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test(python/svm): add unit tests for ExactSvmSchemeV1 facilitator #152

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test(python/svm): add unit tests for ExactSvmSchemeV1 facilitator #152

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1 change: 1 addition & 0 deletions python/x402/changelog.d/python-svm-exact-v1-facilitator-tests.doc.md
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Add 41 unit tests for `mechanisms/svm/exact/v1/facilitator.py` — the only SVM V1 source file without dedicated coverage after PR #151 landed `test_exact_v1_client.py`. `test_facilitator.py` covers `ExactSvmFacilitatorScheme` (V2) and only borrows `ExactSvmSchemeV1` for one shared-cache cross-version case; the V1 verify/settle pipelines themselves had no direct coverage. New `test_exact_v1_facilitator.py` covers: constructor + scheme/`caip_family` attributes + default-vs-injected `SettlementCache`; `get_extra` / `get_signers` (multi-address selection, fresh-list return); V1 top-level `scheme` and `network` mismatch gates; `feePayer` extra missing/`None`/non-string/unmanaged paths; transaction decode failures (invalid base64, empty payload); a happy-path verify against a real V1 transaction built via `ExactSvmClientV1` with mocked RPC, plus V1-specific `max_amount_required` exact/below thresholds, mint mismatch, recipient ATA mismatch, `fee_payer_transferring_funds` safety, memo-extra match/mismatch, simulation-failure surfacing the underlying message, and sign-failure-during-verify mapping to `transaction_simulation_failed`; compute-budget price-cap gate via `MAX_COMPUTE_UNIT_PRICE_MICROLAMPORTS` patching; settle short-circuit on verify failure (network reported from payload), happy-path returning `mockSignature123` with `send_transaction` + `confirm_transaction` call ordering, send/confirm/missing-feePayer error paths surfacing `transaction_failed`, fee-payer propagation into `sign_transaction`, duplicate-settlement cache (same-instance + cross-instance shared-cache), and a helper round-trip smoke test ensuring the V1 client output decodes to the 3–6 instruction range the facilitator accepts.
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