Schemathesis

:version:`3.18.4 <v3.18.3...v3.18.4>` - 2023-02-16
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**Changed**

- Support any Werkzeug 2.x in order to allow mitigation of `CVE-2023-25577 <https://github.com/advisories/GHSA-xg9f-g7g7-2323>`_. :issue:`1695`

:version:`3.18.3 <v3.18.2...v3.18.3>` - 2023-02-12
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**Added**

- ``APIStateMachine.run`` method to simplify running stateful tests.

**Changed**

- Improved quality of generated test sequences by updating state machines in Schemathesis to always run a minimum of two steps during testing. :issue:`1627`
If you use ``hypothesis.stateful.run_state_machine_as_test`` to run your stateful tests, please use the ``run`` method on your state machine class instead.
This change requires upgrading ``Hypothesis`` to at least version ``6.68.1``.

:version:`3.18.2 <v3.18.1...v3.18.2>` - 2023-02-08
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**Performance**

- Modify values in-place inside built-in ``map`` functions as there is no need to copy them.
- Update ``hypothesis-jsonschema`` to ``0.22.1`` for up to 30% faster data generation in some workflows.

:version:`3.18.1 <v3.18.0...v3.18.1>` - 2023-02-06
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**Changed**

- Stateful testing: Only make stateful requests when stateful data is available from another operation.
This change significantly reduces the number of API calls that likely will fail because of absence of stateful data. :issue:`1669`

**Performance**

- Do not merge component schemas into the currently tested schema if they are not referenced by it. Originally all
schemas were merged to make them visible to ``hypothesis-jsonschema``, but they imply significant overhead. :issue:`1180`
- Use a faster, specialized version of ``deepcopy``.

:version:`3.18.0 <v3.17.5...v3.18.0>` - 2023-02-01
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**Added**

- Extra information to VCR cassettes.
- The ``--contrib-unique-data`` CLI option that forces Schemathesis to generate unique test cases only.
This feature is also available as a hook in ``schemathesis.contrib.unique_data``.
- A few decorators & functions that provide a simpler API to extend Schemathesis:
- ``schemathesis.auth()`` for authentication providers;
- ``schemathesis.check`` for checks;
- ``schemathesis.hook`` & ``BaseSchema.hook`` for hooks;
- ``schemathesis.serializer`` for serializers;
- ``schemathesis.target`` for targets;
- ``schemathesis.openapi.format`` for custom OpenAPI formats.
- ``schemathesis.graphql.scalar`` for GraphQL scalars.
- Open API: UUID format generation via the ``schemathesis.contrib.openapi.formats.uuid`` extension
You could enable it via the ``--contrib-openapi-formats-uuid`` CLI option.

**Changed**

- Build: Switch the build backend to `Hatch <https://hatch.pypa.io/>`_.
- Relax requirements for ``attrs``. :issue:`1643`
- Avoid occasional empty lines in cassettes.

**Deprecated**

- ``schemathesis.register_check`` in favor of ``schemathesis.check``.
- ``schemathesis.register_target`` in favor of ``schemathesis.target``.
- ``schemathesis.register_string_format`` in favor of ``schemathesis.openapi.format``.
- ``schemathesis.graphql.register_scalar`` in favor of ``schemathesis.graphql.scalar``.
- ``schemathesis.auth.register`` in favor of ``schemathesis.auth``.

**Fixed**

- Remove recursive references from the last reference resolution level.
It works on the best effort basis and does not cover all possible cases. :issue:`947`
- Invalid cassettes when headers contain characters with a special meaning in YAML.
- Properly display flaky deadline errors.
- Internal error when the ``utf8_bom`` fixup is used for WSGI apps.
- Printing header that are set explicitly via ``get_call_kwargs`` in stateful testing. :issue:`828`
- Display all explicitly defined headers in the generated cURL command.
- Replace ``starlette.testclient.TestClient`` with ``starlette_testclient.TestClient`` to keep compatibility with newer
``starlette`` versions. :issue:`1637`

**Performance**

- Running negative tests filters out less data.
- Schema loading: Try a faster loader first if an HTTP response or a file is expected to be JSON.

:version:`3.17.5 <v3.17.4...v3.17.5>` - 2022-11-08
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**Added**

- Python 3.11 support. :issue:`1632`

**Fixed**

- Allow ``Werkzeug<=2.2.2``. :issue:`1631`