I now have hacked in basic color for the wall tiles but not enemies and items.

tests/map.cpp

@@ -121,7 +121,7 @@ TEST_CASE("map image test", "[map-sprite]") {
     auto coords = sprite_coord.at(display);
     sf::IntRect square{coords, {size.x, size.y}};
     sf::Sprite sprite{map_sprites, square};
-    sprite.setColor({150,150,150,255});
+    // sprite.setColor({150,150,150,255});
     sprite.setPosition({float(it.x * size.x), float(it.y * size.y)});
     render.draw(sprite);
   }