systemd: name slice unit correctly

tests/modules/systemd/default.nix

@@ -2,5 +2,6 @@
   systemd-services = ./services.nix;
   systemd-services-disabled-for-root = ./services-disabled-for-root.nix;
   systemd-session-variables = ./session-variables.nix;
+  systemd-slices = ./slices.nix;
   systemd-timers = ./timers.nix;
 }

tests/modules/systemd/slices.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+{
+  config = {
+    systemd.user.slices.app-test = {
+      Unit = { Description = "Slice for a test app"; };
+
+      Slice = {
+        MemoryHigh = "30%";
+        MemoryMax = "40%";
+      };
+    };
+
+    nmt.script = ''
+      sliceFile=home-files/.config/systemd/user/app-test.slice
+      assertFileExists $sliceFile
+      assertFileContent $sliceFile ${
+        builtins.toFile "app-test-expected.conf" ''
+          [Slice]
+          MemoryHigh=30%
+          MemoryMax=40%
+
+          [Unit]
+          Description=Slice for a test app
+        ''
+      }
+    '';
+  };
+}