tests: Add tst_dummyplatform

Its only purpose is to instantiate some classes so we're sure
they implement all needed pure virtuals

The dummy platform is just used for copy-pasting into a new
platform, so let's cover as much boiler-plate as possible

tests/CMakeLists.txt

@@ -66,6 +66,9 @@ target_link_libraries(tst_window kddockwidgets kdbindings)
 add_executable(tst_platform tst_platform.cpp ${TESTING_RESOURCES})
 target_link_libraries(tst_platform kddockwidgets kdbindings)
 
+add_executable(tst_dummyplatform tst_dummyplatform.cpp ${TESTING_RESOURCES})
+target_link_libraries(tst_dummyplatform kddockwidgets kdbindings)
+
 add_executable(tst_group controllers/tst_group.cpp ${TESTING_RESOURCES})
 target_link_libraries(tst_group kddockwidgets kdbindings)
 

tests/tst_dummyplatform.cpp

@@ -0,0 +1,38 @@
+/*
+  This file is part of KDDockWidgets.
+
+  SPDX-FileCopyrightText: 2019-2022 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
+  Author: Sérgio Martins <sergio.martins@kdab.com>
+
+  SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+  Contact KDAB at <info@kdab.com> for commercial licensing options.
+*/
+
+#define DOCTEST_CONFIG_IMPLEMENT
+
+#include "Platform.h"
+#include "dummy/Window_dummy.h"
+
+#include <doctest/doctest.h>
+
+using namespace KDDockWidgets;
+
+
+TEST_CASE("Test pure-virtuals implemented")
+{
+    Window_dummy dummy;
+}
+
+int main(int argc, char **argv)
+{
+    doctest::Context ctx;
+    ctx.applyCommandLine(argc, argv);
+
+    Platform::tests_initPlatform(argc, argv, FrontendType::Dummy);
+
+    const int exitCode = ctx.run();
+    Platform::tests_deinitPlatform();
+
+    return exitCode;
+}