Update & complete benchmark_run_unittest.py

Add tests for all the methods in BenchmarkRun.

BUG=Non
TEST=Ran unittest.

Change-Id: I9046f010ce0e48ba8d897585fec2f95732df9cd3
Reviewed-on: https://chrome-internal-review.googlesource.com/162988
Reviewed-by: Yunlian Jiang <yunlian@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
2 files changed