Add api_core package (#4210)

* Add api_core package

* Address review comments

1 files changed, 37 insertions, 0 deletions

diff --git a/tests/unit/future/test__helpers.py b/tests/unit/future/test__helpers.py
new file mode 100644
index 0000000..660d23a
--- /dev/null
+++ b/tests/unit/future/test__helpers.py
@@ -0,0 +1,37 @@
+# Copyright 2017, Google Inc.
+#
+# 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 mock
+
+from google.api_core.future import _helpers
+
+
+@mock.patch('threading.Thread', autospec=True)
+def test_start_deamon_thread(unused_thread):
+    deamon_thread = _helpers.start_daemon_thread(target=mock.sentinel.target)
+    assert deamon_thread.daemon is True
+
+
+def test_safe_invoke_callback():
+    callback = mock.Mock(spec=['__call__'], return_value=42)
+    result = _helpers.safe_invoke_callback(callback, 'a', b='c')
+    assert result == 42
+    callback.assert_called_once_with('a', b='c')
+
+
+def test_safe_invoke_callback_exception():
+    callback = mock.Mock(spec=['__call__'], side_effect=ValueError())
+    result = _helpers.safe_invoke_callback(callback, 'a', b='c')
+    assert result is None
+    callback.assert_called_once_with('a', b='c')