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

tests/config.cpp

@@ -0,0 +1,28 @@
+#include <catch2/catch_test_macros.hpp>
+#include "game/config.hpp"
+#include <iostream>
+
+TEST_CASE("confirm basic config loader ops", "[config]") {
+  settings::Config::set_base_dir("./");
+  auto config = settings::get("devices");
+  auto data_list = config.json();
+  auto the_keys = config.keys();
+
+  REQUIRE(the_keys.size() > 0);
+
+  for(auto& [key, data] : data_list.items()) {
+    auto wide1 = config.wstring(key, "name");
+    auto& comps = data["components"];
+
+    for(auto& comp_data : comps) {
+      REQUIRE(comp_data.contains("_type"));
+    }
+  }
+
+  auto indexed = settings::get("tests/config_test.json");
+  auto& test_0 = indexed[0];
+  REQUIRE(test_0["test"] == 0);
+
+  auto& test_1 = indexed[1];
+  REQUIRE(test_1["test"] == 1);
+}