test: v4l2_device: Add request_buffers test

Add a utility to the test suite to request and allocate buffers from
a V4L2Device to ensure it functions correctly.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/v4l2_device/request_buffers.cpp

@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * libcamera V4L2 API tests
+ */
+
+#include "v4l2_device_test.h"
+
+class RequestBuffersTest : public V4L2DeviceTest
+{
+protected:
+	int run()
+	{
+		/*
+		 * TODO:
+		 *  Test invalid requests
+		 *  Test different buffer allocations
+		 */
+		const unsigned int bufferCount = 8;
+
+		createBuffers(bufferCount);
+
+		int ret = dev_->exportBuffers(bufferCount, &pool_);
+		if (ret)
+			return TestFail;
+
+		return TestPass;
+	}
+};
+
+TEST_REGISTER(RequestBuffersTest);