test : tests added.

test/warning_test.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 """
 >>> import os
+>>> import json
 >>> from samila import *
 >>> from pytest import warns
 >>> with warns(RuntimeWarning, match="Neither function nor data is provided."):
@@ -14,5 +15,9 @@
 True
 >>> g_.data2 == g.data2
 True
+>>> with open('data.json', 'w') as fp:
+...     json.dump({'data1': [0], 'data2': [0], 'matplotlib_version': '0'}, fp)
+>>> with warns(RuntimeWarning, match="Source matplotlib version is different from yours, plots may be different."):
+...     g = GenerativeImage(lambda x,y: 0, lambda x,y: 0, data=open('data.json', 'r'))
 >>> os.remove('data.json')
 """