I have a test now that can generate a map image so I'll make it look nice there before bringing the code into the game.

tests/map.cpp

@@ -15,6 +15,7 @@ json load_test_data(const string &fname) {
 }
 
 TEST_CASE("camera control", "[map]") {
+  textures::init();
   components::init();
   LevelManager levels;
   GameLevel level = levels.current();
@@ -33,6 +34,7 @@ TEST_CASE("camera control", "[map]") {
 }
 
 TEST_CASE("map placement test", "[map:placement]") {
+  textures::init();
   components::init();
   for(int i = 0; i < 20; i++) {
     LevelManager levels;
@@ -51,6 +53,7 @@ TEST_CASE("map placement test", "[map:placement]") {
 }
 
 TEST_CASE("dijkstra algo test", "[map]") {
+  textures::init();
   json data = load_test_data("./tests/dijkstra.json");
 
   for(auto &test : data) {
@@ -76,3 +79,53 @@ TEST_CASE("dijkstra algo test", "[map]") {
     // FIX ME: REQUIRE(paths == expected);
   }
 }
+
+
+TEST_CASE("map image test", "[map-sprite]") {
+  components::init();
+  textures::init();
+  LevelManager levels;
+  GameLevel level = levels.current();
+  auto &walls = level.map->tiles();
+  auto &tile_set = textures::get_map_tile_set();
+
+  sf::Vector2i size{64,64};
+  matrix::dump("TILES?", walls);
+
+  std::unordered_map<wchar_t, sf::Vector2i> sprite_coord;
+
+  Config config("./assets/map_tiles.json");
+  json& tiles = config.json();
+
+  for(auto tile : tiles) {
+    sf::Vector2i coords{tile["x"], tile["y"]};
+    sprite_coord.insert_or_assign(tile["display"], coords);
+  }
+
+  sf::Vector2u dim{
+    (unsigned int)matrix::width(walls) * size.x,
+    (unsigned int)matrix::height(walls) * size.y};
+
+  sf::RenderTexture render{dim};
+  render.clear({50,50,50,255});
+
+  sf::Texture map_sprites{"./assets/map_tiles.png"};
+
+  for(matrix::each_row it{walls}; it.next();) {
+    size_t tid = walls[it.y][it.x];
+    wchar_t display = tile_set[tid];
+    REQUIRE(sprite_coord.contains(display));
+
+    auto coords = sprite_coord.at(display);
+    sf::IntRect square{coords, size};
+    sf::Sprite sprite{map_sprites, square};
+    sprite.setColor({150,150,150,255});
+    sprite.setPosition({float(it.x) * float(size.x), float(it.y) * float(size.y)});
+    render.draw(sprite);
+  }
+
+  render.display();
+  sf::Image out_img = render.getTexture().copyToImage();
+  bool worked = out_img.saveToFile("map_test.png");
+  REQUIRE(worked);
+}