Did a full code coverage review and improved many of the tests and a bunch of code. I'll do one more final walk through all the code before getting back to work on the new combat system.

tests/components.cpp

@@ -3,6 +3,7 @@
 #include "dinkyecs.hpp"
 #include "config.hpp"
 #include <iostream>
+#include "easings.hpp"
 
 using namespace components;
 using namespace DinkyECS;
@@ -27,3 +28,66 @@ TEST_CASE("confirm component loading works", "[components]") {
     }
   }
 }
+
+TEST_CASE("make sure json_mods works", "[components]") {
+  Config config("assets/bosses.json");
+  // this confirms that loading something with an optional
+  // field works with the json conversions in json_mods.hpp
+  for(auto& comp_data : config["RAT_KING"]["components"]) {
+    if(comp_data["_type"] == "BossFight") {
+      auto comp = components::convert<components::BossFight>(comp_data);
+      // the boss fight for the rat king doesn't have a stage so false=optional
+      REQUIRE(comp.stage == std::nullopt);
+    }
+  }
+
+  // this then confirms everything else about the json conversion
+
+  ComponentMap comp_map;
+  components::configure(comp_map);
+
+  DinkyECS::World world;
+  auto rat_king = world.entity();
+
+  components::configure_entity(comp_map, world, rat_king, config["RAT_KING"]["components"]);
+
+  auto boss = world.get<BossFight>(rat_king);
+  REQUIRE(boss.stage == std::nullopt);
+
+  // now load the other one for the other way optional is used
+  auto devils_fingers = world.entity();
+  components::configure_entity(comp_map, world, devils_fingers, config["DEVILS_FINGERS"]["components"]);
+  auto boss2 = world.get<BossFight>(devils_fingers);
+  REQUIRE(boss2.stage != std::nullopt);
+}
+
+
+TEST_CASE("animation component special cases", "[components]") {
+  Animation anim;
+
+  anim.easing = ease::NONE;
+  float res = anim.twitching();
+  REQUIRE(res == 0.0);
+
+  anim.easing = ease::SINE;
+  anim.subframe = 1.0f;
+  res = anim.twitching();
+  REQUIRE(!std::isnan(res));
+
+  anim.easing = ease::OUT_CIRC;
+  res = anim.twitching();
+  REQUIRE(!std::isnan(res));
+
+  anim.easing = ease::OUT_BOUNCE;
+  res = anim.twitching();
+  REQUIRE(!std::isnan(res));
+
+  anim.easing = ease::IN_OUT_BACK;
+  res = anim.twitching();
+  REQUIRE(!std::isnan(res));
+
+  anim.easing = ease::FUCKFACE;
+  bool throws = false;
+  try { anim.twitching(); } catch(...) { throws = true; }
+  REQUIRE(throws);
+}