Unit tests can now be run with core dependencies only (param and numpy)

tests/__init__.py

@@ -1,8 +1,11 @@
 import os, sys
 
-# Standardize backend due to random inconsistencies
-from matplotlib import pyplot
-pyplot.switch_backend('agg')
+try:
+    # Standardize backend due to random inconsistencies
+    from matplotlib import pyplot
+    pyplot.switch_backend('agg')
+except:
+    pass
 
 cwd = os.path.abspath(os.path.split(__file__)[0])
 sys.path.insert(0, os.path.join(cwd, '..'))

tests/testmagics.py

@@ -1,7 +1,11 @@
-from holoviews.core.options import Store
+from unittest import SkipTest
 
-from holoviews import ipython
-from holoviews.ipython import IPTestCase
+from holoviews.core.options import Store
+try:
+    from holoviews import ipython
+    from holoviews.ipython import IPTestCase
+except ImportError:
+    raise SkipTest("Required dependencies not satisfied for testing magics")
 
 from holoviews.operation import Compositor
 

tests/testoptscompleter.py

@@ -1,9 +1,14 @@
 """
-Tests the OptCompleter class for tab-completion in the opts magic.
+Tests the OptsCompleter class for tab-completion in the opts magic.
 """
-from holoviews import ipython
-from holoviews.ipython import IPTestCase
-from holoviews.ipython.magics import OptsCompleter
+
+from unittest import SkipTest
+try:
+    from holoviews import ipython
+    from holoviews.ipython import IPTestCase
+    from holoviews.ipython.magics import OptsCompleter
+except ImportError:
+    raise SkipTest("Required dependencies not satisfied for testing OptsCompleter")
 
 
 class TestOptsCompleter(IPTestCase):

tests/testrenderclass.py

@@ -1,4 +1,5 @@
 from hashlib import sha256
+from unittest import SkipTest
 import numpy as np
 
 from holoviews import HoloMap, Store
@@ -7,10 +8,12 @@
 
 from nose.plugins.attrib import attr
 
-# Standardize backend due to random inconsistencies
-from matplotlib import pyplot
-pyplot.switch_backend('agg')
-
+try:
+    # Standardize backend due to random inconsistencies
+    from matplotlib import pyplot
+    pyplot.switch_backend('agg')
+except:
+    pyplot = None
 
 def digest_data(data):
     hashfn = sha256()
@@ -26,6 +29,9 @@ class MPLPlotRendererTest(ComparisonTestCase):
     """
 
     def setUp(self):
+        if pyplot is None:
+            raise SkipTest("Matplotlib required to test widgets")
+
         self.basename = 'no-file'
         self.image1 = Image(np.array([[0,1],[2,3]]), label='Image1')
         self.image2 = Image(np.array([[1,0],[4,-2]]), label='Image2')

tests/testwidgets.py

@@ -3,14 +3,17 @@
 """
 import re
 from hashlib import sha256
+from unittest import SkipTest
 import numpy as np
 
-from holoviews.ipython import IPTestCase
-from holoviews.ipython.widgets import ScrubberWidget, SelectionWidget
-
-# Standardize backend due to random inconsistencies
-from matplotlib import pyplot
-pyplot.switch_backend('agg')
+try:
+    from holoviews.ipython import IPTestCase
+    from holoviews.ipython.widgets import ScrubberWidget, SelectionWidget
+    # Standardize backend due to random inconsistencies
+    from matplotlib import pyplot
+    pyplot.switch_backend('agg')
+except:
+    raise SkipTest("Matplotlib required to test widgets")
 
 from holoviews import Image, HoloMap
 from holoviews.plotting import RasterPlot