systemd: add some basic tests

(cherry picked from commit 6ebf14143a)

tests/default.nix

@@ -27,8 +27,11 @@ import nmt {
     texlive-minimal = ./modules/programs/texlive-minimal.nix;
     xresources = ./modules/xresources.nix;
   }
-  // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux {
+  // pkgs.lib.optionalAttrs pkgs.stdenv.hostPlatform.isLinux (
+    {
       i3-keybindings = ./modules/services/window-managers/i3-keybindings.nix;
     }
+    // import ./modules/systemd
+  )
   // import ./modules/programs/ssh;
 }

tests/modules/systemd/default.nix

@@ -0,0 +1,4 @@
+{
+  systemd-services = ./services.nix;
+  systemd-timers = ./timers.nix;
+}

tests/modules/systemd/services-expected.conf

@@ -0,0 +1,5 @@
+[Service]
+ExecStart=/some/exec/start/command --with-arguments "%i"
+
+[Unit]
+Description=A basic test service

tests/modules/systemd/services.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    systemd.user.services."test-service@" = {
+      Unit = {
+        Description = "A basic test service";
+      };
+
+      Service = {
+        ExecStart = ''/some/exec/start/command --with-arguments "%i"'';
+      };
+    };
+
+    nmt.script = ''
+      local serviceFile=home-files/.config/systemd/user/test-service@.service
+      assertFileExists $serviceFile
+      assertFileContent $serviceFile ${./services-expected.conf}
+    '';
+  };
+}

tests/modules/systemd/timers-expected.conf

@@ -0,0 +1,8 @@
+[Install]
+WantedBy=timers.target
+
+[Timer]
+OnUnitActiveSec=1h 30m
+
+[Unit]
+Description=A basic test timer

tests/modules/systemd/timers.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    systemd.user.timers.test-timer = {
+      Unit = {
+        Description = "A basic test timer";
+      };
+
+      Timer = {
+        OnUnitActiveSec = "1h 30m";
+      };
+
+      Install = {
+        WantedBy = [ "timers.target" ];
+      };
+    };
+
+    nmt.script = ''
+      local unitDir=home-files/.config/systemd/user
+      local timerFile=$unitDir/test-timer.timer
+
+      assertFileExists $timerFile
+      assertFileContent $timerFile ${./timers-expected.conf}
+
+      assertFileExists $unitDir/timers.target.wants/test-timer.timer
+    '';
+  };
+}