Quickstart tests [(#569)](GoogleCloudPlatform/python-docs-samples#569)

* Add tests for quickstarts
* Update secrets

samples/snippets/quickstart.py

@@ -18,6 +18,7 @@
 def run_quickstart():
     # [START vision_quickstart]
     import io
+    import os
 
     # Imports the Google Cloud client library
     from google.cloud import vision
@@ -26,11 +27,15 @@ def run_quickstart():
     vision_client = vision.Client()
 
     # The name of the image file to annotate
-    fileName = './resources/wakeupcat.jpg'
+    file_name = os.path.join(
+        os.path.dirname(__file__),
+        'resources/wakeupcat.jpg')
 
     # Loads the image into memory
-    with io.open(fileName, 'rb') as image_file:
-        image = vision_client.image(content=image_file.read())
+    with io.open(file_name, 'rb') as image_file:
+        content = image_file.read()
+        image = vision_client.image(
+            content=content)
 
     # Performs label detection on the image file
     labels = image.detect_labels()

samples/snippets/quickstart_test.py

@@ -0,0 +1,21 @@
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import quickstart
+
+
+def test_quickstart(capsys):
+    quickstart.run_quickstart()
+    out, _ = capsys.readouterr()
+    assert 'Labels' in out