diff --git a/nixos/packages/etesync-dav/default.nix b/nixos/packages/etesync-dav/default.nix
index bb3dc14d..209785f0 100644
--- a/nixos/packages/etesync-dav/default.nix
+++ b/nixos/packages/etesync-dav/default.nix
@@ -1,10 +1,12 @@
 with import <nixpkgs> {};
 let
-    pyscrypt = python37.pkgs.buildPythonPackage {
-      name = "pyscrypt-1.6.2";
-      src = fetchurl {
-         url = "https://files.pythonhosted.org/packages/c6/56/51603b5714d221b784e4cbc2790b1215b3fb108e4d308a0bd52e4c3ce532/pyscrypt-1.6.2.tar.gz";
-         sha256 = "bafdd195f10f7c7395f0133bad09746a68e0e6b66da202c9bdb6b1eb4abba5e9"; };
+    pyscrypt = python37.pkgs.buildPythonPackage rec {
+      pname = "pyscrypt";
+      version = "1.6.2";
+      src = pythonPackages.fetchPypi {
+        inherit pname version;
+        sha256 = "bafdd195f10f7c7395f0133bad09746a68e0e6b66da202c9bdb6b1eb4abba5e9";
+      };
       doCheck = false;
       meta = with stdenv.lib; {
         homepage = "https://github.com/ricmoo/pyscrypt";
@@ -12,25 +14,31 @@ let
         description = "Pure-Python Implementation of the scrypt password-based key derivation function and scrypt file format library";
       };
     };
-    orderedmultidict = python37.pkgs.buildPythonPackage {
-      name = "orderedmultidict-1.0";
-      src = pkgs.fetchurl {
-        url = "https://files.pythonhosted.org/packages/19/67/2e1462785b84f40812e61d349f77063939f8f220345b0dfc26c4e3e07af0/orderedmultidict-1.0.tar.gz";
-        sha256 = "b89895ba6438038d0bdf88020ceff876cf3eae0d5c66a69b526fab31125db2c5"; };
-      doCheck = false;
+
+    orderedmultidict = python37.pkgs.buildPythonPackage rec {
+      pname = "orderedmultidict";
+      version = "1.0";
+      src = pythonPackages.fetchPypi {
+        inherit pname version;
+        sha256 = "b89895ba6438038d0bdf88020ceff876cf3eae0d5c66a69b526fab31125db2c5";
+      };
+      checkInputs = [ python37Packages.pycodestyle ];
       propagatedBuildInputs = [ python37Packages.six ];
       meta = with pkgs.stdenv.lib; {
         homepage = "https://github.com/gruns/orderedmultidict";
-        license = "License :: Freely Distributable";
+        license = licenses.unlicense;
         description = "Ordered Multivalue Dictionary - omdict.";
       };
     };
-    furl = python37.pkgs.buildPythonPackage {
-      name = "furl-2.0.0";
-      src = pkgs.fetchurl {
-        url = "https://files.pythonhosted.org/packages/93/70/e266a29c3c1c9ec94d7fcb3232e0d77bfa04c281f44a9edeb9946a256d91/furl-2.0.0.tar.gz";
-        sha256 = "fdcaedc1fb19a63d7d875b0105b0a5b496dd0989330d454a42bcb401fa5454ec"; };
-      doCheck = false;
+
+    furl = python37.pkgs.buildPythonPackage rec {
+      pname = "furl";
+      version = "2.0.0";
+      src = pythonPackages.fetchPypi {
+        inherit pname version;
+        sha256 = "fdcaedc1fb19a63d7d875b0105b0a5b496dd0989330d454a42bcb401fa5454ec";
+      };
+      checkInputs = [ python37Packages.flake8 ];
       propagatedBuildInputs = [ orderedmultidict python37Packages.six ];
       meta = with pkgs.stdenv.lib; {
         homepage = "https://github.com/gruns/furl";
@@ -38,6 +46,7 @@ let
         description = "URL manipulation made simple.";
       };
     };
+
     etesync = python37.pkgs.buildPythonPackage rec {
         pname = "etesync";
         version = "0.8.1";
@@ -45,7 +54,7 @@ let
           inherit pname version;
           sha256 = "007zsdn0zv0f80wpyf8fzl446wmv7jr8a0pdp4wj1y61b14f4q0p";
         };
-        doCheck = false;
+        checkInputs = [ python37Packages.pytest ];
         meta = with pkgs.stdenv.lib; {
           homepage = "https://github.com/etesync/pyetesync";
           license = licenses.lgpl3;
@@ -77,13 +86,20 @@ let
           ];
     };
 
-    Radicale = python37.pkgs.buildPythonPackage rec {
-      name = "Radicale-2.1.11";
-      src = pkgs.fetchurl {
-        url = "https://files.pythonhosted.org/packages/be/50/b5094950d53f11e56eb17932469e0e313275da0c5e633590c939863f3c37/Radicale-2.1.11.tar.gz";
+    radicale = python37.pkgs.buildPythonPackage rec {
+      pname = "Radicale";
+      version = "2.1.11";
+      src = pythonPackages.fetchPypi {
+        inherit pname version;
         sha256 = "02273fcc6ae10e0f74aa12652e24d0001eec8dbf467d54ddb4dfcc2af7d7a5db";
       };
       doCheck = false;
+      checkInputs = [
+        python37Packages.pytestrunner
+        python37Packages.pytest-isort
+        python37Packages.pytest-flake8
+        python37Packages.pytestcov
+      ];
       propagatedBuildInputs = [ python37Packages.dateutil python37Packages.vobject ];
       meta = with pkgs.stdenv.lib; {
         homepage = "http://www.radicale.org/";
@@ -93,21 +109,27 @@ let
     };
 
     radicale-storage-etesync = python37.pkgs.buildPythonPackage rec {
-      name = "radicale-storage-etesync-0.7.0";
-      src = pkgs.fetchurl {
-         url = "https://files.pythonhosted.org/packages/55/77/c9f3f9a86e2e31204cb5f0f1fbf24745ac86f8c739618db41e52390c73c2/radicale_storage_etesync-0.7.0.tar.gz";
-         sha256 = "0542fbcbd245b723e78d4e8ff2e211f052408897eb515147a86351a8654208ef";
+      pname = "radicale_storage_etesync";
+      version = "0.7.0";
+      src = pythonPackages.fetchPypi {
+        inherit pname version;
+        sha256 = "1vq889jshlb3m13m2lgbjy440lph27ig53sfipkj7ds5sb5znhh5";
       };
-      doCheck = false;
-      propagatedBuildInputs = [ etesync Radicale pyscrypt orderedmultidict furl
-        python37Packages.coverage python37Packages.pyasn1 python37Packages.appdirs
-        python37Packages.vobject python37Packages.py python37Packages.cffi
-        python37Packages.pyparsing python37Packages.requests python37Packages.peewee
+      propagatedBuildInputs = [ etesync radicale pyscrypt orderedmultidict furl
+        python37Packages.coverage
+        python37Packages.pyasn1
+        python37Packages.appdirs
+        python37Packages.vobject
+        python37Packages.py
+        python37Packages.cffi
+        python37Packages.pyparsing
+        python37Packages.requests
+        python37Packages.peewee
       ];
       meta = with pkgs.stdenv.lib; {
         homepage = "https://github.com/etesync/radicale_storage_etesync";
-        license = "GPL";
-        description = "An EteSync storage plugin for Radicale";
+        license = licenses.gpl3;
+        description = "An EteSync storage plugin for radicale";
       };
     };
 
@@ -141,7 +163,7 @@ python37.pkgs.buildPythonPackage rec {
       python37Packages.six
       python37Packages.urllib3
       python37Packages.vobject
-      Radicale
+      radicale
       furl
       orderedmultidict
       pyscrypt