Add some graphics tests.

test/graphics/TestOpenGlRendering.cpp

@@ -0,0 +1,42 @@
+#include "DesktopManager.h"
+#include "XcbInterface.h"
+
+#include "TestCase.h"
+#include "TestCaseRunner.h"
+
+#include <memory>
+#include <string>
+#include <iostream>
+
+class TestOpenGlRendering : public TestCase
+{
+public:
+    bool Run() override
+    {
+        auto desktopManager = DesktopManager::Create();
+
+        auto mainWindow = desktopManager->GetWindowManager()->GetMainWindow();
+        mainWindow->SetSize(800, 600);
+
+        bool useOpenGl = true;
+        XcbInterface window_interface;
+        window_interface.SetUseOpenGl(true);
+        window_interface.Initialize(desktopManager.get());
+        window_interface.AddWindow(mainWindow, desktopManager.get());
+        window_interface.ShowWindow(mainWindow);
+        window_interface.CreateOpenGlDrawable(mainWindow);
+        window_interface.Loop(desktopManager.get());
+        window_interface.ShutDown();
+
+        return true;
+    }
+};
+
+int main()
+{
+    TestCaseRunner runner;
+    runner.AddTestCase("TestOpenGlRendering", std::make_unique<TestOpenGlRendering>());
+
+    const auto testsPassed = runner.Run();
+    return testsPassed ? 0 : -1;
+}