testEnvelope

Builds an Envelope with exactly the field values you ask for, for tests that need to assert on a known envelope rather than whatever a real tracker happens to stamp.

Every parameter defaults, so a test names only the fields it asserts on:

val envelope = testEnvelope(seq = 7, sessionId = "sess-1")

The production path is EnvelopeSource.stamp — the tracker owns event-id uniqueness, session rotation, and sequence monotonicity, and an envelope assembled by hand has none of them. That is why Envelope's own constructor is internal, and why this factory lives in autograph-test, which carries no ABI guarantee and may therefore gain parameters as the envelope grows.

To test stamping itself, build a real tracker over an InMemoryTestTransport and InMemorySeqStore instead; this factory deliberately proves nothing about the stamper.