python.pkgs.pytest_3: keep older version

because not all test suites are compatible with 4 yet.

1 files changed, 6 insertions, 0 deletions

diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e00567e8020..30eba87155e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1500,6 +1500,12 @@ in {
     hypothesis = self.hypothesis.override { doCheck = false; };
   };
 
+  # Keep 3 because many test suites are not yet compatible with Pytest 4.
+  pytest_3 = callPackage ../development/python-modules/pytest/3.10.nix {
+    # hypothesis tests require pytest that causes dependency cycle
+    hypothesis = self.hypothesis.override { doCheck = false; };
+  };
+
   pytest-httpbin = callPackage ../development/python-modules/pytest-httpbin { };
 
   pytest-asyncio = callPackage ../development/python-modules/pytest-asyncio { };