python3Packages.misoc: Actually run tests.

pkgs/development/python-modules/misoc/default.nix

···
   migen,
 
   # tests
+  unittestCheckHook,
   numpy,
 }:
 
···
     migen
   ];
 
-  nativeCheckInputs = [ numpy ];
+  nativeCheckInputs = [
+    unittestCheckHook
+    numpy
+  ];
 
   pythonImportsCheck = [ "misoc" ];