Ability to pass parameters directly

[Stranger6667]

When testing some endpoint that implies having some id in the path or any other part:

/api/items/{item_id}

It will be helpful to put real item_id into parameters if it is known before the test:

@schema.parametrize(path_parameters={"item_id": 42})
def test_items(case):
    case.path_parameters  # {"item_id": 42}

Under the hood, these parameters could be passed as st.just into the case strategy, be available in the case fixture.

Goals:

• Improve the usefulness of generated test cases. Some endpoints require pre-defined parameters to work (otherwise it could be almost always 404 or similar);
• Improve performance, since just is faster than from_schema (though in some cases it could be slower)

Alternative - all parameters are named (kinda, since requestBody is a separate one), we can pass the something like this to parametrize:

@schema.parametrize(overrides={"item_id": st.just(42)})
def test_items(case):
    ...

In this case, the data generation is more flexible - we can generate whatever we need with Hypothesis strategies

Implementation notes:

• Check if the parameter name is valid and exists in the schema
• During Open API -> JSON Schema translation do not include parameters, that are in the "overrides" dictionary
• Create a dynamic st.composite strategy that draws from the reduced schema first and then draws from the provided strategies.