diff --git a/nipype/__init__.py b/nipype/__init__.py
index a15b2721bd..ad961e7df4 100644
--- a/nipype/__init__.py
+++ b/nipype/__init__.py
@@ -25,19 +25,19 @@
 
 
 class NipypeTester(object):
-    def __call__(self, doctests=True):
+    def __call__(self, doctests=True, parallel=True):
         try:
             import pytest
         except:
             raise RuntimeError(
                 'py.test not installed, run: pip install pytest')
-        params = {'args': []}
-        if doctests:
-            params['args'].append('--doctest-modules')
-        nipype_path = os.path.dirname(__file__)
-        params['args'].extend(
-            ['-x', '--ignore={}/external'.format(nipype_path), nipype_path])
-        pytest.main(**params)
+        args = []
+        if not doctests:
+            args.extend(['-p', 'no:doctest'])
+        if not parallel:
+            args.append('-n0')
+        args.append(os.path.dirname(__file__))
+        pytest.main(args=args)
 
 
 test = NipypeTester()
diff --git a/nipype/algorithms/confounds.py b/nipype/algorithms/confounds.py
index 8961433c14..bc1028beb2 100644
--- a/nipype/algorithms/confounds.py
+++ b/nipype/algorithms/confounds.py
@@ -3,13 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 '''
 Algorithms to compute confounds in :abbr:`fMRI (functional MRI)`
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 '''
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/algorithms/mesh.py b/nipype/algorithms/mesh.py
index b37826530d..a0830935fe 100644
--- a/nipype/algorithms/mesh.py
+++ b/nipype/algorithms/mesh.py
@@ -3,14 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """
 Miscellaneous algorithms for 2D contours and 3D triangularized meshes handling
-
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath( __file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/algorithms/metrics.py b/nipype/algorithms/metrics.py
index 002b2a8216..f95e80edd0 100644
--- a/nipype/algorithms/metrics.py
+++ b/nipype/algorithms/metrics.py
@@ -4,13 +4,6 @@
 '''
 Image assessment algorithms. Typical overlap and error computation
 measures to evaluate results from other processing units.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 '''
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/algorithms/misc.py b/nipype/algorithms/misc.py
index 87b1fae400..7b9d055181 100644
--- a/nipype/algorithms/misc.py
+++ b/nipype/algorithms/misc.py
@@ -3,13 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 '''
 Miscellaneous algorithms
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 '''
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/algorithms/modelgen.py b/nipype/algorithms/modelgen.py
index 289ebc8388..6d272d8781 100644
--- a/nipype/algorithms/modelgen.py
+++ b/nipype/algorithms/modelgen.py
@@ -10,13 +10,6 @@
 These functions include:
 
   * SpecifyModel: allows specification of sparse and non-sparse models
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/algorithms/rapidart.py b/nipype/algorithms/rapidart.py
index ddf8de8992..c68276b828 100644
--- a/nipype/algorithms/rapidart.py
+++ b/nipype/algorithms/rapidart.py
@@ -11,12 +11,6 @@
 
   * StimulusCorrelation: determines correlation between stimuli
     schedule and movement/intensity parameters
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/caching/memory.py b/nipype/caching/memory.py
index 828feff75b..9fcf694d4b 100644
--- a/nipype/caching/memory.py
+++ b/nipype/caching/memory.py
@@ -2,12 +2,6 @@
 """
 Using nipype with persistence and lazy recomputation but without explicit
 name-steps pipeline: getting back scope in command-line based programming.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/conftest.py b/nipype/conftest.py
index ada8e08fb9..9e646a2a4f 100644
--- a/nipype/conftest.py
+++ b/nipype/conftest.py
@@ -2,12 +2,20 @@
 import numpy
 import os
 
+DATADIR = os.path.realpath(
+    os.path.join(os.path.dirname(__file__), 'testing/data'))
+
 
 @pytest.fixture(autouse=True)
 def add_np(doctest_namespace):
     doctest_namespace['np'] = numpy
     doctest_namespace['os'] = os
 
-    filepath = os.path.dirname(os.path.realpath(__file__))
-    datadir = os.path.realpath(os.path.join(filepath, 'testing/data'))
-    doctest_namespace["datadir"] = datadir
+    doctest_namespace["datadir"] = DATADIR
+
+
+@pytest.fixture(autouse=True)
+def in_testing(request):
+    # This seems to be a reliable way to distinguish tests from doctests
+    if request.function is None:
+        os.chdir(DATADIR)
diff --git a/nipype/info.py b/nipype/info.py
index 7cee71d6bd..a44ed823cc 100644
--- a/nipype/info.py
+++ b/nipype/info.py
@@ -153,7 +153,7 @@ def get_nipype_gitversion():
 if sys.version_info <= (3, 4):
     REQUIRES.append('configparser')
 
-TESTS_REQUIRES = ['pytest-cov', 'codecov']
+TESTS_REQUIRES = ['pytest-cov', 'codecov', 'pytest-xdist', 'pytest-env']
 
 EXTRA_REQUIRES = {
     'doc': ['Sphinx>=1.4', 'numpydoc', 'matplotlib', 'pydotplus', 'pydot>=1.2.3'],
diff --git a/nipype/interfaces/afni/model.py b/nipype/interfaces/afni/model.py
index 38ddf09520..2cccdfe869 100644
--- a/nipype/interfaces/afni/model.py
+++ b/nipype/interfaces/afni/model.py
@@ -6,11 +6,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/afni/preprocess.py b/nipype/interfaces/afni/preprocess.py
index 666f4b7be1..13a065c27c 100644
--- a/nipype/interfaces/afni/preprocess.py
+++ b/nipype/interfaces/afni/preprocess.py
@@ -2,12 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """AFNI preprocessing interfaces
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/afni/svm.py b/nipype/interfaces/afni/svm.py
index 2e6c53ce53..d465c1caaa 100644
--- a/nipype/interfaces/afni/svm.py
+++ b/nipype/interfaces/afni/svm.py
@@ -2,12 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft = python sts = 4 ts = 4 sw = 4 et:
 """Afni svm interfaces
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/afni/utils.py b/nipype/interfaces/afni/utils.py
index 1bd818c11d..6cc187a973 100644
--- a/nipype/interfaces/afni/utils.py
+++ b/nipype/interfaces/afni/utils.py
@@ -6,11 +6,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/ants/legacy.py b/nipype/interfaces/ants/legacy.py
index 9ca5844426..40f2def728 100644
--- a/nipype/interfaces/ants/legacy.py
+++ b/nipype/interfaces/ants/legacy.py
@@ -4,12 +4,6 @@
 #        of the antsApplyTransform program.  This implementation is here
 #        for backwards compatibility.
 """ANTS Apply Transforms interface
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 
 from builtins import range
diff --git a/nipype/interfaces/ants/registration.py b/nipype/interfaces/ants/registration.py
index bcc1d94b89..4fa9d0e12f 100644
--- a/nipype/interfaces/ants/registration.py
+++ b/nipype/interfaces/ants/registration.py
@@ -1,12 +1,6 @@
 # -*- coding: utf-8 -*-
 """The ants module provides basic functions for interfacing with ants
    functions.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/ants/resampling.py b/nipype/interfaces/ants/resampling.py
index a3f5723ba8..addbb7232e 100644
--- a/nipype/interfaces/ants/resampling.py
+++ b/nipype/interfaces/ants/resampling.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 """ANTS Apply Transforms interface
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/ants/segmentation.py b/nipype/interfaces/ants/segmentation.py
index b82db2e401..b3821c1425 100644
--- a/nipype/interfaces/ants/segmentation.py
+++ b/nipype/interfaces/ants/segmentation.py
@@ -1,12 +1,5 @@
 # -*- coding: utf-8 -*-
 """The ants module provides basic functions for interfacing with ants functions.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/ants/utils.py b/nipype/interfaces/ants/utils.py
index 43a3b4b98c..1813951175 100644
--- a/nipype/interfaces/ants/utils.py
+++ b/nipype/interfaces/ants/utils.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 """ANTS Apply Transforms interface
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/ants/visualization.py b/nipype/interfaces/ants/visualization.py
index 02e91b9321..21186931ce 100644
--- a/nipype/interfaces/ants/visualization.py
+++ b/nipype/interfaces/ants/visualization.py
@@ -1,10 +1,5 @@
 # -*- coding: utf-8 -*-
 """The ants visualisation module provides basic functions based on ITK.
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/bru2nii.py b/nipype/interfaces/bru2nii.py
index 550605d071..c1c1484d38 100644
--- a/nipype/interfaces/bru2nii.py
+++ b/nipype/interfaces/bru2nii.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 """The bru2nii module provides basic functions for dicom conversion
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/c3.py b/nipype/interfaces/c3.py
index f4778e7d93..115804cc3f 100644
--- a/nipype/interfaces/c3.py
+++ b/nipype/interfaces/c3.py
@@ -1,12 +1,6 @@
 # -*- coding: utf-8 -*-
 """The ants module provides basic functions for interfacing with ants
    functions.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/camino/calib.py b/nipype/interfaces/camino/calib.py
index e1a4ac32b5..1921f62651 100644
--- a/nipype/interfaces/camino/calib.py
+++ b/nipype/interfaces/camino/calib.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/camino/connectivity.py b/nipype/interfaces/camino/connectivity.py
index 39e13e46c1..97e400e0f5 100644
--- a/nipype/interfaces/camino/connectivity.py
+++ b/nipype/interfaces/camino/connectivity.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 import os
diff --git a/nipype/interfaces/camino/convert.py b/nipype/interfaces/camino/convert.py
index 3091efd348..ee2ae2eb82 100644
--- a/nipype/interfaces/camino/convert.py
+++ b/nipype/interfaces/camino/convert.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/camino/dti.py b/nipype/interfaces/camino/dti.py
index a3b0f74c48..b32b9dc528 100644
--- a/nipype/interfaces/camino/dti.py
+++ b/nipype/interfaces/camino/dti.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/camino/odf.py b/nipype/interfaces/camino/odf.py
index ccc5f2e277..6fea6fdcfd 100644
--- a/nipype/interfaces/camino/odf.py
+++ b/nipype/interfaces/camino/odf.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/camino/utils.py b/nipype/interfaces/camino/utils.py
index 1146927dc5..57fcd58d9a 100644
--- a/nipype/interfaces/camino/utils.py
+++ b/nipype/interfaces/camino/utils.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 import os
diff --git a/nipype/interfaces/camino2trackvis/convert.py b/nipype/interfaces/camino2trackvis/convert.py
index fd20442438..573ddffe2d 100644
--- a/nipype/interfaces/camino2trackvis/convert.py
+++ b/nipype/interfaces/camino2trackvis/convert.py
@@ -1,13 +1,6 @@
 # -*- coding: utf-8 -*-
 """
 Provides interfaces to various commands provided by Camino-Trackvis
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/cmtk/cmtk.py b/nipype/interfaces/cmtk/cmtk.py
index c7ca43cd4e..a8352a1b40 100644
--- a/nipype/interfaces/cmtk/cmtk.py
+++ b/nipype/interfaces/cmtk/cmtk.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from builtins import range, open
diff --git a/nipype/interfaces/cmtk/convert.py b/nipype/interfaces/cmtk/convert.py
index fc2dd98f28..793b92bd4b 100644
--- a/nipype/interfaces/cmtk/convert.py
+++ b/nipype/interfaces/cmtk/convert.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/cmtk/nx.py b/nipype/interfaces/cmtk/nx.py
index 1072188cbc..7316d555b1 100644
--- a/nipype/interfaces/cmtk/nx.py
+++ b/nipype/interfaces/cmtk/nx.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from builtins import str, open, range
diff --git a/nipype/interfaces/cmtk/parcellation.py b/nipype/interfaces/cmtk/parcellation.py
index 272fd22df9..824d653027 100644
--- a/nipype/interfaces/cmtk/parcellation.py
+++ b/nipype/interfaces/cmtk/parcellation.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from builtins import range
diff --git a/nipype/interfaces/dcm2nii.py b/nipype/interfaces/dcm2nii.py
index f4e8065b36..12aeb0acd6 100644
--- a/nipype/interfaces/dcm2nii.py
+++ b/nipype/interfaces/dcm2nii.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 """The dcm2nii module provides basic functions for dicom conversion
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/dcmstack.py b/nipype/interfaces/dcmstack.py
index 80a26365f1..626cabe6cf 100644
--- a/nipype/interfaces/dcmstack.py
+++ b/nipype/interfaces/dcmstack.py
@@ -1,12 +1,5 @@
 # -*- coding: utf-8 -*-
 """Provides interfaces to various commands provided by dcmstack
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/diffusion_toolkit/dti.py b/nipype/interfaces/diffusion_toolkit/dti.py
index 436b8cd027..570ae55df5 100644
--- a/nipype/interfaces/diffusion_toolkit/dti.py
+++ b/nipype/interfaces/diffusion_toolkit/dti.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various commands provided by diffusion toolkit
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/diffusion_toolkit/odf.py b/nipype/interfaces/diffusion_toolkit/odf.py
index c289adeb01..cf4eb683a2 100644
--- a/nipype/interfaces/diffusion_toolkit/odf.py
+++ b/nipype/interfaces/diffusion_toolkit/odf.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various commands provided by diffusion toolkit
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/diffusion_toolkit/postproc.py b/nipype/interfaces/diffusion_toolkit/postproc.py
index 3536cc2643..20aaeea927 100644
--- a/nipype/interfaces/diffusion_toolkit/postproc.py
+++ b/nipype/interfaces/diffusion_toolkit/postproc.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various commands provided by diffusion toolkit
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/dipy/anisotropic_power.py b/nipype/interfaces/dipy/anisotropic_power.py
index 29b81d1ebb..5142b828ba 100644
--- a/nipype/interfaces/dipy/anisotropic_power.py
+++ b/nipype/interfaces/dipy/anisotropic_power.py
@@ -1,11 +1,4 @@
 # -*- coding: utf-8 -*-
-"""Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-"""
-
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/dipy/preprocess.py b/nipype/interfaces/dipy/preprocess.py
index a5a81555b7..99b43da4c6 100644
--- a/nipype/interfaces/dipy/preprocess.py
+++ b/nipype/interfaces/dipy/preprocess.py
@@ -1,12 +1,4 @@
-#!/usr/bin/env python
 # -*- coding: utf-8 -*-
-"""
-Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/dipy/simulate.py b/nipype/interfaces/dipy/simulate.py
index 282f79519a..d6174908d9 100644
--- a/nipype/interfaces/dipy/simulate.py
+++ b/nipype/interfaces/dipy/simulate.py
@@ -1,10 +1,4 @@
 # -*- coding: utf-8 -*-
-"""Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from multiprocessing import (Pool, cpu_count)
diff --git a/nipype/interfaces/dipy/tensors.py b/nipype/interfaces/dipy/tensors.py
index ee19e6cd38..142c3b17de 100644
--- a/nipype/interfaces/dipy/tensors.py
+++ b/nipype/interfaces/dipy/tensors.py
@@ -1,10 +1,4 @@
 # -*- coding: utf-8 -*-
-"""Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/dipy/tracks.py b/nipype/interfaces/dipy/tracks.py
index a129ed043d..3a500317db 100644
--- a/nipype/interfaces/dipy/tracks.py
+++ b/nipype/interfaces/dipy/tracks.py
@@ -1,11 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/freesurfer/longitudinal.py b/nipype/interfaces/freesurfer/longitudinal.py
index 72b71adfe1..82208322c6 100644
--- a/nipype/interfaces/freesurfer/longitudinal.py
+++ b/nipype/interfaces/freesurfer/longitudinal.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various longitudinal commands provided by freesurfer
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/freesurfer/model.py b/nipype/interfaces/freesurfer/model.py
index afd9ea50fc..1c39726e34 100644
--- a/nipype/interfaces/freesurfer/model.py
+++ b/nipype/interfaces/freesurfer/model.py
@@ -3,13 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """The freesurfer module provides basic functions for interfacing with
    freesurfer tools.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/freesurfer/preprocess.py b/nipype/interfaces/freesurfer/preprocess.py
index b2d6173099..7226230516 100644
--- a/nipype/interfaces/freesurfer/preprocess.py
+++ b/nipype/interfaces/freesurfer/preprocess.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various commands provided by FreeSurfer
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/freesurfer/registration.py b/nipype/interfaces/freesurfer/registration.py
index ccc03f9103..64d2a3ea0e 100644
--- a/nipype/interfaces/freesurfer/registration.py
+++ b/nipype/interfaces/freesurfer/registration.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Provides interfaces to various longitudinal commands provided by freesurfer
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/freesurfer/utils.py b/nipype/interfaces/freesurfer/utils.py
index 0fdfd8bfdb..d6aec7b8a7 100644
--- a/nipype/interfaces/freesurfer/utils.py
+++ b/nipype/interfaces/freesurfer/utils.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Interfaces to assorted Freesurfer utility programs.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/fsl/aroma.py b/nipype/interfaces/fsl/aroma.py
index 97b3b17046..d7f8251bd8 100644
--- a/nipype/interfaces/fsl/aroma.py
+++ b/nipype/interfaces/fsl/aroma.py
@@ -3,12 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """This commandline module provides classes for interfacing with the
 `ICA-AROMA.py<https://github.com/rhr-pruim/ICA-AROMA>`_ command line tool.
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 
 from __future__ import (print_function, division, unicode_literals,
diff --git a/nipype/interfaces/fsl/dti.py b/nipype/interfaces/fsl/dti.py
index cf14d1072f..dab3c3ca11 100644
--- a/nipype/interfaces/fsl/dti.py
+++ b/nipype/interfaces/fsl/dti.py
@@ -4,13 +4,6 @@
 """The fsl module provides classes for interfacing with the `FSL
 <http://www.fmrib.ox.ac.uk/fsl/index.html>`_ command line tools.  This
 was written to work with FSL version 4.1.4.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/fsl/epi.py b/nipype/interfaces/fsl/epi.py
index 7cfbbac79a..e1b09230c8 100644
--- a/nipype/interfaces/fsl/epi.py
+++ b/nipype/interfaces/fsl/epi.py
@@ -4,13 +4,6 @@
 """The fsl module provides classes for interfacing with the `FSL
 <http://www.fmrib.ox.ac.uk/fsl/index.html>`_ command line tools.  This
 was written to work with FSL version 5.0.4.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import print_function, division, unicode_literals, \
     absolute_import
diff --git a/nipype/interfaces/fsl/maths.py b/nipype/interfaces/fsl/maths.py
index ef54b81965..c7636da785 100644
--- a/nipype/interfaces/fsl/maths.py
+++ b/nipype/interfaces/fsl/maths.py
@@ -2,14 +2,8 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """
-    The maths module provides higher-level interfaces to some of the operations
-    that can be performed with the fslmaths command-line program.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
+The maths module provides higher-level interfaces to some of the operations
+that can be performed with the fslmaths command-line program.
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/fsl/model.py b/nipype/interfaces/fsl/model.py
index 6b2224adb4..871fc558c9 100644
--- a/nipype/interfaces/fsl/model.py
+++ b/nipype/interfaces/fsl/model.py
@@ -4,12 +4,6 @@
 """The fsl module provides classes for interfacing with the `FSL
 <http://www.fmrib.ox.ac.uk/fsl/index.html>`_ command line tools.  This
 was written to work with FSL version 4.1.4.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/fsl/possum.py b/nipype/interfaces/fsl/possum.py
index 0adec72b8c..6eca7fb117 100644
--- a/nipype/interfaces/fsl/possum.py
+++ b/nipype/interfaces/fsl/possum.py
@@ -8,14 +8,6 @@
 Please, check out the link for pertinent citations using POSSUM.
 
   .. Note:: This was written to work with FSL version 5.0.6.
-
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    import os
-    filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    os.chdir(datadir)
-
 """
 
 from .base import FSLCommand, FSLCommandInputSpec
diff --git a/nipype/interfaces/fsl/preprocess.py b/nipype/interfaces/fsl/preprocess.py
index ae24c9c54b..77f6c31314 100644
--- a/nipype/interfaces/fsl/preprocess.py
+++ b/nipype/interfaces/fsl/preprocess.py
@@ -4,12 +4,6 @@
 """The fsl module provides classes for interfacing with the `FSL
 <http://www.fmrib.ox.ac.uk/fsl/index.html>`_ command line tools.  This
 was written to work with FSL version 4.1.4.
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/fsl/utils.py b/nipype/interfaces/fsl/utils.py
index 159e884a7c..7baec69256 100644
--- a/nipype/interfaces/fsl/utils.py
+++ b/nipype/interfaces/fsl/utils.py
@@ -8,13 +8,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    import os
-    filepath = os.path.dirname(os.path.realpath( __file__ ))
-    datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/io.py b/nipype/interfaces/io.py
index c4fdd75216..87c6ad9b2f 100644
--- a/nipype/interfaces/io.py
+++ b/nipype/interfaces/io.py
@@ -10,13 +10,6 @@
 
     To come :
     XNATSink
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/meshfix.py b/nipype/interfaces/meshfix.py
index 52f9e4f0bc..4b9db519a9 100644
--- a/nipype/interfaces/meshfix.py
+++ b/nipype/interfaces/meshfix.py
@@ -2,13 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """ Fixes meshes:
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/minc/minc.py b/nipype/interfaces/minc/minc.py
index 4c35248132..ba2071a594 100644
--- a/nipype/interfaces/minc/minc.py
+++ b/nipype/interfaces/minc/minc.py
@@ -7,14 +7,6 @@
 
 Author: Carlo Hamalainen <carlo@carlo-hamalainen.net>
         http://carlo-hamalainen.net
-
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/mrtrix/convert.py b/nipype/interfaces/mrtrix/convert.py
index 0f9e0f29ff..36b21ae2d7 100644
--- a/nipype/interfaces/mrtrix/convert.py
+++ b/nipype/interfaces/mrtrix/convert.py
@@ -1,13 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from io import open
diff --git a/nipype/interfaces/mrtrix/preprocess.py b/nipype/interfaces/mrtrix/preprocess.py
index 4de430bb58..5fc67177a1 100644
--- a/nipype/interfaces/mrtrix/preprocess.py
+++ b/nipype/interfaces/mrtrix/preprocess.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix/tensors.py b/nipype/interfaces/mrtrix/tensors.py
index 436dd75a6c..2ebe120aad 100644
--- a/nipype/interfaces/mrtrix/tensors.py
+++ b/nipype/interfaces/mrtrix/tensors.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix/tracking.py b/nipype/interfaces/mrtrix/tracking.py
index f159c1c29e..7a7ed995f0 100644
--- a/nipype/interfaces/mrtrix/tracking.py
+++ b/nipype/interfaces/mrtrix/tracking.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/base.py b/nipype/interfaces/mrtrix3/base.py
index eb4e834e70..0f80bda9c1 100644
--- a/nipype/interfaces/mrtrix3/base.py
+++ b/nipype/interfaces/mrtrix3/base.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/connectivity.py b/nipype/interfaces/mrtrix3/connectivity.py
index d6106ed9df..67e602df84 100644
--- a/nipype/interfaces/mrtrix3/connectivity.py
+++ b/nipype/interfaces/mrtrix3/connectivity.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/preprocess.py b/nipype/interfaces/mrtrix3/preprocess.py
index 740513194d..f11094a430 100644
--- a/nipype/interfaces/mrtrix3/preprocess.py
+++ b/nipype/interfaces/mrtrix3/preprocess.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/reconst.py b/nipype/interfaces/mrtrix3/reconst.py
index 833db6d01f..fcfe042284 100644
--- a/nipype/interfaces/mrtrix3/reconst.py
+++ b/nipype/interfaces/mrtrix3/reconst.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/tracking.py b/nipype/interfaces/mrtrix3/tracking.py
index d432d4c1fb..2c2476acae 100644
--- a/nipype/interfaces/mrtrix3/tracking.py
+++ b/nipype/interfaces/mrtrix3/tracking.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/mrtrix3/utils.py b/nipype/interfaces/mrtrix3/utils.py
index 2c02de75e4..779cd829fc 100644
--- a/nipype/interfaces/mrtrix3/utils.py
+++ b/nipype/interfaces/mrtrix3/utils.py
@@ -1,15 +1,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/niftyfit/asl.py b/nipype/interfaces/niftyfit/asl.py
index 67a944a550..c4920dc195 100644
--- a/nipype/interfaces/niftyfit/asl.py
+++ b/nipype/interfaces/niftyfit/asl.py
@@ -2,13 +2,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """
 The ASL module of niftyfit, which wraps the fitting methods in NiftyFit.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from ..base import TraitedSpec, traits, CommandLineInputSpec
diff --git a/nipype/interfaces/niftyfit/dwi.py b/nipype/interfaces/niftyfit/dwi.py
index 7130ba48ef..f8f93c7d12 100644
--- a/nipype/interfaces/niftyfit/dwi.py
+++ b/nipype/interfaces/niftyfit/dwi.py
@@ -2,13 +2,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """
 The dwi module of niftyfit, which wraps the fitting methods in NiftyFit.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from ..base import TraitedSpec, traits, isdefined, CommandLineInputSpec
diff --git a/nipype/interfaces/niftyfit/qt1.py b/nipype/interfaces/niftyfit/qt1.py
index 45f66f6a8a..ceefbae281 100644
--- a/nipype/interfaces/niftyfit/qt1.py
+++ b/nipype/interfaces/niftyfit/qt1.py
@@ -3,13 +3,6 @@
 """
 The QT1 module of niftyfit, which wraps the Multi-Echo T1 fitting methods
 in NiftyFit.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from ..base import TraitedSpec, File, traits, CommandLineInputSpec
diff --git a/nipype/interfaces/niftyreg/reg.py b/nipype/interfaces/niftyreg/reg.py
index 7096d5f5f3..f36752b872 100644
--- a/nipype/interfaces/niftyreg/reg.py
+++ b/nipype/interfaces/niftyreg/reg.py
@@ -6,13 +6,6 @@
 <http://niftyreg.sourceforge.net>`_ registration command line tools.
 
 The interfaces were written to work with niftyreg version 1.5.10
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from __future__ import (print_function, division, unicode_literals,
diff --git a/nipype/interfaces/niftyreg/regutils.py b/nipype/interfaces/niftyreg/regutils.py
index 7c3ed28eaf..e6ed97bd9a 100644
--- a/nipype/interfaces/niftyreg/regutils.py
+++ b/nipype/interfaces/niftyreg/regutils.py
@@ -5,13 +5,6 @@
 <http://niftyreg.sourceforge.net>`_ utility command line tools.
 
 The interfaces were written to work with niftyreg version 1.5.10
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from __future__ import (print_function, division, unicode_literals,
diff --git a/nipype/interfaces/niftyseg/em.py b/nipype/interfaces/niftyseg/em.py
index 47c0659b30..d378e0ad3e 100644
--- a/nipype/interfaces/niftyseg/em.py
+++ b/nipype/interfaces/niftyseg/em.py
@@ -9,13 +9,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from ..base import (TraitedSpec, File, traits, CommandLineInputSpec,
diff --git a/nipype/interfaces/niftyseg/label_fusion.py b/nipype/interfaces/niftyseg/label_fusion.py
index 471458b743..1b0237d37c 100644
--- a/nipype/interfaces/niftyseg/label_fusion.py
+++ b/nipype/interfaces/niftyseg/label_fusion.py
@@ -3,13 +3,6 @@
 """
 The fusion module provides higher-level interfaces to some of the operations
 that can be performed with the seg_LabFusion command-line program.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 from builtins import str
diff --git a/nipype/interfaces/niftyseg/lesions.py b/nipype/interfaces/niftyseg/lesions.py
index 028e751f2e..14d7f23c6b 100644
--- a/nipype/interfaces/niftyseg/lesions.py
+++ b/nipype/interfaces/niftyseg/lesions.py
@@ -9,13 +9,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 import warnings
diff --git a/nipype/interfaces/niftyseg/maths.py b/nipype/interfaces/niftyseg/maths.py
index 46295bc6bc..d4773f86e8 100644
--- a/nipype/interfaces/niftyseg/maths.py
+++ b/nipype/interfaces/niftyseg/maths.py
@@ -9,13 +9,6 @@
 Examples
 --------
 See the docstrings of the individual classes for examples.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 import os
diff --git a/nipype/interfaces/niftyseg/patchmatch.py b/nipype/interfaces/niftyseg/patchmatch.py
index 7aa3a5ae88..5732b1ba17 100644
--- a/nipype/interfaces/niftyseg/patchmatch.py
+++ b/nipype/interfaces/niftyseg/patchmatch.py
@@ -3,13 +3,6 @@
 """
 The fusion module provides higher-level interfaces to some of the operations
 that can be performed with the seg_DetectLesions command-line program.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 
 import warnings
diff --git a/nipype/interfaces/niftyseg/stats.py b/nipype/interfaces/niftyseg/stats.py
index 5f57779f35..796e07410c 100644
--- a/nipype/interfaces/niftyseg/stats.py
+++ b/nipype/interfaces/niftyseg/stats.py
@@ -3,13 +3,6 @@
 """
 The stats module provides higher-level interfaces to some of the operations
 that can be performed with the niftyseg stats (seg_stats) command-line program.
-
-Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/\
-data'))
-    >>> os.chdir(datadir)
 """
 from __future__ import print_function
 import numpy as np
diff --git a/nipype/interfaces/nilearn.py b/nipype/interfaces/nilearn.py
index 1d7bdff0e5..3a77af9f57 100644
--- a/nipype/interfaces/nilearn.py
+++ b/nipype/interfaces/nilearn.py
@@ -3,13 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 '''
 Algorithms to compute statistics on :abbr:`fMRI (functional MRI)`
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 '''
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/nipy/preprocess.py b/nipype/interfaces/nipy/preprocess.py
index a3566e07a9..973344af94 100644
--- a/nipype/interfaces/nipy/preprocess.py
+++ b/nipype/interfaces/nipy/preprocess.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 from builtins import open
diff --git a/nipype/interfaces/nipy/utils.py b/nipype/interfaces/nipy/utils.py
index 781263f317..12e593e1b1 100644
--- a/nipype/interfaces/nipy/utils.py
+++ b/nipype/interfaces/nipy/utils.py
@@ -1,12 +1,4 @@
 # -*- coding: utf-8 -*-
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/petpvc.py b/nipype/interfaces/petpvc.py
index c26dd4d588..59f87b482f 100644
--- a/nipype/interfaces/petpvc.py
+++ b/nipype/interfaces/petpvc.py
@@ -1,13 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/interfaces/quickshear.py b/nipype/interfaces/quickshear.py
index 4b0f8dd01c..b1317c3599 100644
--- a/nipype/interfaces/quickshear.py
+++ b/nipype/interfaces/quickshear.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 """ Quickshear is a simple geometric defacing algorithm
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import unicode_literals
 
diff --git a/nipype/interfaces/spm/model.py b/nipype/interfaces/spm/model.py
index f7df523587..c82811bc35 100644
--- a/nipype/interfaces/spm/model.py
+++ b/nipype/interfaces/spm/model.py
@@ -3,13 +3,6 @@
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """The spm module provides basic functions for interfacing with matlab
 and spm to access spm tools.
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/spm/preprocess.py b/nipype/interfaces/spm/preprocess.py
index 1451a55ce4..dfcc93a0a5 100644
--- a/nipype/interfaces/spm/preprocess.py
+++ b/nipype/interfaces/spm/preprocess.py
@@ -2,12 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """SPM wrappers for preprocessing data
-
-   Change directory to provide relative paths for doctests
-   >>> import os
-   >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-   >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-   >>> os.chdir(datadir)
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/utility/csv.py b/nipype/interfaces/utility/csv.py
index 54fbe91ba9..16c377e3b5 100644
--- a/nipype/interfaces/utility/csv.py
+++ b/nipype/interfaces/utility/csv.py
@@ -2,14 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """CSV Handling utilities
-
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath(__file__))
-    >>> datadir = os.path.realpath(os.path.join(filepath,
-    ...                            '../../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/interfaces/vista/vista.py b/nipype/interfaces/vista/vista.py
index 729b36aaa0..5000036d02 100644
--- a/nipype/interfaces/vista/vista.py
+++ b/nipype/interfaces/vista/vista.py
@@ -1,14 +1,6 @@
 # -*- coding: utf-8 -*-
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
-"""
-    Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-    >>> os.chdir(datadir)
-
-"""
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
 
diff --git a/nipype/pipeline/engine/base.py b/nipype/pipeline/engine/base.py
index 0883023f63..39bfbd7a6f 100644
--- a/nipype/pipeline/engine/base.py
+++ b/nipype/pipeline/engine/base.py
@@ -5,14 +5,6 @@
 """Defines functionality for pipelined execution of interfaces
 
 The `EngineBase` class implements the more general view of a task.
-
-  .. testsetup::
-     # Change directory to provide relative paths for doctests
-     import os
-     filepath = os.path.dirname(os.path.realpath( __file__ ))
-     datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-     os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/pipeline/engine/nodes.py b/nipype/pipeline/engine/nodes.py
index 7c3c40a3ad..eb0562ae0e 100644
--- a/nipype/pipeline/engine/nodes.py
+++ b/nipype/pipeline/engine/nodes.py
@@ -4,14 +4,6 @@
 """Defines functionality for pipelined execution of interfaces
 
 The `Node` class provides core functionality for batch processing.
-
-  .. testsetup::
-     # Change directory to provide relative paths for doctests
-     import os
-     filepath = os.path.dirname(os.path.realpath( __file__ ))
-     datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-     os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/pipeline/engine/workflows.py b/nipype/pipeline/engine/workflows.py
index c6a9047337..8abef8bf14 100644
--- a/nipype/pipeline/engine/workflows.py
+++ b/nipype/pipeline/engine/workflows.py
@@ -5,14 +5,6 @@
 """Defines functionality for pipelined execution of interfaces
 
 The `Workflow` class provides core functionality for batch processing.
-
-  .. testsetup::
-     # Change directory to provide relative paths for doctests
-     import os
-     filepath = os.path.dirname(os.path.realpath( __file__ ))
-     datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
-     os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/nipype/pytest.ini b/nipype/pytest.ini
index 835b6381c9..70f12b64aa 100644
--- a/nipype/pytest.ini
+++ b/nipype/pytest.ini
@@ -1,4 +1,6 @@
 [pytest]
 norecursedirs = .git build dist doc nipype/external tools examples src
-addopts = --doctest-modules
+addopts = --doctest-modules -n auto
 doctest_optionflags = ALLOW_UNICODE NORMALIZE_WHITESPACE
+env =
+    PYTHONHASHSEED=0
diff --git a/nipype/testing/fixtures.py b/nipype/testing/fixtures.py
index fb2ed1327a..314363bd6d 100644
--- a/nipype/testing/fixtures.py
+++ b/nipype/testing/fixtures.py
@@ -103,7 +103,7 @@ def set_output_type(fsl_output_type):
     return prev_output_type
 
 
-@pytest.fixture(params=[None] + list(Info.ftypes))
+@pytest.fixture(params=[None] + sorted(Info.ftypes))
 def create_files_in_directory_plus_output_type(request, tmpdir):
     func_prev_type = set_output_type(request.param)
     origdir = tmpdir.chdir()
diff --git a/nipype/utils/filemanip.py b/nipype/utils/filemanip.py
index 4b4942227e..15f8dc93bb 100644
--- a/nipype/utils/filemanip.py
+++ b/nipype/utils/filemanip.py
@@ -2,14 +2,6 @@
 # emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
 # vi: set ft=python sts=4 ts=4 sw=4 et:
 """Miscellaneous file manipulation functions
-
-  .. testsetup::
-    # Change directory to provide relative paths for doctests
-    >>> import os
-    >>> filepath = os.path.dirname(os.path.realpath( __file__ ))
-    >>> datadir = os.path.realpath(os.path.join(filepath, '../testing/data'))
-    >>> os.chdir(datadir)
-
 """
 from __future__ import (print_function, division, unicode_literals,
                         absolute_import)
diff --git a/requirements.txt b/requirements.txt
index a5ac0a5683..934c2b42da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,8 @@ click>=6.6.0
 funcsigs
 configparser
 pytest>=3.0
+pytest-xdist
+pytest-env
 mock
 pydotplus
 pydot>=1.2.3