home-manager/tests/modules/programs/wezterm/settings-with-extra-config.nix

{
  programs.wezterm = {
    enable = true;
    settings = {
      font_size = 13;
    };
    extraConfig = ''
      return {
        color_scheme = "Tomorrow Night",
      }
    '';
  };

  nmt.script =
    let
      expectedConfig = builtins.toFile "wezterm.lua" ''
        -- Generated by Home Manager.
        -- See https://wezfurlong.org/wezterm/

        local wezterm = require 'wezterm'
        local config = wezterm.config_builder and wezterm.config_builder() or {}

        local hm_config = {
          ["font_size"] = 13
        }
        for k, v in pairs(hm_config) do
          config[k] = v
        end

        local _hm_extra = (function()
          return {
          color_scheme = "Tomorrow Night",
        }

        end)()
        if type(_hm_extra) == "table" then
          for k, v in pairs(_hm_extra) do
            config[k] = v
          end
        end

        return config
      '';
    in
    ''
      assertFileExists home-files/.config/wezterm/wezterm.lua
      assertFileContent home-files/.config/wezterm/wezterm.lua ${expectedConfig}
    '';
}