diff --git a/karma.conf.js b/karma.conf.js
index 083203b08..7e018cb16 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -21,7 +21,16 @@ var path = require('path');
 
 module.exports = function (config) {
   // This tox venv is setup in the post-install npm step
-  var toxPath = '.tox/py38/lib/python3.8/site-packages/';
+  var toxPath = path.resolve('./.tox/npm');
+  if (!toxPath) {
+      console.error('xStatic libraries not found, please run `tox -e npm`');
+      process.exit(1);
+    }
+    toxPath += '/lib/';
+    toxPath += fs.readdirSync(toxPath).find(function(directory) {
+      return directory.indexOf('python') === 0;
+    });
+    toxPath += '/site-packages/';
   var xstaticPath = toxPath + 'xstatic/pkg/';
 
   config.set({
diff --git a/tools/post_install.sh b/tools/post_install.sh
index d7478f3b4..4a321b9f0 100755
--- a/tools/post_install.sh
+++ b/tools/post_install.sh
@@ -10,4 +10,4 @@ then
 fi
 
 echo "Creating a tox env which will contain xStatic libraries, horizon, and openstack_dashboard"
-tox -epy38 --notest
+tox -enpm --notest
diff --git a/tox.ini b/tox.ini
index 7ac4e7fe3..b2ad11e55 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,6 @@
 [tox]
-envlist = py38,pep8
+envlist = py38, pep8, npm
 minversion = 2.0
-skipsdist = True
 ignore_basepython_conflict = True
 
 [testenv]
@@ -9,11 +8,12 @@ basepython = python3
 usedevelop = True
 setenv = VIRTUAL_ENV={envdir}
          DJANGO_SETTINGS_MODULE=muranodashboard.tests.settings
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
+passenv = http_proxy, HTTP_PROXY, https_proxy, HTTPS_PROXY, no_proxy, NO_PROXY
 deps = -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
        http://tarballs.openstack.org/heat-dashboard/heat-dashboard-master.tar.gz
+allowlist_externals = {toxinidir}/manage.py
 commands =
   {toxinidir}/manage.py test muranodashboard --settings=muranodashboard.tests.settings