Add Filename system test.

Author: daspecster

system_tests/vision.py

@@ -84,6 +84,14 @@ def test_detect_logos_content(self):
         logo = logos[0]
         self._assert_logo(logo)
 
+    def test_detect_logos_filename(self):
+        client = Config.CLIENT
+        image = client.image(filename=LOGO_FILE)
+        logos = image.detect_logos()
+        self.assertEqual(len(logos), 1)
+        logo = logos[0]
+        self._assert_logo(logo)
+
     def test_detect_logos_gcs(self):
         bucket_name = Config.TEST_BUCKET.name
         blob_name = 'logo.png'