home-assistant: add NixOS test

nixos/release.nix

@@ -267,6 +267,7 @@ in rec {
   tests.graphite = callTest tests/graphite.nix {};
   tests.hardened = callTest tests/hardened.nix { };
   tests.hibernate = callTest tests/hibernate.nix {};
+  tests.home-assistant = callTest tests/home-assistant.nix { };
   tests.hound = callTest tests/hound.nix {};
   tests.i3wm = callTest tests/i3wm.nix {};
   tests.initrd-network-ssh = callTest tests/initrd-network-ssh {};

nixos/tests/home-assistant.nix

@@ -0,0 +1,41 @@
+import ./make-test.nix ({ pkgs, ... }:
+
+let
+  configDir = "/var/lib/foobar";
+
+in {
+  name = "home-assistant";
+
+  nodes = {
+    hass =
+      { config, pkgs, ... }:
+      {
+        services.home-assistant = {
+          inherit configDir;
+          enable = true;
+          config = {
+            homeassistant = {
+              name = "Home";
+              time_zone = "UTC";
+            };
+            frontend = { };
+            http = { };
+          };
+        };
+      };
+    };
+
+  testScript = ''
+    startAll;
+    $hass->waitForUnit("home-assistant.service");
+    
+    # Since config is specified using a Nix attribute set,
+    # configuration.yaml is a link to the Nix store
+    $hass->succeed("test -L ${configDir}/configuration.yaml");
+
+    # Check that Home Assistant's web interface and API can be reached
+    $hass->waitForOpenPort(8123);
+    $hass->succeed("curl --fail http://localhost:8123/states");
+    $hass->succeed("curl --fail http://localhost:8123/api/ | grep 'API running'");
+  '';
+})