| Class | TestRecipientReasonMixin | Test the RecipientReason class. |
| Class | TestRecipientReasonBzr | Test RecipientReason for Bazaar branches. |
| Class | TestRecipientReasonGit | Test RecipientReason for Git references. |
| Class | TestBranchMailerHeadersMixin | Check the headers are correct. |
| Class | TestBranchMailerHeadersBzr | Check the headers are correct for Branch email. |
| Class | TestBranchMailerHeadersGit | Check the headers are correct for GitRef email. |
| Class | TestBranchMailerDiffMixin | Check the diff is an attachment. |
| Class | TestBranchMailerDiffBzr | Check the diff is an attachment for Branch email. |
| Class | TestBranchMailerDiffGit | Check the diff is an attachment for GitRef email. |
| Class | TestBranchMailerSubjectMixin | The subject for a BranchMailer is returned verbatim. |
| Class | TestBranchMailerSubjectBzr | The subject for a BranchMailer is returned verbatim for Branch. |
| Class | TestBranchMailerSubjectGit | The subject for a BranchMailer is returned verbatim for GitRef. |