Visual Testing Diagnostic Report

Failure Analysis: Playwright Target Closure

Observed Symptoms

• 0 pages successfully captured
• Multiple TargetClosedError exceptions
• Consistent browser context and page creation failures

Potential Root Causes

1. Browser Resource Exhaustion
2. Possible memory leaks in browser context management
3. Insufficient resource cleanup between page captures

4. Concurrent browser context creation overwhelming system resources

5. Network and Server Instability

6. Local documentation server might be unstable
7. Inconsistent network response times

8. Timeout configuration not aligned with server performance

9. Playwright Configuration Issues

10. Suboptimal browser launch parameters
11. Aggressive network request blocking
12. Insufficient error recovery mechanisms

Diagnostic Recommendations

1. Browser Context Management

# Implement more robust context and page lifecycle management
async def create_browser_context(browser):
    try:
        context = await browser.new_context(
            viewport={"width": 1280, "height": 720},
            # Add additional context options for stability
            accept_downloads=False,
            bypass_csp=True,
            # Implement strict timeout controls
            timeout=10000  # 10-second global timeout
        )
        return context
    except Exception as e:
        console.print(f"❌ Browser context creation failed: {e}")
        return None

2. Enhanced Error Handling

async def safe_page_capture(browser, path, name):
    max_retries = 3
    for attempt in range(max_retries):
        context = None
        page = None
        try:
            context = await create_browser_context(browser)
            if not context:
                continue

            page = await context.new_page()

            # Implement more granular timeout and error tracking
            await page.goto(path, timeout=15000, wait_until='networkidle')

            # Capture logic here

        except Exception as e:
            console.print(f"Capture attempt {attempt + 1} failed: {e}")
        finally:
            # Guaranteed cleanup
            if page:
                await page.close()
            if context:
                await context.close()

Configuration Tuning

1. Timeout Strategy
2. Implement exponential backoff
3. Use adaptive timeout calculation

4. Add jitter to prevent synchronized retry attempts

5. Resource Management

6. Limit concurrent browser contexts
7. Implement a connection pool
8. Add explicit resource release mechanisms

Logging and Monitoring

class VisualTestMonitor:
    def __init__(self):
        self.capture_attempts = 0
        self.successful_captures = 0
        self.failed_captures = 0
        self.error_log = []

    def log_capture_attempt(self, success: bool, error: Optional[str] = None):
        self.capture_attempts += 1
        if success:
            self.successful_captures += 1
        else:
            self.failed_captures += 1
            if error:
                self.error_log.append(error)

Next Investigation Steps

1. Verify local documentation server stability
2. Profile memory and CPU usage during test runs
3. Analyze network request patterns
4. Review Playwright and browser configuration

Potential Quick Fixes

• Reduce page capture concurrency
• Increase global and per-page timeouts
• Implement more aggressive error recovery
• Add detailed logging for each capture attempt

Conclusion

The current visual testing infrastructure requires significant refactoring to improve reliability and performance. The primary focus should be on robust error handling, resource management, and adaptive retry mechanisms.