adding alines test 1

Author: Aaron Soellinger

tests/reference_images/alines01.png

@@ -0,0 +1,51 @@
+import os
+import os.path
+import glob
+import mplfinance        as mpf
+import matplotlib.pyplot as plt
+from   matplotlib.testing.compare import compare_images
+
+print('mpf.__version__ =',mpf.__version__)                 # for the record
+print("plt.rcParams['backend'] =",plt.rcParams['backend']) # for the record
+
+base='alines'
+tdir = os.path.join('tests','test_images')
+refd = os.path.join('tests','reference_images')
+
+globpattern = os.path.join(tdir,base+'*.png')
+oldtestfiles = glob.glob(globpattern)
+
+for fn in oldtestfiles:
+    try:
+        os.remove(fn)
+    except:
+        print('Error removing file "'+fn+'"')
+
+IMGCOMP_TOLERANCE = 10.0  # this works fine for linux
+# IMGCOMP_TOLERANCE = 11.0  # required for a windows pass. (really 10.25 may do it).
+
+def test_alines01(bolldata):
+
+    df = bolldata
+
+    fname = base+'01.png'
+    tname = os.path.join(tdir,fname)
+    rname = os.path.join(refd,fname)
+    segments1 = [('2011-09-13', 115.),('2012-02-06', 135.)]
+    fig_axis = mpf.plot(
+        df,volume=True,savefig=tname,returnfig=True,alines=segments1
+    )
+
+    plt.close(fig_axis[0])
+
+    tsize = os.path.getsize(tname)
+    print(glob.glob(tname),'[',tsize,'bytes',']')
+
+    rsize = os.path.getsize(rname)
+    print(glob.glob(rname),'[',rsize,'bytes',']')
+
+    result = compare_images(rname,tname,tol=IMGCOMP_TOLERANCE)
+    if result is not None:
+        print('result=',result)
+    assert result is None
+