# Default filter: `__test__`

This plugin implements `startTestRun()`, which excludes all test objects that define a `__test__` attribute that evaluates to `False`.

## Plugin class reference: DunderTestFilter

class nose2.plugins.dundertest.DunderTestFilter(*args, **kwargs)

  Exclude all tests defining a `__test__` attribute that evaluates to `False`.

  startTestRun(event)

    Recurse `event.suite` and remove all test suites and test cases that define a `__test__` attribute that evaluates to `False`.