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Tests for miscellaneous behaviors of the top-level L{twisted} package (ie, for
the code in C{twisted/__init__.py}.
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L{SetAsideModule} is a context manager for temporarily removing a module
from C{sys.modules}.
@ivar name: The name of the module to remove.
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Find the given module and all of its hierarchically inferior modules in
C{sys.modules}, remove them from it, and return whatever was found.
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Take a mapping defining a package and turn it into real C{ModuleType}
instances in C{sys.modules}.
Consider these example::
a = {"foo": "bar"}
b = {"twisted": {"__version__": "42.6"}}
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
the key. The value will be a new module object. The module will have a
C{"__version__"} attribute with C{"42.6"} as the value.
C{_install(c)} will place an item into C{sys.modules} with C{"twisted"} as
the key. The value will be a new module object with a C{"plugin"}
attribute. An item will also be placed into C{sys.modules} with the key
C{"twisted.plugin"} which refers to that module object. That module will
have an attribute C{"getPlugins"} with a value of C{stub}.
@param modules: A mapping from names to definitions of modules. The names
are native strings like C{"twisted"} or C{"unittest"}. Values may be
arbitrary objects. Any value which is not a dictionary will be added to
C{sys.modules} unmodified. Any dictionary value indicates the value is
a new module and its items define the attributes of that module. The
definition of this structure is recursive, so a value in the dictionary
may be a dictionary to trigger another level of processing.
@return: L{None}
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Construct module objects (for either modules or packages).
@param parent: L{None} or a module object which is the Python package
containing all of the modules being created by this function call. Its
name will be prepended to the name of all created modules.
@param attributes: A mapping giving the attributes of the particular module
object this call is creating.
@param result: A mapping which is populated with all created module names.
This is suitable for use in updating C{sys.modules}.
@return: A mapping of all of the attributes created by this call. This is
suitable for populating the dictionary of C{parent}.
@see: L{_install}.
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Tests for L{_makePackages}, a helper for populating C{sys.modules} with
fictional modules.
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A non-C{dict} value in the attributes dictionary passed to L{_makePackages}
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the items of that C{dict} value.
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Processing of the attributes dictionary is recursive, so a C{dict} value
it contains may itself contain a C{dict} value to the same effect.
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