Inbox Isolation Is Key to Reliable Facebook Signup API Testing

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A software developer has highlighted a recurring flaw in testing Facebook-based signup flows, where shared email inboxes cause tests to appear successful even when the current API run has failed. The core issue arises when verification emails from previous test runs are mistakenly used to satisfy checks for new requests, masking real failures. The developer argues that the inbox should be treated as part of the API contract, with each test run using a dedicated, time-bounded mailbox tied to a unique run identifier. Common failure modes include shared inboxes storing messages across multiple runs, async email workers lagging behind API responses, and verification tokens belonging to stale requests. The recommended pattern involves creating a fresh mailbox per test run, attaching a run ID to the signup payload, and rejecting any email that does not carry the expected run marker.

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