Conformance tests

Purpose

mxr-provider-fake exports conformance helpers so adapter authors can verify that a provider satisfies the mxr trait contract before wiring it into the daemon.

Sync conformance

use mxr_provider_fake::conformance;

conformance::run_sync_conformance(&provider).await;

The sync checks validate:

• sync_labels returns usable labels
• Initial sync returns messages with bodies
• Cursors advance
• Attachments can be fetched when present
• Mutation methods succeed
• Label management works when label support is advertised

Send conformance

use mxr_provider_fake::conformance;

conformance::run_send_conformance(&provider).await;

The send checks validate:

• Sending returns a receipt
• Timestamps are sane
• Draft save does not fail

Canonical fixtures

mxr-provider-fake::fixtures also exports:

• Canonical fixture dataset
• Sample draft
• Sample from-address

Use those to build provider-specific tests around your adapter.

Package conformance

Some mxr behavior now comes from standalone public crates. Their conformance tests live with the package repo, not inside the adapter suite. The package repo is the source of truth for the portable contract; mxr owns only the local execution policy around that contract.

Behavior	Package	Source repo	mxr consumer
RFC 5256 / JWZ threading	mail-threading	planetaryescape/mail-threading	mxr-sync
RFC 2369 / RFC 8058 unsubscribe headers	list-unsubscribe	planetaryescape/list-unsubscribe	mxr-mail-parse
Gmail-style search parser and AST	mail-query	planetaryescape/mail-query	mxr-search
mbox and Maildir formats	mailbox-formats	planetaryescape/mailbox-formats	mxr-export

Check which package backs a local behavior:

cargo tree -p mxr-sync -i mail-threading
cargo tree -p mxr-mail-parse -i list-unsubscribe
cargo tree -p mxr-search -i mail-query
cargo tree -p mxr-export -i mailbox-formats

Use the package repos for their portable JSON fixtures and coverage matrices. Use mxr-provider-fake::conformance for provider adapter behavior.