pythonPackages.env: make compatible with click 8

Also clean up inputs and define checkPhase.

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

@@ -1,5 +1,12 @@
-{ lib, buildPythonPackage, fetchPypi
-, mock, jinja2, click, terminaltables
+{ lib
+, buildPythonPackage
+, fetchPypi
+, fetchpatch
+, click
+, jinja2
+, terminaltables
+, mock
+, nose
 }:
 
 buildPythonPackage rec {
@@ -11,7 +18,32 @@ buildPythonPackage rec {
     sha256 = "ccf5cd85ddb8ed335e39ed8a22e0d23658f5a6d7da430f225e6f750c6f50ae42";
   };
 
-  checkInputs = [ mock jinja2 click terminaltables ];
+  patches = [
+    # https://github.com/capless/envs/pull/19
+    (fetchpatch {
+      url = "https://github.com/capless/envs/commit/6947043fa9120a7b17094fd43ee0e1edf808f42b.patch";
+      sha256 = "0zswg8kp2g922mkc7x34ps37qli1d1mjwna2jfrbnsq2fg4mk818";
+    })
+  ];
+
+  propagatedBuildInputs = [
+    click
+    jinja2
+    terminaltables
+  ];
+
+  checkInputs = [
+    mock
+    nose
+  ];
+
+  checkPhase = ''
+    runHook preCheck
+
+    nosetests --with-isolation
+
+    runHook postCheck
+  '';
 
   meta = with lib; {
     description = "Easy access to environment variables from Python";