adding FilePerms tests

boltons/fileutils.py

@@ -408,22 +408,8 @@ copytree = copy_tree  # alias for drop-in replacement of shutil
 
 
 if __name__ == '__main__':
+    pass
     #with atomic_save('/tmp/final.txt') as f:
     #    f.write('rofl')
     #    raise ValueError('nope')
     #    f.write('\n')
-
-    def _main():
-        up = FilePerms()
-        up.other = ''
-        up.user = 'xrw'
-        up.group = 'rrrwx'
-        try:
-            up.other = 'nope'
-        except ValueError:
-            pass
-        print(up)
-        print('user:', up.user)
-        print(oct(int(up)))
-        print(oct(int(FilePerms())))
-    _main()

tests/test_fileutils.py

@@ -0,0 +1,21 @@
+# -*- coding: utf-8 -*-
+
+from boltons.fileutils import FilePerms
+
+
+def test_fileperms():
+    up = FilePerms()
+    up.other = ''
+    up.user = 'xrw'
+    up.group = 'rrrwx'
+    try:
+        up.other = 'nope'
+    except ValueError:
+        # correctly raised ValueError on invalid chars
+        pass
+
+    assert repr(up) == "FilePerms(user='rwx', group='rwx', other='')"
+    assert up.user == 'rwx'
+    assert oct(int(up)).endswith('770')  # 0770 on py2 and 0o770 on py3
+
+    assert int(FilePerms()) == 0