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Tests for miscellaneous behaviors of the top-level L{twisted} package (ie, for
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    Take a mapping defining a package and turn it into real C{ModuleType}
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        c = {"twisted": {"plugin": {"getPlugins": stub}}}

    C{_install(a)} will place an item into C{sys.modules} with C{"foo"} as the
    key and C{"bar" as the value.

    C{_install(b)} will place an item into C{sys.modules} with C{"twisted"} as
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    @param modules: A mapping from names to definitions of modules.  The names
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        arbitrary objects.  Any value which is not a dictionary will be added to
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    Construct module objects (for either modules or packages).

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    @param attributes: A mapping giving the attributes of the particular module
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    @param result: A mapping which is populated with all created module names.
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    Tests for L{_makePackages}, a helper for populating C{sys.modules} with
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