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Tests for twisted.internet.glibbase.
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L{ensureNotImported} protects against unwanted past and future imports.
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If the specified modules have never been imported, and import
prevention is requested, L{ensureNotImported} makes sure they will not
be imported in the future.
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If the specified modules have never been imported, and import
prevention is not requested, L{ensureNotImported} has no effect.
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If the specified modules have been set to L{None} in C{sys.modules},
L{ensureNotImported} does not complain.
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If one of the specified modules has been previously imported,
L{ensureNotImported} raises an exception.
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