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-rw-r--r--nixpkgs/pkgs/development/python-modules/nbval/default.nix6
1 files changed, 5 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/development/python-modules/nbval/default.nix b/nixpkgs/pkgs/development/python-modules/nbval/default.nix
index 198f139b1128..704bc21d7e1a 100644
--- a/nixpkgs/pkgs/development/python-modules/nbval/default.nix
+++ b/nixpkgs/pkgs/development/python-modules/nbval/default.nix
@@ -40,8 +40,12 @@ buildPythonPackage rec {
     six
   ];
 
-  # ignore impure tests
+  # Set HOME so that matplotlib doesn't try to use
+  # /homeless-shelter/.config/matplotlib, otherwise some of the tests fail for
+  # having an unexpected warning on stderr produced by matplotlib.
+  # Ignore impure tests.
   checkPhase = ''
+    export HOME=$(mktemp -d)
     pytest tests --ignore tests/test_timeouts.py
   '';