schemathesis 4.19.0

Release 4.19.0

on Python PyPI

🚀 Added

• Stateful tests damp reuse of extracted values from unreliable API links.
• Reuse response field values across operations without an inferred producer-consumer link.
• Persist error-feedback, auth, and 405 discoveries to .schemathesis/; probing replays them to skip rediscovery.
• Fuzz dictionaries: sample curated values during generation via [dictionaries.<name>] and [generation.dictionaries]. #2121
• Override body fields via [parameters] with body.<jsonpath> keys.

🏎️ Performance

• Bound hypothesis-jsonschema caches; ~35% lower coverage-phase peak memory on long-running schemas.
• Cache schema generation across operations during the coverage phase.

🐛 Fixed

• Schema loading crash for external $ref paths containing URI-reserved characters (e.g. paths/{id}/op.yaml). #4152
• Out-of-memory in coverage phase on wide, deeply-nested OpenAPI schemas (e.g. AWS Glue, Microsoft Graph).
• Surface a clean schema error for body $ref strings without a / separator.
• Crash when --report-allure-path (or reports.allure.path) cannot be used as a filesystem path.
• RecursionError in coverage phase on multi-branch allOf schemas that canonicalish cannot simplify.
• Restore stateful chain coverage for foreign-key consumers whose target resource is produced by another operation.
• Serialize Swagger 2.0 nested array-of-array query parameters using each level's collectionFormat.
• Emit empty-array negatives for minItems: 1 arrays when items is unsatisfiable.
• Emit string-too-long negatives for maxLength thresholds between 32 KB and 1 MB.
• Emit null variants for optional-nullable properties absent from the body template.
• Cover properties inherited via allOf when a sibling property uses a bundled $ref.
• Emit maxItems negatives for uniqueItems: true arrays whose items.enum domain is exhausted.
• Constrain Swagger 2.0 array query parameters with top-level enum to that domain via items.enum.
• Cover sibling properties when one optional property has a self-contradicting schema.
• Cover array properties when items is declared without type: array.
• Emit maxLength negatives even when the schema's pattern is intrinsically unsatisfiable.
• Emit pattern negatives for header and cookie parameters.
• Runtime Error in negative generation for FastAPI Optional[Enum] query parameters (anyOf with $ref and sibling enum).
• Serialize nested-object multipart form-data parts as JSON instead of Python repr.
• False positive positive_data_acceptance for body schemas with additionalProperties: false inherited via allOf.
• False positive positive_data_acceptance for maxItems: 0 arrays whose items schema is satisfiable.
• False positive positive_data_acceptance for not clauses whose violations breach other outer constraints.
• False positive positive_data_acceptance when a discriminator branch references a polymorphic schema.
• False positive positive_data_acceptance when sibling oneOf/anyOf constraints reference bundled $ref schemas.