fontconfig: add test for font discovery

modules/misc/fontconfig.nix

@@ -14,8 +14,6 @@ let
 
   cfg = config.fonts.fontconfig;
 
-  inherit (config.home) profileDirectory;
-
   globalConfig = config;
   fontConfigFileType = lib.types.submodule (
     { name, ... }:
@@ -298,8 +296,8 @@ in
 
             <dir>${config.home.path}/lib/X11/fonts</dir>
             <dir>${config.home.path}/share/fonts</dir>
-            <dir>${profileDirectory}/lib/X11/fonts</dir>
-            <dir>${profileDirectory}/share/fonts</dir>
+            <dir>${config.home.profileDirectory}/lib/X11/fonts</dir>
+            <dir>${config.home.profileDirectory}/share/fonts</dir>
 
             <cachedir>${config.home.path}/lib/fontconfig/cache</cachedir>
           '';

tests/modules/misc/fontconfig/default.nix

@@ -7,6 +7,7 @@
   fontconfig-default-rendering = ./default-rendering.nix;
   fontconfig-custom-rendering = ./custom-rendering.nix;
   fontconfig-extra-config-files = ./extra-config-files.nix;
+  fontconfig-fonts = ./fonts.nix;
 
   fontconfig-old-default-configFile-toggle = ./old-default-configFile-toggle.nix;
 }

tests/modules/misc/fontconfig/fonts.nix

@@ -0,0 +1,33 @@
+{ config, pkgs, ... }:
+
+let
+  configFile = "home-files/.config/fontconfig/conf.d/10-hm-fonts.conf";
+in
+{
+  fonts.fontconfig.enable = true;
+
+  nmt.script = ''
+    assertFileExists ${configFile}
+    assertFileContent ${configFile} ${pkgs.writeText "fonts.conf" ''
+      <?xml version='1.0'?>
+
+      <!-- Generated by Home Manager. -->
+
+      <!DOCTYPE fontconfig SYSTEM 'urn:fontconfig:fonts.dtd'>
+      <fontconfig>
+      <description>Add fonts in the Nix user profile</description>
+
+      <include ignore_missing="yes">${config.home.path}/etc/fonts/conf.d</include>
+      <include ignore_missing="yes">${config.home.path}/etc/fonts/fonts.conf</include>
+
+      <dir>${config.home.path}/lib/X11/fonts</dir>
+      <dir>${config.home.path}/share/fonts</dir>
+      <dir>${config.home.profileDirectory}/lib/X11/fonts</dir>
+      <dir>${config.home.profileDirectory}/share/fonts</dir>
+
+      <cachedir>${config.home.path}/lib/fontconfig/cache</cachedir>
+
+      </fontconfig>
+    ''}
+  '';
+}