diff --git a/README.rst b/README.rst
index f895d74..590bb05 100644
--- a/README.rst
+++ b/README.rst
@@ -65,7 +65,11 @@ If you're using OS X, be sure to use the officially distributed Python 3.4 insta
 Running
 #######
 
-Tox will run unit and integration tests in both Python environments using a temporarily created virtualenv. For integration tests to work, you need a Marathon instance running on localhost.
+Tox will run unit and integration tests in both Python environments using a temporarily created virtualenv
+
+You should ensure `DCOS_CONFIG` is set and that the config file points to the Marathon instance you want to use for integration tests. If you're happy to use the default test configuration which assumes there is a Marathon instance running on localhost, set `DCOS_CONFIG` as follows::
+
+    export DCOS_CONFIG=$(pwd)/tests/data/Dcos.toml
 
 There are two ways to run tests, you can either use the virtualenv created by :code:`make env` above::
 
diff --git a/integrations/cli/test_config.py b/integrations/cli/test_config.py
index 49349ab..27bf19b 100644
--- a/integrations/cli/test_config.py
+++ b/integrations/cli/test_config.py
@@ -1,6 +1,18 @@
+import os
+import pytest
+
 from common import exec_command
 
 
+@pytest.fixture
+def env():
+    return {
+        'PATH': os.environ['PATH'],
+        'DCOS_PATH': os.environ['DCOS_PATH'],
+        'DCOS_CONFIG': os.path.join("tests", "data", "Dcos.toml")
+    }
+
+
 def test_help():
     returncode, stdout, stderr = exec_command(['dcos', 'config', '--help'])
 
@@ -35,9 +47,9 @@ def test_version():
     assert stderr == b''
 
 
-def test_list_property():
-    returncode, stdout, stderr = exec_command(['dcos', 'config', '--list'])
-
+def test_list_property(env):
+    returncode, stdout, stderr = exec_command(['dcos', 'config', '--list'],
+                                              env)
     assert returncode == 0
     assert stdout == b"""marathon.host=localhost
 marathon.port=8080
@@ -48,60 +60,62 @@ package.sources=['git://github.com/mesosphere/universe.git', \
     assert stderr == b''
 
 
-def test_get_existing_property():
-    _get_value('marathon.host', 'localhost')
+def test_get_existing_property(env):
+    _get_value('marathon.host', 'localhost', env)
 
 
-def test_get_missing_proerty():
-    _get_missing_value('missing.property')
+def test_get_missing_proerty(env):
+    _get_missing_value('missing.property', env)
 
 
-def test_set_existing_property():
-    _set_value('marathon.host', 'newhost')
-    _get_value('marathon.host', 'newhost')
-    _set_value('marathon.host', 'localhost')
+def test_set_existing_property(env):
+    _set_value('marathon.host', 'newhost', env)
+    _get_value('marathon.host', 'newhost', env)
+    _set_value('marathon.host', 'localhost', env)
 
 
-def test_unset_property():
-    _unset_value('marathon.host')
-    _get_missing_value('marathon.host')
-    _set_value('marathon.host', 'localhost')
+def test_unset_property(env):
+    _unset_value('marathon.host', env)
+    _get_missing_value('marathon.host', env)
+    _set_value('marathon.host', 'localhost', env)
 
 
-def test_set_missing_property():
-    _set_value('path.to.value', 'cool new value')
-    _get_value('path.to.value', 'cool new value')
-    _unset_value('path.to.value')
+def test_set_missing_property(env):
+    _set_value('path.to.value', 'cool new value', env)
+    _get_value('path.to.value', 'cool new value', env)
+    _unset_value('path.to.value', env)
 
 
-def _set_value(key, value):
-    returncode, stdout, stderr = exec_command(['dcos', 'config', key, value])
-
+def _set_value(key, value, env):
+    returncode, stdout, stderr = exec_command(['dcos', 'config', key, value],
+                                              env)
     assert returncode == 0
     assert stdout == b''
     assert stderr == b''
 
 
-def _get_value(key, value):
-    returncode, stdout, stderr = exec_command(['dcos', 'config', key])
-
+def _get_value(key, value, env):
+    returncode, stdout, stderr = exec_command(['dcos', 'config', key],
+                                              env)
     assert returncode == 0
     assert stdout == '{}\n'.format(value).encode('utf-8')
     assert stderr == b''
 
 
-def _unset_value(key):
-    returncode, stdout, stderr = exec_command(
-        ['dcos', 'config', '--unset', key])
-
+def _unset_value(key, env):
+    returncode, stdout, stderr = exec_command(['dcos',
+                                               'config',
+                                               '--unset',
+                                               key],
+                                              env)
     assert returncode == 0
     assert stdout == b''
     assert stderr == b''
 
 
-def _get_missing_value(key):
-    returncode, stdout, stderr = exec_command(['dcos', 'config', key])
-
+def _get_missing_value(key, env):
+    returncode, stdout, stderr = exec_command(['dcos', 'config', key],
+                                              env)
     assert returncode == 1
     assert stdout == b''
     assert stderr == b''
diff --git a/tox.ini b/tox.ini
index 695e0bb..0489ad6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,7 +8,6 @@ deps =
 
 setenv =
   DCOS_PATH={envdir}
-  DCOS_CONFIG={toxinidir}/tests/data/Dcos.toml
 
 [testenv:syntax]
 deps =