tests: kernel: device: expand device api coverage

Add test coverage for device device_get_by_dt_nodelabel() API

Signed-off-by: Abderrahmane JARMOUNI <git@jarmouni.me>

Author: JarmouniA

tests/kernel/device/app.overlay

@@ -17,7 +17,7 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
-	fakedriver@E0000000 {
+	fake_driver_label: fakedriver@E0000000 {
 		compatible = "fakedriver";
 		reg = <0xE0000000 0x2000>;
 		status = "okay";

tests/kernel/device/src/main.c

@@ -26,6 +26,9 @@
 #define FAKEDEFERDRIVER0	DEVICE_DT_GET(DT_PATH(fakedeferdriver_e7000000))
 #define FAKEDEFERDRIVER1	DEVICE_DT_GET(DT_PATH(fakedeferdriver_e8000000))
 
+#define FAKEDRIVER0_NODEID    DT_PATH(fakedriver_e0000000)
+#define FAKEDRIVER0_NODELABEL "fake_driver_label"
+
 /* A device without init call */
 DEVICE_DEFINE(dummy_noinit, DUMMY_NOINIT, NULL, NULL, NULL, NULL,
 	      POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, NULL);
@@ -476,6 +479,26 @@ ZTEST(device, test_deinit_success_and_redeinit)
 	zassert_equal(ret, -EPERM, "device_deinit should fail when not init or already deinit");
 }
 
+#ifdef CONFIG_DEVICE_DT_METADATA
+DEVICE_DT_DEFINE(FAKEDRIVER0_NODEID, NULL, NULL, NULL, NULL, POST_KERNEL,
+		 CONFIG_KERNEL_INIT_PRIORITY_DEFAULT, NULL);
+
+ZTEST(device, test_device_get_by_dt_nodelabel)
+{
+	const struct device *dev = DEVICE_DT_GET(FAKEDRIVER0_NODEID);
+
+	zassert_not_null(dev);
+
+	const struct device *valid = device_get_by_dt_nodelabel(FAKEDRIVER0_NODELABEL);
+
+	zassert_not_null(valid, "Valid DT nodelabel should return a device");
+
+	const struct device *invalid = device_get_by_dt_nodelabel("does_not_exist");
+
+	zassert_is_null(invalid, "Invalid DT nodelabel should return NULL");
+}
+#endif
+
 void *user_setup(void)
 {
 #ifdef CONFIG_USERSPACE

tests/kernel/device/testcase.yaml

@@ -13,6 +13,7 @@ tests:
   kernel.device.metadata:
     platform_allow:
       - qemu_x86
+      - native_sim
     extra_configs:
       - CONFIG_DEVICE_DT_METADATA=y
   kernel.device.minimallibc: