fix step arguments with default value

src/pytest_bdd/scenario.py

@@ -25,7 +25,7 @@
 from . import exceptions
 from .feature import get_feature, get_features
 from .steps import StepFunctionContext, get_step_fixture_name, inject_fixture
-from .utils import CONFIG_STACK, get_args, get_caller_module_locals, get_caller_module_path
+from .utils import CONFIG_STACK, get_args, get_args_with_default_value, get_caller_module_locals, get_caller_module_path
 
 if TYPE_CHECKING:
     from typing import Any, Iterable
@@ -140,6 +140,7 @@ def _execute_step_function(
     converters = context.converters
     kwargs = {}
     args = get_args(context.step_func)
+    args_with_default = get_args_with_default_value(context.step_func)
 
     try:
         parsed_args = context.parser.parse_arguments(step.name)
@@ -151,7 +152,12 @@ def _execute_step_function(
                 value = converters[arg](value)
             kwargs[arg] = value
 
-        kwargs = {arg: kwargs[arg] if arg in kwargs else request.getfixturevalue(arg) for arg in args}
+        for arg in args:
+            if not arg in kwargs:
+                if not arg in args_with_default:
+                    kwargs[arg] = request.getfixturevalue(arg)
+                else:
+                    kwargs[arg] = args_with_default[arg]
         kw["step_func_args"] = kwargs
 
         request.config.hook.pytest_bdd_before_step_call(**kw)

src/pytest_bdd/utils.py

@@ -33,6 +33,16 @@ def get_args(func: Callable) -> list[str]:
     ]
 
 
+def get_args_with_default_value(func: Callable) -> dict:
+    """Get a dictionary of arguments with default value
+
+    :param func: The function to inspect
+    :return: A dictionary of arguments with default value
+    :rtype: dict"""
+    params = signature(func).parameters.values()
+    return {param.name: param.default for param in params if not param.default == param.empty}
+
+
 def get_caller_module_locals(stacklevel: int = 1) -> dict[str, Any]:
     """Get the caller module locals dictionary.