[type-safety] Dict[str, Any] defeats type checking in yaml_test_runner.py

[wody34]

📁 Location

• File: tests/python_runners/yaml_test_runner.py:36-52
• Category: type-safety
• Severity: medium
• Hashes: 2597bc4af5e8, 542e22ff34ca

🔍 Problem

Dataclass fields use Dict[str, Any] which disables type checking for dictionary values. This allows invalid configurations to pass silently.

Affected Fields

• ProcessConfig.communication: Dict[str, Any]
• ProcessConfig.execution: Dict[str, Any]
• TestConfig.environment: Dict[str, Any]
• TestConfig.setup: Dict[str, Any]
• TestConfig.validation: Dict[str, Any]
• TestConfig.logging: Dict[str, Any]
• TestConfig.test_matrix: Dict[str, Any]

💡 Fix

from typing import TypedDict, Literal

# Before
@dataclass
class ProcessConfig:
    communication: Dict[str, Any] = field(default_factory=dict)

# After
class CommunicationConfig(TypedDict, total=False):
    port_file: str
    protocol: Literal['mpi', 'file', 'socket']
    timeout: int
    buffer_size: int

@dataclass
class ProcessConfig:
    communication: CommunicationConfig = field(default_factory=dict)

🧪 TDD Evidence

Test file: tests/evidence/test_type_safety_yaml_runner.py

• Demonstrates TypedDict pattern passes mypy --strict
• Documents current broken state with Any

tests/evidence/test_type_safety_yaml_runner.py::TestTypeSafetyYamlRunner::test_process_config_communication_has_typed_dict PASSED
tests/evidence/test_type_safety_yaml_runner.py::TestTypeSafetyYamlRunner::test_test_config_environment_has_typed_dict PASSED

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Run: 2026-02-05-1228 | Auto-generated by UltraQA