Merge pull request #45 from DanielGoldfarb/master

regression tests for new api

Author: DanielGoldfarb

examples/mpftests/reference_images/addplot01.png

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+import os                as os
+import pandas            as pd
+import mplfinance        as mpf
+import matplotlib.pyplot as plt
+from matplotlib.testing.compare import compare_images
+
+print('pd.__version__  =',pd.__version__ )                 # for the record
+print('mpf.__version__ =',mpf.__version__)                 # for the record
+print("plt.rcParams['backend'] =",plt.rcParams['backend']) # for the record
+
+import subprocess
+pwd = subprocess.run(['pwd'], stdout=subprocess.PIPE)
+print('pwd.stdout=',pwd.stdout)
+
+
+df = pd.read_csv('../data/SPY_20110701_20120630_Bollinger.csv',index_col=0,parse_dates=True)
+print('df.shape='  , df.shape  )
+print('df.head(3)=', df.head(3))
+print('df.tail(3)=', df.tail(3))
+
+prefix='addplot'
+tdir='test_images/'
+refd='reference_images/'
+#os.system('rm -f '+tdir+prefix+'*.jpg')
+os.system('rm -f '+tdir+prefix+'*.png')
+
+IMGCOMP_TOLERANCE = 7.0
+
+# ---- Test 01 -----
+
+fname=prefix+'01.png'
+mpf.plot(df,volume=True,savefig=tdir+fname)
+
+os.system('ls -l '+tdir+fname)
+
+result = compare_images(refd+fname,tdir+fname,tol=IMGCOMP_TOLERANCE)
+if result is not None:
+   print('result=',result)
+assert result is None
+
+# ---- Test 02 -----
+
+fname=prefix+'02.png'
+apdict = mpf.make_addplot(df['LowerB'])
+mpf.plot(df,volume=True,addplot=apdict,savefig=tdir+fname)
+
+os.system('ls -l '+tdir+fname)
+
+result = compare_images(refd+fname,tdir+fname,tol=IMGCOMP_TOLERANCE)
+if result is not None:
+   print('result=',result)
+assert result is None