add test and format code with pep8

Author: BruceZhang1993

.gitignore

@@ -6,3 +6,4 @@ __pycache__
 /dist
 *.egg-info
 /.eggs
+/.pytest_cache

index_generator/models/entries.py

@@ -1,8 +1,9 @@
 import os
 import mimetypes
 
+
 def sizeof_fmt(num, suffix='B'):
-    for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']:
+    for unit in ['', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi']:
         if abs(num) < 1024.0:
             if unit == '':
                 return '%3.0f %s%s' % (num, unit, suffix)
@@ -11,6 +12,7 @@ def sizeof_fmt(num, suffix='B'):
         num /= 1024.0
     return '%.1f %s%s' % (num, 'Yi', suffix)
 
+
 class Entry(object):
     def __init__(self, file, root, base='/', human=False):
         path = root + os.path.sep + file
@@ -23,4 +25,3 @@ def __init__(self, file, root, base='/', human=False):
             self.size = os.path.getsize(path)
         self.modified = os.path.getmtime(path)
         self.isDir = os.path.isdir(path)
-