GitLab

The existing setup does not allow for unit testing the logic
contained for arg parsing. Refactoring the existing setup, such
that we can unit test those components in isolation.

* Encapsulate argument parsing and test runner invocation in a
Runner class.
* Have __main__ create a Runner object, and call main(), which is
the central coordinating method.
test_args
* Unit tests for the argument parsing logic.

Change-Id: I3ca576f99aa7dc36b38579dbce40cd7ac4e67c36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975302
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#729527}