diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index f8ae353c5..3946afef5 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -12,6 +12,7 @@
 /modules/misc/gtk.nix                                 @rycee
 
 /modules/config/i18n.nix                              @midchildan
+/tests/modules/config/i18n                            @midchildan
 
 /modules/misc/news.nix                                @rycee
 
diff --git a/modules/config/i18n.nix b/modules/config/i18n.nix
index 18eb40fc3..9fca360da 100644
--- a/modules/config/i18n.nix
+++ b/modules/config/i18n.nix
@@ -1,4 +1,4 @@
-# The glibc package in nixpkgs is patched to make it possbile to specify
+# The glibc package in Nixpkgs is patched to make it possible to specify
 # an alternative path for the locale archive through a special environment
 # variable. This would allow different versions of glibc to coexist on the
 # same system because each version of glibc could look up different paths
@@ -6,11 +6,11 @@
 # incompatible ways.
 #
 # See also:
-# localedef(1)
-# https://nixos.org/manual/nixpkgs/stable/#locales
-# https://github.com/NixOS/nixpkgs/issues/38991
+# - localedef(1)
+# - https://nixos.org/manual/nixpkgs/stable/#locales
+# - https://github.com/NixOS/nixpkgs/issues/38991
 #
-# XXX: The name of the said environment variable gets updated with each
+# Note, the name of the said environment variable gets updated with each
 # breaking release of the glibcLocales package. Periodically check the link
 # below for changes:
 # https://github.com/NixOS/nixpkgs/blob/nixpkgs-unstable/pkgs/development/libraries/glibc/nix-locale-archive.patch
@@ -20,25 +20,27 @@
 with lib;
 
 let
+
   inherit (pkgs.glibcLocales) version;
 
   archivePath = "${pkgs.glibcLocales}/lib/locale/locale-archive";
 
   # lookup the version of glibcLocales and set the appropriate environment vars
-  localeVars = if (versionAtLeast version "2.27") then {
+  localeVars = if versionAtLeast version "2.27" then {
     LOCALE_ARCHIVE_2_27 = archivePath;
-  } else if (versionAtLeast version "2.11") then {
+  } else if versionAtLeast version "2.11" then {
     LOCALE_ARCHIVE_2_11 = archivePath;
   } else
     { };
+
 in {
+  meta.maintainers = with maintainers; [ midchildan ];
+
   config = {
-    # for shell sessions
+    # For shell sessions.
     home.sessionVariables = localeVars;
 
-    # for desktop apps
+    # For desktop apps.
     systemd.user.sessionVariables = localeVars;
   };
-
-  meta.maintainers = with maintainers; [ midchildan ];
 }
diff --git a/tests/modules/home-environment/session-path.nix b/tests/modules/home-environment/session-path.nix
index 08477c5a7..57cfeceda 100644
--- a/tests/modules/home-environment/session-path.nix
+++ b/tests/modules/home-environment/session-path.nix
@@ -1,30 +1,15 @@
 { config, lib, pkgs, ... }:
 
-let inherit (pkgs.stdenv.hostPlatform) isLinux;
-in {
+{
   imports = [
     ({ ... }: { config.home.sessionPath = [ "foo" ]; })
     ({ ... }: { config.home.sessionPath = [ "bar" "baz" ]; })
   ];
 
   nmt.script = ''
-    assertFileExists home-path/etc/profile.d/hm-session-vars.sh
-    assertFileContent \
-      home-path/etc/profile.d/hm-session-vars.sh \
-      ${
-        pkgs.writeText "session-path-expected.txt" ''
-          # Only source this once.
-          if [ -n "$__HM_SESS_VARS_SOURCED" ]; then return; fi
-          export __HM_SESS_VARS_SOURCED=1
-          ${lib.optionalString isLinux ''
-
-            export LOCALE_ARCHIVE_2_27="${pkgs.glibcLocales}/lib/locale/locale-archive"''}
-          export XDG_CACHE_HOME="/home/hm-user/.cache"
-          export XDG_CONFIG_HOME="/home/hm-user/.config"
-          export XDG_DATA_HOME="/home/hm-user/.local/share"
-          export PATH="$PATH''${PATH:+:}bar:baz:foo"
-        ''
-      }
+    hmSessVars=home-path/etc/profile.d/hm-session-vars.sh
+    assertFileExists $hmSessVars
+    assertFileContains $hmSessVars \
+      'export PATH="$PATH''${PATH:+:}bar:baz:foo"'
   '';
-
 }
diff --git a/tests/modules/home-environment/session-variables.nix b/tests/modules/home-environment/session-variables.nix
index 87c044f14..d939c05eb 100644
--- a/tests/modules/home-environment/session-variables.nix
+++ b/tests/modules/home-environment/session-variables.nix
@@ -1,17 +1,36 @@
 { config, lib, pkgs, ... }:
 
-with lib;
-
 let
-  inherit (pkgs.stdenv.hostPlatform) isLinux;
 
-  expectedConf = pkgs.substituteAll {
-    src = ./session-variables-expected.txt;
-    # the blank space below is intentional
-    exportLocaleVar = optionalString isLinux ''
+  inherit (pkgs.stdenv.hostPlatform) isDarwin;
+
+  linuxExpected = ''
+    # Only source this once.
+    if [ -n "$__HM_SESS_VARS_SOURCED" ]; then return; fi
+    export __HM_SESS_VARS_SOURCED=1
+
+    export LOCALE_ARCHIVE_2_27="${pkgs.glibcLocales}/lib/locale/locale-archive"
+    export V1="v1"
+    export V2="v2-v1"
+    export XDG_CACHE_HOME="/home/hm-user/.cache"
+    export XDG_CONFIG_HOME="/home/hm-user/.config"
+    export XDG_DATA_HOME="/home/hm-user/.local/share"
+  '';
+
+  darwinExpected = ''
+    # Only source this once.
+    if [ -n "$__HM_SESS_VARS_SOURCED" ]; then return; fi
+    export __HM_SESS_VARS_SOURCED=1
+
+    export V1="v1"
+    export V2="v2-v1"
+    export XDG_CACHE_HOME="/home/hm-user/.cache"
+    export XDG_CONFIG_HOME="/home/hm-user/.config"
+    export XDG_DATA_HOME="/home/hm-user/.local/share"
+  '';
+
+  expected = pkgs.writeText "expected" (if isDarwin then darwinExpected else linuxExpected);
 
-      export LOCALE_ARCHIVE_2_27="${pkgs.glibcLocales}/lib/locale/locale-archive"'';
-  };
 in {
   config = {
     home.sessionVariables = {
@@ -22,7 +41,7 @@ in {
     nmt.script = ''
       assertFileExists home-path/etc/profile.d/hm-session-vars.sh
       assertFileContent home-path/etc/profile.d/hm-session-vars.sh \
-        ${expectedConf}
+        ${expected}
     '';
   };
 }
diff --git a/tests/modules/systemd/session-variables.nix b/tests/modules/systemd/session-variables.nix
index d00844eb0..59d1a4d3a 100644
--- a/tests/modules/systemd/session-variables.nix
+++ b/tests/modules/systemd/session-variables.nix
@@ -1,13 +1,6 @@
 { config, lib, pkgs, ... }:
 
-with lib;
-
-let
-  expectedConf = pkgs.substituteAll {
-    src = ./session-variables-expected.conf;
-    inherit (pkgs) glibcLocales;
-  };
-in {
+{
   config = {
     systemd.user.sessionVariables = {
       V_int = 1;
@@ -17,7 +10,11 @@ in {
     nmt.script = ''
       envFile=home-files/.config/environment.d/10-home-manager.conf
       assertFileExists $envFile
-      assertFileContent $envFile ${expectedConf}
+      assertFileContent $envFile ${pkgs.writeText "expected" ''
+        LOCALE_ARCHIVE_2_27=${pkgs.glibcLocales}/lib/locale/locale-archive
+        V_int=1
+        V_str=2
+      ''}
     '';
   };
 }