TST : minor changes to tests

 - don't use pylab
 - add @clean up to not leak to other tests

The minor tick locator needs to be attached to an axis object (as
it depends on where the major ticks are to sort out where the
minor ticks) so it is easiest to just make a figure/axes and test
on that.

Author: tacaswell

lib/matplotlib/tests/test_ticker.py

@@ -7,9 +7,9 @@
 from numpy.testing import assert_almost_equal
 import numpy as np
 import matplotlib
-
+import matplotlib.pyplot as plt
 import matplotlib.ticker as mticker
-
+from matplotlib.testing.decorators import cleanup
 
 def test_MaxNLocator():
     loc = mticker.MaxNLocator(nbins=5)
@@ -36,10 +36,9 @@ def test_MultipleLocator():
     assert_almost_equal(loc.tick_values(-7, 10), test_value)
 
 
+@cleanup
 def test_AutoMinorLocator():
-    from pylab import figure
-    fig = figure()
-    ax = fig.add_subplot(111)
+    fig, ax = plt.subplots()
     ax.set_xlim(0, 1.39)
     ax.minorticks_on()
     test_value = np.array([0.05, 0.1, 0.15, 0.25, 0.3, 0.35, 0.45,