init wrapper-module config

tests/init.lua

@@ -0,0 +1,28 @@
+local function assert_ok(value, message)
+  if not value then
+    error(message or "assertion failed")
+  end
+end
+
+local ok, nix = pcall(require, "config.nix")
+assert_ok(ok, "Failed to require config.nix")
+
+local init_ok, helper = pcall(function()
+  return nix.init({ non_nix_value = true })
+end)
+assert_ok(init_ok and helper, "Failed to initialize config.nix helper")
+
+-- Basic shape checks
+assert_ok(type(helper.is_nix) == "boolean", "Expected helper.is_nix to be boolean")
+
+-- Cat/setting access should return defaults without errors
+local cat_value = helper.get_cat("general", true)
+assert_ok(type(cat_value) == "boolean", "Expected get_cat to return boolean")
+
+local background = helper.get_setting("dark", "background")
+assert_ok(type(background) == "string", "Expected get_setting to return string")
+
+local info_value = helper.get_info("nvim", "nixCats_configDirName")
+assert_ok(type(info_value) == "string", "Expected get_info to return string")
+
+print("[tests/init.lua] nix helper smoke test passed")