First cut of pulling out the relevant parts of my original game to make a little framework.

tests/pathing.cpp

@@ -0,0 +1,53 @@
+#include <catch2/catch_test_macros.hpp>
+#include <fmt/core.h>
+#include <nlohmann/json.hpp>
+#include <fstream>
+#include "algos/pathing.hpp"
+#include "algos/matrix.hpp"
+#include "ai/ai.hpp"
+#include "game/level.hpp"
+#include <chrono>
+#include <thread>
+#include "algos/rand.hpp"
+#include "game/systems.hpp"
+#include "constants.hpp"
+
+using namespace fmt;
+using namespace nlohmann;
+using std::string;
+using namespace components;
+using namespace std::chrono_literals;
+
+json load_test_pathing(const string &fname) {
+  std::ifstream infile(fname);
+  return json::parse(infile);
+}
+
+TEST_CASE("multiple targets can path", "[pathing]") {
+  GameDB::init();
+  auto level = GameDB::create_level();
+  auto walls_copy = level.map->$walls;
+  Pathing paths{matrix::width(walls_copy), matrix::height(walls_copy)};
+
+  System::multi_path<Combat>(level, paths, walls_copy);
+
+  bool diag = Random::uniform<int>(0, 1);
+  auto pos = GameDB::player_position().location;
+  auto found = paths.find_path(pos, PATHING_TOWARD, diag);
+
+  while(found == PathingResult::CONTINUE) {
+    // fmt::println("\033[2J\033[1;1H");
+    // matrix::dump(diag ? "diag" : "simple", paths.$paths, pos.x, pos.y);
+    // std::this_thread::sleep_for(200ms);
+    found = paths.find_path(pos, PATHING_TOWARD, diag);
+  }
+
+  // fmt::println("\033[2J\033[1;1H");
+  // matrix::dump(diag ? "diag" : "simple", paths.$paths, pos.x, pos.y);
+
+  if(found == PathingResult::FOUND) {
+    fmt::println("FOUND!");
+  } else if(found == PathingResult::FAIL && !diag) {
+    REQUIRE(found != PathingResult::FAIL);
+  }
+}