TestCase.run_bzr loads plugins by default

[Jonathan Lange]

run_bzr loads plugins by default. This makes the test run dependent on local developer environment settings. We should disable loading plugins in the test suite.

[Andrew Bennetts (spiv)]

I think this is arguably also a bug in Bazaar; it makes it unnecessarily difficult for projects other than bzr to make a robust test suite that uses bzrlib.tests.TestCase. It's easy to use for a project to use bzrlib.tests.TestCase without realising this would be an issue.

[Martin Pool (mbp)]

I agree it's a bug.

[Robert Collins (lifeless)]

I think it would be spurious for run_bzr to *not* load plugins by
default, it would be being different for difference sake.

IMO run_bzr should honour --no-plugins for folk writing tests that care
- but the vast bulk of tests should work with plugins loaded or not.

Perhaps the command line should parameterise this though, so with
--no-plugins, run_bzr won't load plugins, otherwise it will.

As a library user the default would then be the same as bzrlib's loading
of plugins - e.g. off.

-Rob
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[Jonathan Lange (jml)]

Not actually a bug in Launchpad Bazaar.