added test_quiver module

tests memory leaks reported in issue #2556
matplotlib · mdboom · Jan 27, 2014 · Oct 29, 2013 · Oct 31, 2013 · Jan 13, 2014
commit c312ccac6ae9e09e2c12f05ec27059d688c48a45
diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
@@ -1255,6 +1255,7 @@ def tk_window_focus():
     'matplotlib.tests.test_patheffects',
     'matplotlib.tests.test_pickle',
     'matplotlib.tests.test_png',
+    'matplotlib.tests.test_quiver',
     'matplotlib.tests.test_rcparams',
     'matplotlib.tests.test_scale',
     'matplotlib.tests.test_simplification',

diff --git a/lib/matplotlib/tests/test_quiver.py b/lib/matplotlib/tests/test_quiver.py
@@ -0,0 +1,54 @@
+from __future__ import print_function
+import os
+import tempfile
+import numpy as np
+import sys
+from matplotlib import pyplot as plt
+from matplotlib.testing.decorators import cleanup
+
+
+WRITER_OUTPUT = dict(ffmpeg='mp4', ffmpeg_file='mp4',
+                     mencoder='mp4', mencoder_file='mp4',
+                     avconv='mp4', avconv_file='mp4',
+                     imagemagick='gif', imagemagick_file='gif')
+
+
+@cleanup
+def test_quiver_memory_leak():
+    fig, ax = plt.subplots()
+
+    X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .04),
+                        np.arange(0, 2 * np.pi, .04))
+    U = np.cos(X)
+    V = np.sin(Y)
+
+    Q = ax.quiver(U, V)
+    ttX = Q.X
+    Q.remove()
+
+    del Q
+
+    assert sys.getrefcount(ttX) == 2
+
+
+@cleanup
+def test_quiver_key_memory_leak():
+    fig, ax = plt.subplots()
+
+    X, Y = np.meshgrid(np.arange(0, 2 * np.pi, .04),
+                        np.arange(0, 2 * np.pi, .04))
+    U = np.cos(X)
+    V = np.sin(Y)
+
+    Q = ax.quiver(U, V)
+
+    qk = ax.quiverkey(Q, 0.5, 0.92, 2, r'$2 \frac{m}{s}$',
+                   labelpos='W',
+                   fontproperties={'weight': 'bold'})
+    assert sys.getrefcount(qk) == 3
+    qk.remove()
+    assert sys.getrefcount(qk) == 2
+
+if __name__ == '__main__':
+    import nose
+    nose.runmodule()