home-assistant: limit tests to Linux

pkgs/servers/home-assistant/default.nix

@@ -1,4 +1,4 @@
-{ lib, fetchurl, fetchFromGitHub, fetchpatch, python3, protobuf3_6
+{ stdenv, lib, fetchurl, fetchFromGitHub, fetchpatch, python3, protobuf3_6
 
 # Look up dependencies of specified components in component-packages.nix
 , extraComponents ? [ ]
@@ -98,6 +98,9 @@ in with py.pkgs; buildPythonApplication rec {
     sqlalchemy aiohttp-cors hass-frontend pyotp pyqrcode ciso8601
   ] ++ componentBuildInputs ++ extraBuildInputs;
 
+  # upstream only tests on Linux, so do we.
+  doCheck = stdenv.isLinux;
+
   checkInputs = [
     asynctest pytest pytest-aiohttp requests-mock hass-nabucasa netdisco pydispatcher
   ];