PASS: serving cert carries Basic Constraints CA:TRUE (mimics Proton Bridge)
=== generate himalaya.toml + msmtprc via integration_proton._build_config ===
GENERATED himalaya.toml + msmtprc
=== generated config: integration pins backend.encryption.cert + tls_trust_file ===
PASS: generated himalaya config pins backend.encryption.cert at the Bridge cert
PASS: generated msmtprc carries tls_trust_file at the Bridge cert
=== IMAP positive: himalaya trusts the CA:TRUE cert via the integration's pin ===
PASS: himalaya completed TLS against the CA:TRUE cert (integration pin works)
PASS: no CaUsedAsEndEntity / cert error from himalaya when pinned
=== IMAP negative: strip the integration's pin -> default verifier rejects CA:TRUE ===
PASS: without the pin himalaya rejects the CA:TRUE cert (the hazard is real)
=== SMTP positive: msmtp trusts the CA:TRUE cert via the integration's tls_trust_file ===
PASS: msmtp trusted the CA:TRUE cert via tls_trust_file (no cert error)
=== SMTP negative: point trust_file at an unrelated cert -> msmtp must reject ===
PASS: msmtp rejected the mismatched cert (trust_file is enforced)

RESULT: ALL-PASS