Adds a small test for plotwrapper

tests/test_utils.py

@@ -0,0 +1,33 @@
+import matplotlib
+import matplotlib.pyplot as plt
+from pyret.utils import plotwrapper
+
+
+def test_plotwrapper():
+
+    def dummy(**kwargs):
+        pass
+
+    f = plotwrapper(dummy)
+
+    plt.close('all')
+    fig, ax = f()
+    assert type(fig) is matplotlib.figure.Figure
+    assert issubclass(type(ax), matplotlib.axes.Axes)
+
+    plt.close('all')
+    fig, ax = f(fig=plt.gcf())
+    assert fig is plt.gcf()
+    assert issubclass(type(ax), matplotlib.axes.Axes)
+
+    plt.close('all')
+    fig, ax = f(fig=plt.gcf(), ax=plt.gca())
+    assert fig is plt.gcf()
+    assert ax is plt.gca()
+
+    plt.close('all')
+    _fig = plt.figure()
+    _ax = _fig.add_subplot(111)
+    fig, ax = f(ax=_ax)
+    assert fig is _fig
+    assert ax is _ax