Test cases for Ltwisted.mail.pop3} module.
| Class | UtilityTests | Test the various helper functions and classes used by the POP3 server protocol implementation. | 
| Class | MyVirtualPOP3 | A virtual-domain-supporting POP3 server. | 
| Class | DummyDomain | A virtual domain for a POP3 server. | 
| Class | ListMailbox | A simple in-memory list implementation of IMailbox. | 
| Class | MyPOP3Downloader | A POP3 client which downloads all messages from the server. | 
| Class | POP3Tests | Tests for pop3.POP3. | 
| Class | DummyPOP3 | A simple POP3 server with a hard-coded mailbox for any user. | 
| Class | DummyPOP3Auth | Class to test successful authentication in twisted.mail.pop3.POP3. | 
| Class | DummyMailbox | An in-memory pop3.IMailboximplementation. | 
| Class | AnotherPOP3Tests | Additional pop3.POP3tests. | 
| Class | TestServerFactory | No summary | 
| Class | TestMailbox | An incomplete IMailboximplementation with certain per-user
values hard-coded and known by tests in this module. | 
| Function | contained | Assert that the given capability is included in all of the capability sets. | 
| Class | CapabilityTests | Tests for pop3.POP3's per-user 
capability handling. | 
| Class | GlobalCapabilitiesTests | Tests for pop3.POP3's global 
capability handling. | 
| Class | TestRealm | An IRealmwhich knows about a single test account's mailbox. | 
| Class | SASLTests | Tests for pop3.POP3's SASL 
implementation. | 
| Class | CommandMixin | Tests for all the commands a POP3 server is allowed to receive. | 
| Class | IndexErrorCommandTests | Run all of the command tests against a mailbox which raises IndexError when an out of bounds request is made. This behavior will be deprecated shortly and then removed. | 
| Class | ValueErrorCommandTests | No summary | 
| Class | SyncDeferredMailbox | Mailbox which has a listMessages implementation which returns a Deferred which has already fired. | 
| Class | IndexErrorSyncDeferredCommandTests | Run all of the IndexErrorCommandTeststests with a synchronous-Deferred returning IMailbox implementation. | 
| Class | ValueErrorSyncDeferredCommandTests | Run all of the ValueErrorCommandTeststests with a synchronous-Deferred returning IMailbox implementation. | 
| Class | AsyncDeferredMailbox | Mailbox which has a listMessages implementation which returns a Deferred which has not yet fired. | 
| Class | IndexErrorAsyncDeferredCommandTests | Run all of the IndexErrorCommandTeststests with an asynchronous-Deferred returning IMailbox implementation. | 
| Class | ValueErrorAsyncDeferredCommandTests | Run all of the IndexErrorCommandTeststests with an asynchronous-Deferred returning IMailbox implementation. | 
| Class | POP3MiscTests | Miscellaneous tests more to do with module/package structure than anything to do with the Post Office Protocol. | 
Assert that the given capability is included in all of the capability sets.
| Parameters | testcase | A unittest.TestCaseto use to make assertions. | 
| s | The capability for which to check. (type: bytes) | |
| caps | The capability sets in which to check. (type: tupleof iterable) |