Fix for folder tests on Windows (#952)

test/test_folder.py

@@ -14,11 +14,11 @@ def mock_transform(return_value, arg_list):
 
 
 class Tester(unittest.TestCase):
-    root = get_file_path_2('test/assets/dataset/')
+    root = os.path.normpath(get_file_path_2('test/assets/dataset/'))
     classes = ['a', 'b']
-    class_a_images = [get_file_path_2(os.path.join('test/assets/dataset/a/', path))
+    class_a_images = [os.path.normpath(get_file_path_2(os.path.join('test/assets/dataset/a/', path)))
                       for path in ['a1.png', 'a2.png', 'a3.png']]
-    class_b_images = [get_file_path_2(os.path.join('test/assets/dataset/b/', path))
+    class_b_images = [os.path.normpath(get_file_path_2(os.path.join('test/assets/dataset/b/', path)))
                       for path in ['b1.png', 'b2.png', 'b3.png', 'b4.png']]
 
     def test_image_folder(self):
@@ -51,7 +51,7 @@ class Tester(unittest.TestCase):
         self.assertEqual(imgs, outputs)
 
     def test_transform(self):
-        return_value = get_file_path_2('test/assets/dataset/a/a1.png')
+        return_value = os.path.normpath(get_file_path_2('test/assets/dataset/a/a1.png'))
 
         args = []
         transform = mock_transform(return_value, args)