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-rw-r--r--pkgs/servers/home-assistant/default.nix2
-rw-r--r--pkgs/servers/home-assistant/tests.nix4
2 files changed, 4 insertions, 2 deletions
diff --git a/pkgs/servers/home-assistant/default.nix b/pkgs/servers/home-assistant/default.nix
index ded617b35f6cf..b74947e8ab75c 100644
--- a/pkgs/servers/home-assistant/default.nix
+++ b/pkgs/servers/home-assistant/default.nix
@@ -293,8 +293,6 @@ in python.pkgs.buildPythonApplication rec {
   ];
 
   pytestFlagsArray = [
-    # parallelize test run
-    "--numprocesses $NIX_BUILD_CORES"
     # assign tests grouped by file to workers
     "--dist loadfile"
     # retry racy tests that end in "RuntimeError: Event loop is closed"
diff --git a/pkgs/servers/home-assistant/tests.nix b/pkgs/servers/home-assistant/tests.nix
index 58bb1670e5a01..00b2e7fbac07e 100644
--- a/pkgs/servers/home-assistant/tests.nix
+++ b/pkgs/servers/home-assistant/tests.nix
@@ -56,7 +56,11 @@ in lib.listToAttrs (map (component: lib.nameValuePair component (
     disabledTests = old.disabledTests ++ extraDisabledTests.${component} or [];
     disabledTestPaths = old.disabledTestPaths ++ extraDisabledTestPaths.${component} or [ ];
 
+    # components are more often racy than the core
+    dontUsePytestXdist = true;
+
     pytestFlagsArray = lib.remove "tests" old.pytestFlagsArray
+      ++ [ "--numprocesses=4" ]
       ++ extraPytestFlagsArray.${component} or [ ]
       ++ [ "tests/components/${component}" ];