Separated test suites into their individual modules

- Building per module only requires to have split test utility sections
- System module tests are always added, as the system module is always built

test/src/TestUtilities/Graphics.hpp

@@ -0,0 +1,23 @@
+// Header for SFML unit tests.
+//
+// For a new graphics module test case, include this header and not <catch.hpp> directly.
+// This ensures that string conversions are visible and can be used by Catch for debug output.
+
+#ifndef SFML_TESTUTILITIES_GRAPHICS_HPP
+#define SFML_TESTUTILITIES_GRAPHICS_HPP
+
+#include "Window.hpp"
+
+// Forward declarations for non-template types
+namespace sf
+{
+    class Color;
+}
+
+// String conversions for Catch framework
+namespace Catch
+{
+    std::string toString(const sf::Color& color);
+}
+
+#endif // SFML_TESTUTILITIES_GRAPHICS_HPP