Use modern cmake testing functionality including catch integration

test/src/Main.cpp

@@ -1,2 +0,0 @@
-#define CATCH_CONFIG_MAIN
-#include <catch.hpp>

test/src/Rect.cpp

@@ -1,3 +1,5 @@
+#define CATCH_CONFIG_MAIN
+
 #include <SFML/Graphics/Rect.hpp>
 #include <SFML/System/Vector2.hpp>
 #include "TestUtilities/Graphics.hpp"

test/src/Vector2.cpp

@@ -1,3 +1,5 @@
+#define CATCH_CONFIG_MAIN
+
 #include <SFML/System/Vector2.hpp>
 #include "TestUtilities/System.hpp"
 

test/src/Window.cpp

@@ -0,0 +1,10 @@
+#define CATCH_CONFIG_MAIN
+
+#include <SFML/Graphics/Rect.hpp>
+#include <SFML/System/Vector2.hpp>
+#include "TestUtilities/Window.hpp"
+
+TEST_CASE("Window unit test exists", "[window]")
+{
+    CHECK(TRUE);
+}