enhanced tests

Fabian Kloosterman · Fabian Kloosterman · commit c4f25e9d9a56 · 2018-01-26T11:44:08.000+01:00
diff --git a/lib/matplotlib/tests/test_scale.py b/lib/matplotlib/tests/test_scale.py
@@ -2,6 +2,7 @@
 
 from matplotlib.testing.decorators import image_comparison
 import matplotlib.pyplot as plt
+from matplotlib.scale import Log10Transform, InvertedLog10Transform
 import numpy as np
 import io
 import pytest
@@ -80,12 +81,19 @@ def test_logscale_invert_transform():
     # get transformation from data to axes
     tform = (ax.transAxes + ax.transData.inverted()).inverted()
 
+    # direct test of log transform inversion
+    assert isinstance(Log10Transform().inverted(), InvertedLog10Transform)
 
 def test_logscale_transform_repr():
+    # check that repr of log transform succeeds
     fig, ax = plt.subplots()
     ax.set_yscale('log')
     s = repr(ax.transData)
 
+    # check that repr of log transform returns correct string
+    s = repr(Log10Transform(nonpos='clip'))
+    assert s == "Log10Transform('clip')"
+
 
 @image_comparison(baseline_images=['logscale_nonpos_values'], remove_text=True,
                   extensions=['png'], style='mpl20')
