Added Auto Image functionality to ImageTransformationMixin

Author: santhoshmoback

filestack/mixins/imagetransformation.py

@@ -143,6 +143,9 @@ def av_convert(self, *, preset=None, force=None, title=None, extname=None, filen
             new_transform.url, uuid, timestamp, apikey=new_transform.apikey, security=new_transform.security
         )
 
+    def auto_image(self):
+        return self._add_transform_task('auto_image', locals())
+
     def _add_transform_task(self, transformation, params):
         if isinstance(self, filestack.models.Transformation):
             instance = self

tests/transformation_test.py

@@ -310,3 +310,9 @@ def test_av_convert(post_mock, transform):
     assert isinstance(new_av, AudioVisual)
     assert new_av.uuid == 'someuuid'
     assert new_av.timestamp == 'sometimestamp'
+
+
+def test_auto_image(transform):
+    target_url = '{}/{}/auto_image/{}'.format(config.CDN_URL, APIKEY, EXTERNAL_URL)
+    auto_image = transform.auto_image()
+    assert auto_image.url == target_url