chore: Added contains method to ParameterSet for easier parameter…

… checks in hooks

Ref: #1789

docs/changelog.rst

@@ -14,6 +14,7 @@ Changelog
 - Support for ``body`` hooks in GraphQL schemas, enabling custom filtering or modification of queries and mutations. `#1464`_
 - New ``filter_operations`` hook to conditionally include or exclude specific API operations from being tested.
 - Introduced a new CLI option ``--experimental=openapi-3.1`` for experimental support of OpenAPI 3.1. This enables compatible JSON Schema validation for responses, while data generation remains OpenAPI 3.0-compatible. `#1820`_
+- Added ``contains`` method to ``ParameterSet`` for easier parameter checks in hooks. `#1789`_
 
 **Note**: Experimental features can change or be removed in any minor version release.
 
@@ -3463,6 +3464,7 @@ Deprecated
 .. _#1802: https://github.com/schemathesis/schemathesis/issues/1802
 .. _#1801: https://github.com/schemathesis/schemathesis/issues/1801
 .. _#1797: https://github.com/schemathesis/schemathesis/issues/1797
+.. _#1789: https://github.com/schemathesis/schemathesis/issues/1789
 .. _#1788: https://github.com/schemathesis/schemathesis/issues/1788
 .. _#1781: https://github.com/schemathesis/schemathesis/issues/1781
 .. _#1780: https://github.com/schemathesis/schemathesis/issues/1780

src/schemathesis/parameters.py

@@ -67,6 +67,9 @@ def get(self, name: str) -> Optional[P]:
                 return parameter
         return None
 
+    def contains(self, name: str) -> bool:
+        return self.get(name) is not None
+
     @property
     def example(self) -> Dict[str, Any]:
         """Composite example gathered from individual parameters."""

test/specs/openapi/parameters/test_simple_payloads.py

@@ -1,6 +1,7 @@
 """Tests for behavior not specific to forms."""
 import pytest
 
+import schemathesis
 from schemathesis.parameters import PayloadAlternatives
 from schemathesis.specs.openapi.parameters import OpenAPI20Body, OpenAPI30Body
 
@@ -62,3 +63,12 @@ def test_payload_open_api_3(media_types, assert_parameters, make_openapi_3_schem
         # In this case they are the same
         [user_jsonschema] * len(media_types),
     )
+
+
+def test_parameter_set_get(make_openapi_3_schema):
+    header = {"in": "header", "name": "id", "required": True, "schema": {}}
+    raw_schema = make_openapi_3_schema(parameters=[header])
+    schema = schemathesis.from_dict(raw_schema)
+    headers = schema["/users"]["POST"].headers
+    assert headers.contains("id")
+    assert not headers.contains("foo")