nixos/tests/home-assistant: drop mqtt tests

With Home Assistant 2022.3.0 the MQTT configuration cannot be done
declaratively anymore, so this test scenario has been rendered moot.

nixos/tests/home-assistant.nix

@@ -2,8 +2,6 @@ import ./make-test-python.nix ({ pkgs, lib, ... }:
 
 let
   configDir = "/var/lib/foobar";
-  mqttUsername = "homeassistant";
-  mqttPassword = "secret";
 in {
   name = "home-assistant";
   meta.maintainers = lib.teams.home-assistant.members;
@@ -11,18 +9,6 @@ in {
   nodes.hass = { pkgs, ... }: {
     environment.systemPackages = with pkgs; [ mosquitto ];
 
-    services.mosquitto = {
-      enable = true;
-      listeners = [ {
-        users = {
-          "${mqttUsername}" = {
-            acl = [ "readwrite #" ];
-            password = mqttPassword;
-          };
-        };
-      } ];
-    };
-
     services.postgresql = {
       enable = true;
       ensureDatabases = [ "hass" ];
@@ -76,23 +62,6 @@ in {
         # https://www.home-assistant.io/integrations/frontend/
         frontend = {};
 
-        # configure an mqtt broker connection
-        # https://www.home-assistant.io/integrations/mqtt
-        mqtt = {
-          broker = "127.0.0.1";
-          username = mqttUsername;
-          password = mqttPassword;
-        };
-
-        # create a mqtt sensor that syncs state with its mqtt topic
-        # https://www.home-assistant.io/integrations/sensor.mqtt/
-        binary_sensor = [ {
-          platform = "mqtt";
-          state_topic = "home-assistant/test";
-          payload_on = "let_there_be_light";
-          payload_off = "off";
-        } ];
-
         # set up a wake-on-lan switch to test capset capability required
         # for the ping suid wrapper
         # https://www.home-assistant.io/integrations/wake_on_lan/
@@ -109,11 +78,9 @@ in {
           listen_port = 80;
         };
 
-        # show mqtt interaction in the log
         # https://www.home-assistant.io/integrations/logger/
         logger = {
           default = "info";
-          logs."homeassistant.components.mqtt" = "debug";
         };
       };
 
@@ -167,12 +134,6 @@ in {
         hass.wait_for_open_port(8123)
         hass.succeed("curl --fail http://localhost:8123/lovelace")
 
-    with subtest("Toggle a binary sensor using MQTT"):
-        hass.wait_for_open_port(1883)
-        hass.succeed(
-            "mosquitto_pub -V mqttv5 -t home-assistant/test -u ${mqttUsername} -P '${mqttPassword}' -m let_there_be_light"
-        )
-
     with subtest("Check that capabilities are passed for emulated_hue to bind to port 80"):
         hass.wait_for_open_port(80)
         hass.succeed("curl --fail http://localhost:80/description.xml")
@@ -188,10 +149,6 @@ in {
     with subtest("Check that no errors were logged"):
         assert "ERROR" not in output_log
 
-    # example line: 2020-06-20 10:01:32 DEBUG (MainThread) [homeassistant.components.mqtt] Received message on home-assistant/test: b'let_there_be_light'
-    with subtest("Check we received the mosquitto message"):
-        assert "let_there_be_light" in output_log
-
     with subtest("Check systemd unit hardening"):
         hass.log(hass.succeed("systemctl cat home-assistant.service"))
         hass.log(hass.succeed("systemd-analyze security home-assistant.service"))