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Tests for L{twisted.python.fakepwd}.
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L{UserDatabaseTestsMixin} defines tests which apply to any user database
implementation. Subclasses should mix it in, implement C{setUp} to create
C{self.database} bound to a user database instance, and implement
C{getExistingUserInfo} to return information about a user (such information
should be unique per test method).
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I{getpwuid} accepts a uid and returns the user record associated with
it.
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I{getpwuid} raises L{KeyError} when passed a uid which does not exist
in the user database.
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I{getpwnam} accepts a username and returns the user record associated
with it.
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I{getpwnam} raises L{KeyError} when passed a username which does not
exist in the user database.
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The user record returned by I{getpwuid}, I{getpwnam}, and I{getpwall}
has a length.
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The user record returned by I{getpwuid}, I{getpwnam}, and I{getpwall}
is indexable, with successive indexes starting from 0 corresponding to
the values of the C{pw_name}, C{pw_passwd}, C{pw_uid}, C{pw_gid},
C{pw_gecos}, C{pw_dir}, and C{pw_shell} attributes, respectively.
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Tests for L{UserDatabase}.
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Create a L{UserDatabase} with no user data in it.
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Add a new user to C{self.database} and return its information.
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L{UserDatabase.addUser} accepts seven arguments, one for each field of
a L{pwd.struct_passwd}, and makes the new record available via
L{UserDatabase.getpwuid}, L{UserDatabase.getpwnam}, and
L{UserDatabase.getpwall}.
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L{PwdModuleTests} runs the tests defined by L{UserDatabaseTestsMixin}
against the built-in C{pwd} module. This serves to verify that
L{UserDatabase} is really a fake of that API.
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Read and return the next record from C{self._users}, filtering out
any records with previously seen uid values (as these cannot be
found with C{getpwuid} and only cause trouble).
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