tests: gstreamer: Test cameras' enumeration from GstDeviceProvider

Test the enumeration of the cameras through GstDeviceProvider against
the libcamera camera manager.

Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>

test/gstreamer/gstreamer_device_provider_test.cpp

@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2023, Umang Jain <umang.jain@ideasonboard.com>
+ *
+ * gstreamer_single_stream_test.cpp - GStreamer single stream capture test
+ */
+
+#include <vector>
+
+#include <libcamera/libcamera.h>
+#include <gst/gst.h>
+
+#include "gstreamer_test.h"
+#include "test.h"
+
+using namespace std;
+
+class GstreamerDeviceProviderTest : public GstreamerTest, public Test
+{
+public:
+	GstreamerDeviceProviderTest()
+		: GstreamerTest()
+	{
+	}
+
+protected:
+	int init() override
+	{
+		if (status_ != TestPass)
+			return status_;
+
+		return TestPass;
+	}
+
+	int run() override
+	{
+		g_autoptr(GstDeviceProvider) provider;
+		GList *devices, *l;
+		std::vector<std::string> cameraNames;
+		std::unique_ptr<libcamera::CameraManager> cm;
+
+		cm = std::make_unique<libcamera::CameraManager>();
+		cm->start();
+		for (auto &camera : cm->cameras())
+			cameraNames.push_back(camera->id());
+		cm->stop();
+		cm.reset();
+
+		provider = gst_device_provider_factory_get_by_name("libcameraprovider");
+		devices = gst_device_provider_get_devices(provider);
+
+		for (l = devices; l != NULL; l = g_list_next(l)) {
+			GstDevice *device = GST_DEVICE(l->data);
+			g_autofree gchar *gst_name;
+			bool matched = false;
+
+			g_autoptr(GstElement) element = gst_device_create_element(device, NULL);
+			g_object_get(element, "camera-name", &gst_name, NULL);
+
+			for (auto name : cameraNames) {
+				if (strcmp(name.c_str(), gst_name) == 0) {
+					matched = true;
+					break;
+				}
+			}
+
+			if (!matched)
+				return TestFail;
+		}
+
+		g_list_free_full(devices, (GDestroyNotify)gst_object_unref);
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(GstreamerDeviceProviderTest)

test/gstreamer/meson.build

@@ -7,6 +7,7 @@ endif
 gstreamer_tests = [
     {'name': 'single_stream_test', 'sources': ['gstreamer_single_stream_test.cpp']},
     {'name': 'multi_stream_test', 'sources': ['gstreamer_multi_stream_test.cpp']},
+    {'name': 'device_provider_test', 'sources': ['gstreamer_device_provider_test.cpp']},
 ]
 gstreamer_dep = dependency('gstreamer-1.0', required: true)