added test case for eventplot default params

Author: alimuldal

lib/matplotlib/tests/baseline_images/test_axes/test_eventplot_defaults.png

@@ -2187,6 +2187,23 @@ def test_eventplot():
     np.testing.assert_equal(num_collections, num_datasets)
 
 
+@image_comparison(baseline_images=['test_eventplot_defaults'], extensions=['png'], remove_text=True)
+def test_eventplot_defaults():
+    '''
+    test that eventplot produces the correct output given the default params
+    (see bug #3728)
+    '''
+    np.random.seed(0)
+
+    data1 = np.random.random([32, 20]).tolist()
+    data2 = np.random.random([6, 20]).tolist()
+    data = data1 + data2
+
+    fig = plt.figure()
+    axobj = fig.add_subplot(111)
+    colls = axobj.eventplot(data)
+
+
 @cleanup
 def test_empty_eventplot():
     fig, ax = plt.subplots(1, 1)