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

* Add tests for quickstarts
* Update secrets

Author: Jon Wayne Parrott

samples/snippets/quickstart_test.py

@@ -0,0 +1,45 @@
+# 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.
+
+from google.cloud import bigquery
+import pytest
+
+import quickstart
+
+
+# Must match the dataset listed in quickstart.py (there's no easy way to
+# extract this).
+DATASET_ID = 'my_new_dataset'
+
+
+@pytest.fixture
+def temporary_dataset():
+    """Fixture that ensures the test dataset does not exist before or
+    after a test."""
+    bigquery_client = bigquery.Client()
+    dataset = bigquery_client.dataset(DATASET_ID)
+
+    if dataset.exists():
+        dataset.delete()
+
+    yield
+
+    if dataset.exists():
+        dataset.delete()
+
+
+def test_quickstart(capsys, temporary_dataset):
+    quickstart.run_quickstart()
+    out, _ = capsys.readouterr()
+    assert DATASET_ID in out