def METHOD_NAME(self):
    account1 = _AccountTestClass(address='foo@example.com')
    account2 = _AccountTestClass(address='to@example.com',
                                 alias_regexp=r'to\+.*@example.com')
    account3 = _AccountTestClass(address='bar@example.com')
    mailstring = self.mailstring.replace('to@example.com',
                                         'to+some_tag@example.com')
    mail = email.message_from_string(mailstring)
    expected = ('to+some_tag@example.com', account2)
    self._test(accounts=[account1, account2, account3], expected=expected,
               mail=mail)