home-manager/tests/modules/config/i18n/default.nix

{
  i18n = {
    config = {
      nmt.script = ''
        hmEnvFile=home-path/etc/profile.d/hm-session-vars.sh
        assertFileExists $hmEnvFile
        assertFileRegex $hmEnvFile \
          '^export LOCALE_ARCHIVE_._..=".*/lib/locale/locale-archive"$'

        envFile=home-files/.config/environment.d/10-home-manager.conf
        assertFileExists $envFile
        assertFileRegex $envFile \
          '^LOCALE_ARCHIVE_._..=.*/lib/locale/locale-archive$'
      '';
    };
  };

  i18n-custom-locales =
    { config, pkgs, ... }:
    {
      config =
        let
          customGlibcLocales = pkgs.glibcLocales.override {
            allLocales = false;
            locales = [ "en_US.UTF-8/UTF-8" ];
          };
        in
        {
          i18n.glibcLocales = customGlibcLocales;

          nmt.script = ''
            hmEnvFile=home-path/etc/profile.d/hm-session-vars.sh
            assertFileExists $hmEnvFile
            assertFileRegex $hmEnvFile 'LOCALE_ARCHIVE_.*${customGlibcLocales}'

            envFile=home-files/.config/environment.d/10-home-manager.conf
            assertFileExists $envFile
            assertFileRegex $envFile 'LOCALE_ARCHIVE_.*${customGlibcLocales}'
          '';
        };
    };
}