nixos/tests/speechd: init

This test ensures that the speechd module evals correctly behind its
`mkIf` guard, and verifies that configuration is picked up correctly.

It unfortunately does not test integration with other systems like
pipewire, but the test is better than nothing in it's current state.

nixos/tests/all-tests.nix

@@ -1717,6 +1717,7 @@ in
   sonic-server = runTest ./sonic-server.nix;
   spacecookie = runTest ./spacecookie.nix;
   spark = handleTestOn [ "x86_64-linux" "aarch64-linux" ] ./spark { };
+  speechd = runTest ./speechd.nix;
   speedtest-tracker = runTest ./speedtest-tracker.nix;
   spiped = runTest ./spiped.nix;
   spire = runTest ./spire.nix;

nixos/tests/speechd.nix

@@ -0,0 +1,49 @@
+{ lib, ... }:
+{
+  name = "speechd";
+  meta.maintainers = [ lib.maintainers.h7x4 ];
+
+  nodes.machine =
+    { pkgs, ... }:
+    {
+      imports = [ ./common/user-account.nix ];
+
+      environment.systemPackages = [ pkgs.speechd ];
+
+      # Without a real sound card, libao (speech-dispatcher's audio backend)
+      # fails to open any device. libao's built-in "null" driver always succeeds.
+      environment.etc."libao.conf".text = ''
+        default_driver=null
+      '';
+
+      services.speechd = {
+        enable = true;
+        config = ''
+          AddModule "testmodule" "sd_generic" "testmodule.conf"
+          DefaultModule "testmodule"
+        '';
+        modules.testmodule = ''
+          AddVoice "en" "male1" "testmodule_voice"
+          GenericLanguage "en" "en"
+          GenericExecuteSynth "echo \'$DATA\' >> /tmp/speechd-spoken.txt"
+        '';
+      };
+    };
+
+  testScript =
+    { nodes, ... }:
+    let
+      user = nodes.machine.users.users.alice;
+      uid = toString user.uid;
+      aliceRun = command: "su - ${user.name} -c 'XDG_RUNTIME_DIR=/run/user/${uid} ${command}'";
+    in
+    ''
+      machine.wait_for_unit("multi-user.target")
+      machine.succeed("loginctl enable-linger ${user.name}")
+      machine.wait_for_unit("user@${uid}.service")
+      machine.wait_for_unit("speech-dispatcher.socket", "${user.name}")
+
+      machine.succeed("${aliceRun "spd-say 'hello'"}")
+      machine.wait_until_succeeds("grep -q 'hello' /tmp/speechd-spoken.txt")
+    '';
+}

pkgs/by-name/sp/speechd/package.nix

@@ -33,6 +33,7 @@
   withPico ? true,
   picotts,
   libsOnly ? false,
+  nixosTests,
 }:
 
 let
@@ -152,6 +153,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   enableParallelBuilding = true;
 
+  passthru.tests.nixos = nixosTests.speechd;
+
   meta = {
     description =
       "Common interface to speech synthesis" + lib.optionalString libsOnly " - client libraries only";