nixos/shadowsocks: add test without plugin

nixos/modules/services/networking/shadowsocks.nix

···
       description = "shadowsocks-libev Daemon";
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
-      path = [ pkgs.shadowsocks-libev cfg.plugin ] ++ optional (cfg.passwordFile != null) pkgs.jq;
+      path = [ pkgs.shadowsocks-libev ] ++ optional (cfg.plugin != null) cfg.plugin ++ optional (cfg.passwordFile != null) pkgs.jq;
       serviceConfig.PrivateTmp = true;
       script = ''
         ${optionalString (cfg.passwordFile != null) ''

nixos/tests/all-tests.nix

···
   sanoid = handleTest ./sanoid.nix {};
   sddm = handleTest ./sddm.nix {};
   service-runner = handleTest ./service-runner.nix {};
-  shadowsocks = handleTest ./shadowsocks.nix {};
+  shadowsocks = handleTest ./shadowsocks {};
   shattered-pixel-dungeon = handleTest ./shattered-pixel-dungeon.nix {};
   shiori = handleTest ./shiori.nix {};
   signal-desktop = handleTest ./signal-desktop.nix {};

nixos/tests/shadowsocks.nix nixos/tests/shadowsocks/common.nix

···
-import ./make-test-python.nix ({ pkgs, lib, ... }: {
-    name = "shadowsocks";
+{ name
+, plugin ? null
+, pluginOpts ? ""
+}:
+
+import ../make-test-python.nix ({ pkgs, lib, ... }: {
+    inherit name;
     meta = {
       maintainers = with lib.maintainers; [ hmenke ];
     };
···
           port = 8488;
           fastOpen = false;
           mode = "tcp_and_udp";
-          plugin = "${pkgs.shadowsocks-v2ray-plugin}/bin/v2ray-plugin";
-          pluginOpts = "server;host=nixos.org";
+        } // lib.optionalAttrs (plugin != null) {
+          inherit plugin;
+          pluginOpts = "server;${pluginOpts}";
         };
         services.nginx = {
           enable = true;
···
           description = "connect to shadowsocks";
           after = [ "network.target" ];
           wantedBy = [ "multi-user.target" ];
-          path = with pkgs; [
-            shadowsocks-libev
-            shadowsocks-v2ray-plugin
-          ];
+          path = with pkgs; [ shadowsocks-libev ];
           script = ''
             exec ss-local \
                 -s 192.168.0.1 \
···
                 -k 'pa$$w0rd' \
                 -m chacha20-ietf-poly1305 \
                 -a nobody \
-                --plugin "${pkgs.shadowsocks-v2ray-plugin}/bin/v2ray-plugin" \
-                --plugin-opts "host=nixos.org"
+                ${lib.optionalString (plugin != null) ''
+                  --plugin "${plugin}" --plugin-opts "${pluginOpts}"
+                ''}
           '';
         };
       };

nixos/tests/shadowsocks/default.nix

···
+{ system ? builtins.currentSystem
+, config ? { }
+, pkgs ? import ../../.. { inherit system config; }
+}:
+
+{
+  "basic" = import ./common.nix {
+    name = "basic";
+  };
+
+  "v2ray-plugin" = import ./common.nix {
+    name = "v2ray-plugin";
+    plugin = "${pkgs.shadowsocks-v2ray-plugin}/bin/v2ray-plugin";
+    pluginOpts = "host=nixos.org";
+  };
+}