fix: Add validation for empty ParameterString value in start local pipeline

src/sagemaker/local/entities.py

@@ -845,6 +845,12 @@ def _initialize_and_validate_parameters(self, overridden_parameters):
                         "{}.".format(param_name, parameter_type.python_type, type(param_value))
                     )
                     raise ClientError(error_msg, "start_pipeline_execution")
+                if param_value == "":
+                    error_msg = self._construct_validation_exception_message(
+                        'Parameter {} value "" is too short (length: 0, '
+                        "required minimum: 1).".format(param_name)
+                    )
+                    raise ClientError(error_msg, "start_pipeline_execution")
                 merged_parameters[param_name] = param_value
         for param_name, default_parameter in default_parameters.items():
             if param_name not in merged_parameters:

tests/integ/test_local_mode.py

@@ -908,6 +908,7 @@ def else_step():
             assert exe_step_result["Metadata"]["Condition"]["Outcome"] is True
 
 
+@pytest.mark.local_mode
 def test_local_pipeline_with_step_decorator_data_referenced_by_other_steps(
     local_pipeline_session,
     dummy_container,
@@ -987,6 +988,7 @@ def func(var: int):
             assert exe_step_result["Metadata"]["Condition"]["Outcome"] is True
 
 
+@pytest.mark.local_mode
 def test_local_remote_function_with_additional_dependencies(
     local_pipeline_session, dummy_container
 ):

tests/unit/sagemaker/local/test_local_entities.py

@@ -20,6 +20,7 @@
 from botocore.exceptions import ClientError
 
 import sagemaker.local
+from sagemaker.workflow.fail_step import FailStep
 from sagemaker.workflow.parameters import ParameterString
 from sagemaker.workflow.pipeline import Pipeline
 from sagemaker.workflow.lambda_step import LambdaStep
@@ -293,3 +294,28 @@ def test_start_local_pipeline_with_wrong_parameter_type(sagemaker_local_session)
         f"Unexpected type for parameter '{parameter.name}'. Expected "
         f"{parameter.parameter_type.python_type} but found {type(True)}." in str(error.value)
     )
+
+
+def test_start_local_pipeline_with_empty_parameter_string_value(
+    local_pipeline_session,
+):
+    param_str_name = "MyParameterString"
+    param_str = ParameterString(name=param_str_name, default_value="default")
+    fail_step = FailStep(
+        name="MyFailStep",
+        error_message=param_str,
+    )
+
+    pipeline = Pipeline(
+        name="MyPipeline",
+        steps=[fail_step],
+        sagemaker_session=local_pipeline_session,
+        parameters=[param_str],
+    )
+
+    local_pipeline = sagemaker.local.entities._LocalPipeline(pipeline)
+    with pytest.raises(ClientError) as error:
+        local_pipeline.start(PipelineParameters={param_str_name: ""})
+    assert (
+        f'Parameter {param_str_name} value "" is too short (length: 0, required minimum: 1).'
+    ) in str(error)