I had been running all the unit tests for DVCS-related changes with the

reviewboard.diffviewer.features.dvcs_feature enabled view

settings_local.py. This had the side effect of enabling the feature

for unit tests that required the feature to be enabled, but as soon as

the feature was disabled those unit tests would fail. Those unit tests

now have proper feature overrides when they are making API calls.

Ran the unit tests with the DVCS feature disabled.