TestRequestInit
type TestRequestInit = unknownInit options accepted by a test handle’s fetch(target, init).
The body is unknown and is JSON-serialized
automatically unless already raw bytes; the integration harness assumes JSON for
convenience, in contrast to the unit-level MockContextOpts.body which is
raw bytes only.
Pass signal to test handlers that observe request cancellation via
ctx.req.signal; aborting the signal mid-fetch propagates to the handler.
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