMPTY, 1), 0, "");
+
+#define FAIL(node_id, idx) ztest_test_fail();
+
+	DT_FOREACH_RANGE(TEST_RANGES_EMPTY, FAIL);
+
+#undef FAIL
+}
+
 ZTEST(devicetree_api, test_compat_get_any_status_okay)
 {
 	zassert_true(