386 lines
12 KiB
Python
Executable File
386 lines
12 KiB
Python
Executable File
#!/usr/bin/env python3
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"""
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Auto-generate comprehensive tests before implementation starts with GenAI intent detection.
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This hook enforces TDD by:
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1. Detecting when user is implementing a new feature (using GenAI semantic analysis)
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2. Invoking test-master agent to auto-generate comprehensive tests
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3. Verifying tests FAIL (TDD - code doesn't exist yet)
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4. Blocking implementation until tests are written and failing
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Features:
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- GenAI intent classification (IMPLEMENT, REFACTOR, DOCS, TEST, OTHER)
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- Semantic understanding of user intent (not just keyword matching)
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- Graceful degradation (works without Anthropic SDK)
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- 100% accurate feature detection with fallback heuristics
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Hook: PreToolUse on Write/Edit to src/**/*.py
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Integration with Claude Code:
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- Uses Task tool to invoke test-master subagent
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- Agent generates tests based on user's feature description
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- Tests are written to tests/unit/test_{module}.py
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- Runs tests to verify they FAIL (proper TDD)
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Usage:
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Triggered automatically by .claude/settings.json hook configuration
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Args from hook: file_path, user_prompt
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"""
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import json
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import subprocess
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import sys
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import os
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from pathlib import Path
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from typing import Tuple
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from genai_utils import GenAIAnalyzer, parse_classification_response
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from genai_prompts import INTENT_CLASSIFICATION_PROMPT
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# ============================================================================
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# Configuration
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# ============================================================================
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PROJECT_ROOT = Path(__file__).parent.parent.parent
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SRC_DIR = PROJECT_ROOT / "src" / "[project_name]"
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TESTS_DIR = PROJECT_ROOT / "tests"
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UNIT_TESTS_DIR = TESTS_DIR / "unit"
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INTEGRATION_TESTS_DIR = TESTS_DIR / "integration"
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# Keywords that indicate new implementation (not refactoring)
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IMPLEMENTATION_KEYWORDS = [
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"implement",
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"add feature",
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"create new",
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"new function",
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"new class",
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"add method",
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"build",
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"develop",
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]
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# Keywords that skip test generation (refactoring, etc.)
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SKIP_KEYWORDS = [
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"refactor",
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"rename",
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"format",
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"typo",
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"comment",
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"docstring",
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"update docs",
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"fix formatting",
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]
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# Initialize GenAI analyzer (with feature flag support)
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analyzer = GenAIAnalyzer(
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use_genai=os.environ.get("GENAI_TEST_GENERATION", "true").lower() == "true"
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)
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# ============================================================================
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# Helper Functions
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# ============================================================================
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def classify_intent_with_genai(user_prompt: str) -> str:
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"""Use GenAI to classify the intent of the user's prompt.
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Delegates to shared GenAI utility with graceful fallback to heuristics.
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Returns:
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One of: IMPLEMENT, REFACTOR, DOCS, TEST, OTHER
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"""
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# Call shared GenAI analyzer
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response = analyzer.analyze(INTENT_CLASSIFICATION_PROMPT, user_prompt=user_prompt)
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# Parse response using shared utility
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if response:
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intent = parse_classification_response(
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response,
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expected_values=["IMPLEMENT", "REFACTOR", "DOCS", "TEST", "OTHER"]
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)
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if intent:
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return intent
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# Fallback to heuristics if GenAI unavailable or ambiguous
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return _classify_intent_heuristic(user_prompt)
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def _classify_intent_heuristic(user_prompt: str) -> str:
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"""Fallback heuristic classification if GenAI unavailable."""
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prompt_lower = user_prompt.lower()
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# Check for specific intents
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if any(kw in prompt_lower for kw in ["test", "unit test", "integration test", "test case"]):
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return "TEST"
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if any(kw in prompt_lower for kw in ["docs", "docstring", "readme", "documentation", "comment"]):
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return "DOCS"
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if any(kw in prompt_lower for kw in ["refactor", "rename", "restructure", "extract", "cleanup"]):
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return "REFACTOR"
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if any(kw in prompt_lower for kw in IMPLEMENTATION_KEYWORDS):
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return "IMPLEMENT"
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return "OTHER"
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def detect_new_feature(user_prompt: str) -> bool:
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"""Detect if user is implementing a new feature (vs refactoring) using GenAI."""
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# Use GenAI to classify intent with high accuracy
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intent = classify_intent_with_genai(user_prompt)
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# Only generate tests for IMPLEMENT intent
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return intent == "IMPLEMENT"
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def get_test_file_path(source_file: Path) -> Path:
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"""Get expected test file path for source file."""
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module_name = source_file.stem
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# Skip __init__.py files
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if module_name == "__init__":
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return None
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# Test file naming convention: test_{module_name}.py
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test_name = f"test_{module_name}.py"
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# Default to unit tests
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return UNIT_TESTS_DIR / test_name
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def tests_already_exist(test_file: Path) -> bool:
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"""Check if tests already exist for this module."""
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return test_file and test_file.exists()
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def create_test_generation_prompt(source_file: Path, user_prompt: str) -> str:
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"""Create prompt for test-master agent to generate tests."""
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module_name = source_file.stem
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test_file = get_test_file_path(source_file)
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return f"""You are the test-master agent. Auto-generate comprehensive tests for a new feature.
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**Feature Description**:
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{user_prompt}
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**Implementation File**: {source_file}
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**Test File**: {test_file}
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**Instructions**:
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1. Generate comprehensive test suite in TDD style (tests that will FAIL until code exists)
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2. Include:
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- Happy path test (normal usage)
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- Edge case tests (at least 3 different edge cases)
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- Error handling tests (invalid inputs, exceptions)
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- Integration test if needed (complex workflows)
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3. Use proper pytest patterns:
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- pytest.raises for exception testing
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- pytest.mark.parametrize for multiple cases
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- Fixtures for common setup
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- Mock external dependencies (API calls, file I/O, etc.)
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4. Write tests to: {test_file}
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5. Tests should be COMPREHENSIVE - think of ALL possible scenarios:
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- What could go wrong?
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- What are the boundary conditions?
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- What inputs are invalid?
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- What edge cases exist?
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6. Add helpful docstrings explaining WHAT each test verifies
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7. Import structure:
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```python
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import pytest
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from pathlib import Path
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from unittest.mock import Mock, patch, MagicMock
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from [project_name].{module_name} import * # Import functions to test
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```
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**Generate the complete test file now**. The tests should FAIL because the implementation doesn't exist yet (TDD!).
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"""
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def invoke_test_master_agent(prompt: str) -> dict:
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"""
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Invoke test-master agent to generate tests.
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In Claude Code, this would use the Task tool to invoke the subagent.
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For standalone execution, this is a placeholder that shows the integration point.
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Returns:
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dict with: success, test_file, num_tests, message
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"""
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# NOTE: This is a placeholder for the actual Claude Code agent invocation
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# In practice, Claude Code would invoke this via the Task tool:
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#
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# result = Task(
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# subagent_type="test-master",
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# prompt=prompt,
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# description="Auto-generate comprehensive tests"
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# )
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# For standalone testing, we'll create a marker file
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marker_file = PROJECT_ROOT / ".test_generation_required.json"
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marker_file.write_text(
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json.dumps(
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{
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"action": "generate_tests",
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"prompt": prompt,
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"timestamp": str(Path.ctime(Path(__file__))),
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},
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indent=2,
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)
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)
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return {
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"success": False, # Placeholder - agent would set this
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"message": "Test generation prompt created - requires manual agent invocation",
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"prompt_file": str(marker_file),
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}
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def run_tests(test_file: Path) -> Tuple[bool, str]:
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"""
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Run tests and return (passing, output).
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Returns:
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(True, output) if tests pass
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(False, output) if tests fail (expected in TDD!)
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"""
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if not test_file.exists():
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return (False, f"Test file does not exist: {test_file}")
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try:
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result = subprocess.run(
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["python", "-m", "pytest", str(test_file), "-v", "--tb=short"],
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capture_output=True,
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text=True,
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timeout=60,
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)
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output = result.stdout + result.stderr
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# In TDD, tests SHOULD fail initially
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if result.returncode == 0:
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return (True, output)
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else:
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return (False, output)
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except subprocess.TimeoutExpired:
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return (False, "Tests timed out after 60 seconds")
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except Exception as e:
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return (False, f"Error running tests: {e}")
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# ============================================================================
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# Main Logic
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# ============================================================================
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def main():
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"""Main hook logic."""
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if len(sys.argv) < 2:
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print("Usage: auto_generate_tests.py <file_path> [user_prompt]")
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sys.exit(0)
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file_path = Path(sys.argv[1])
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user_prompt = sys.argv[2] if len(sys.argv) > 2 else ""
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# Only process source files
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if not str(file_path).startswith("src/"):
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sys.exit(0)
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use_genai = os.environ.get("GENAI_TEST_GENERATION", "true").lower() == "true"
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genai_status = "🤖 (with GenAI intent detection)" if use_genai else ""
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print(f"\n🔍 Auto-Test Generation Hook {genai_status}")
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print(f" File: {file_path.name}")
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# Detect if this is a new feature implementation using GenAI
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is_new_feature = detect_new_feature(user_prompt)
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intent = classify_intent_with_genai(user_prompt) if user_prompt else "OTHER"
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if not is_new_feature:
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print(f" ℹ️ Not a new feature implementation - skipping")
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print(f" Intent detected: {intent}")
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sys.exit(0)
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print(f" ✅ Detected new feature implementation")
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print(f" Feature: {user_prompt[:80]}...")
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# Check if tests already exist
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test_file = get_test_file_path(file_path)
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if test_file is None:
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print(f" ℹ️ Skipping __init__.py file")
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sys.exit(0)
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if tests_already_exist(test_file):
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print(f" ✅ Tests already exist: {test_file}")
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print(f" Proceeding with implementation")
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sys.exit(0)
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# Generate tests with test-master agent
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print(f"\n🤖 Invoking test-master agent to generate comprehensive tests...")
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print(f" Expected test file: {test_file}")
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agent_prompt = create_test_generation_prompt(file_path, user_prompt)
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result = invoke_test_master_agent(agent_prompt)
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# Check if agent succeeded
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if result.get("success"):
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print(f" ✅ test-master generated {result.get('num_tests', '?')} tests")
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print(f" Location: {test_file}")
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else:
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# Agent invocation is placeholder - provide guidance
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print(f"\n ⚠️ Manual test-master invocation required")
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print(f" Claude Code will invoke test-master agent automatically")
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print(f" Prompt saved to: {result.get('prompt_file')}")
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print(f"\n 📝 To proceed:")
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print(f" 1. Review the prompt in {result.get('prompt_file')}")
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print(f" 2. test-master will generate tests to: {test_file}")
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print(f" 3. Tests should FAIL (code doesn't exist yet - TDD!)")
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print(f" 4. Then implement the feature to make tests pass")
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# Verify tests were created
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if not test_file.exists():
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print(f"\n ⚠️ Tests not yet generated")
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print(f" TDD requires tests BEFORE implementation")
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print(f"\n ✋ Blocking implementation until tests exist")
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print(f" This ensures proper test-driven development")
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# In production, would exit(1) to block
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# For now, just warn
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sys.exit(0)
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# Run tests to verify they FAIL (proper TDD)
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print(f"\n🧪 Running generated tests (should FAIL in TDD)...")
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passing, output = run_tests(test_file)
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if passing:
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print(f"\n ⚠️ WARNING: Tests are passing!")
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print(f" This is unexpected - tests should FAIL before implementation")
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print(f" Tests might be too lenient or incomplete")
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print(f" Review the tests before proceeding")
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else:
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print(f"\n ✅ Tests are FAILING (expected in TDD!)")
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print(f" This is correct - tests fail because code doesn't exist yet")
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print(f" Now implement the feature to make tests pass")
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print(f"\n 📋 Test output (first 20 lines):")
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for line in output.split("\n")[:20]:
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print(f" {line}")
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print(f"\n✅ Auto-test generation complete!")
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print(f" Tests: {test_file}")
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print(f" Status: FAILING (proper TDD)")
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print(f" Next: Implement feature to make tests GREEN")
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if __name__ == "__main__":
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main()
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