test: Add Message test case

The Message class test creates a receiver inheriting from Object, moves
it to a different thread, sends a message to the receiver and verifies
that the message is delivered in the correct thread.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

test/message.cpp

@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * message.cpp - Messages test
+ */
+
+#include <chrono>
+#include <iostream>
+#include <thread>
+
+#include "message.h"
+#include "thread.h"
+#include "test.h"
+#include "utils.h"
+
+using namespace std;
+using namespace libcamera;
+
+class MessageReceiver : public Object
+{
+public:
+	enum Status {
+		NoMessage,
+		InvalidThread,
+		MessageReceived,
+	};
+
+	MessageReceiver()
+		: status_(NoMessage)
+	{
+	}
+
+	Status status() const { return status_; }
+	void reset() { status_ = NoMessage; }
+
+protected:
+	void message(Message *msg)
+	{
+		if (thread() != Thread::current())
+			status_ = InvalidThread;
+		else
+			status_ = MessageReceived;
+	}
+
+private:
+	Status status_;
+};
+
+class MessageTest : public Test
+{
+protected:
+	int run()
+	{
+		MessageReceiver receiver;
+		receiver.moveToThread(&thread_);
+
+		thread_.start();
+
+		receiver.postMessage(utils::make_unique<Message>(Message::None));
+
+		this_thread::sleep_for(chrono::milliseconds(100));
+
+		switch (receiver.status()) {
+		case MessageReceiver::NoMessage:
+			cout << "No message received" << endl;
+			return TestFail;
+		case MessageReceiver::InvalidThread:
+			cout << "Message received in incorrect thread" << endl;
+			return TestFail;
+		default:
+			break;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup()
+	{
+		thread_.exit(0);
+		thread_.wait();
+	}
+
+private:
+	Thread thread_;
+};
+
+TEST_REGISTER(MessageTest)