test: Add signal/slot test

The test covers signal connection, disconnection through all the
provided methods, emission, parameters, and connection of a signal to
multiple slots.

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

2 files changed, 160 insertions, 0 deletions

diff --git a/test/meson.build b/test/meson.build
index 30350d22..4000bd51 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -4,6 +4,7 @@ subdir('media_device')
 
 public_tests = [
     ['list-cameras',    'list-cameras.cpp'],
+    ['signal',          'signal.cpp'],
 ]
 
 internal_tests = [
diff --git a/test/signal.cpp b/test/signal.cpp
new file mode 100644
index 00000000..ab69ca1b
--- /dev/null
+++ b/test/signal.cpp
@@ -0,0 +1,159 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2019, Google Inc.
+ *
+ * signal.cpp - Signal test
+ */
+
+#include <iostream>
+#include <string.h>
+
+#include <libcamera/signal.h>
+
+#include "test.h"
+
+using namespace std;
+using namespace libcamera;
+
+static int valueStatic_ = 0;
+
+static void slotStatic(int value)
+{
+	valueStatic_ = value;
+}
+
+class SignalTest : public Test
+{
+protected:
+	void slotVoid()
+	{
+		called_ = true;
+	}
+
+	void slotDisconnect()
+	{
+		called_ = true;
+		signalVoid_.disconnect(this, &SignalTest::slotDisconnect);
+	}
+
+	void slotInteger1(int value)
+	{
+		values_[0] = value;
+	}
+
+	void slotInteger2(int value)
+	{
+		values_[1] = value;
+	}
+
+	void slotMultiArgs(int value, const std::string &name)
+	{
+		values_[2] = value;
+		name_ = name;
+	}
+
+	int init()
+	{
+		return 0;
+	}
+
+	int run()
+	{
+		/* Test signal emission and reception. */
+		called_ = false;
+		signalVoid_.connect(this, &SignalTest::slotVoid);
+		signalVoid_.emit();
+
+		if (!called_) {
+			cout << "Signal emission test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test signal with parameters. */
+		values_[2] = 0;
+		name_.clear();
+		signalMultiArgs_.connect(this, &SignalTest::slotMultiArgs);
+		signalMultiArgs_.emit(42, "H2G2");
+
+		if (values_[2] != 42 || name_ != "H2G2") {
+			cout << "Signal parameters test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test signal connected to multiple slots. */
+		memset(values_, 0, sizeof(values_));
+		valueStatic_ = 0;
+		signalInt_.connect(this, &SignalTest::slotInteger1);
+		signalInt_.connect(this, &SignalTest::slotInteger2);
+		signalInt_.connect(&slotStatic);
+		signalInt_.emit(42);
+
+		if (values_[0] != 42 || values_[1] != 42 || values_[2] != 0 ||
+		    valueStatic_ != 42) {
+			cout << "Signal multi slot test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test disconnection of a single slot. */
+		memset(values_, 0, sizeof(values_));
+		signalInt_.disconnect(this, &SignalTest::slotInteger2);
+		signalInt_.emit(42);
+
+		if (values_[0] != 42 || values_[1] != 0 || values_[2] != 0) {
+			cout << "Signal slot disconnection test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test disconnection of a whole object. */
+		memset(values_, 0, sizeof(values_));
+		signalInt_.disconnect(this);
+		signalInt_.emit(42);
+
+		if (values_[0] != 0 || values_[1] != 0 || values_[2] != 0) {
+			cout << "Signal object disconnection test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test disconnection of a whole signal. */
+		memset(values_, 0, sizeof(values_));
+		signalInt_.connect(this, &SignalTest::slotInteger1);
+		signalInt_.connect(this, &SignalTest::slotInteger2);
+		signalInt_.disconnect();
+		signalInt_.emit(42);
+
+		if (values_[0] != 0 || values_[1] != 0 || values_[2] != 0) {
+			cout << "Signal object disconnection test failed" << endl;
+			return TestFail;
+		}
+
+		/* Test disconnection from slot. */
+		signalVoid_.disconnect();
+		signalVoid_.connect(this, &SignalTest::slotDisconnect);
+
+		signalVoid_.emit();
+		called_ = false;
+		signalVoid_.emit();
+
+		if (called_) {
+			cout << "Signal disconnection from slot test failed" << endl;
+			return TestFail;
+		}
+
+		return TestPass;
+	}
+
+	void cleanup()
+	{
+	}
+
+private:
+	Signal<> signalVoid_;
+	Signal<int> signalInt_;
+	Signal<int, const std::string &> signalMultiArgs_;
+
+	bool called_;
+	int values_[3];
+	std::string name_;
+};
+
+TEST_REGISTER(SignalTest)