Cifuzz external build (#4656)

* Support building fuzzers for projects outside of OSS-Fuzz
* Use retry wrapper
* Fix some tests.

1 files changed, 27 insertions, 0 deletions

diff --git a/infra/test_helpers.py b/infra/test_helpers.py
new file mode 100644
index 000000000..5a9a4d582
--- /dev/null
+++ b/infra/test_helpers.py
@@ -0,0 +1,27 @@
+# Copyright 2020 Google LLC
+#
+# 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.
+"""Contains convenient helpers for writing tests."""
+
+import os
+from unittest import mock
+
+
+def patch_environ(testcase_obj, env=None):
+  """Patch environment."""
+  if env is None:
+    env = {}
+
+  patcher = mock.patch.dict(os.environ, env)
+  testcase_obj.addCleanup(patcher.stop)
+  patcher.start()