Migrate test runner to py.test

Migrating test runner from `unittest2`/`nose` to `pytest`.
The pytest runner is also compatible with both unittest and nose tests.
Some of the benefits of PyTest include:
    * using plain asserts
    * function-based fixtures instead of setUp and tearDown
    * no strange camelCase methods

1 files changed, 46 insertions, 0 deletions

diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..5d53edd
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,46 @@
+# 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.
+
+"""Common testing tools for OAuth2Client tests."""
+
+import sys
+
+from six.moves import reload_module
+
+from oauth2client import util
+
+
+def set_up_gae_environment(gae_sdk_path):
+    """Set up appengine SDK third-party imports."""
+    if 'google' in sys.modules:
+        # Some packages, such as protobuf, clobber the google
+        # namespace package. This prevents that.
+        reload_module(sys.modules['google'])
+
+    # This sets up google-provided libraries.
+    sys.path.insert(0, gae_sdk_path)
+    import dev_appserver
+    dev_appserver.fix_sys_path()
+
+    # Fixes timezone and other os-level items.
+    import google.appengine.tools.os_compat  # noqa: unused import
+
+
+def pytest_configure(config):
+    """Pytest hook function for setting up test session."""
+    # Set up Google SDK modules unless specified not to
+    if not config.option.no_gae:
+        set_up_gae_environment(config.option.sdk_path)
+    # Default of POSITIONAL_WARNING is too verbose for testing
+    util.positional_parameters_enforcement = util.POSITIONAL_EXCEPTION