test README.md snippet

Author: nschloe

.travis.yml

@@ -31,7 +31,8 @@ addons:
       - python-tk
 
 before_install:
-  - pip install pytest pytest-cov
+  - pip install pytest pytest-cov code_extract
+  - code_extract README.md test/readme_test.py --filter python,test
 
 install:
   - pip install -r test_requirements.txt

README.md

@@ -20,10 +20,11 @@ sits on top of TikZ and describes graphs in terms of axes, data etc.
 Consequently, the output of matplotlib2tikz retains more information, can be
 more easily understood, and is more easily editable than [raw TikZ output](http://matplotlib.org/users/whats_new.html#pgf-tikz-backend).
 For example, the matplotlib figure
-```python
+```python,test
 import matplotlib.pyplot as plt
 from matplotlib import style
 import numpy as np
+
 fig = plt.figure()
 style.use('ggplot')
 t = np.arange(0.0, 2.0, 0.1)