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Blazor Interactive SSR Ad-Hoc Testing

blazor-interactive-ssr-adhoc-testing-playwright-cli

Specialized for ad-hoc testing Blazor web apps in interactive server render mode with SignalR using playwright-cli. Use when performing quick tests on Blazor components, real-time updates, forms, and UI interactions in server-rendered applications.

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SKILL.md

Full skill instructions

Blazor Interactive SSR Ad-Hoc Testing

Extends the playwright-cli skill for exploratory, in-development testing of Blazor apps running in interactive server render mode (interactive SSR) with SignalR. Focus is on quick, manual validation — not CI/​CD automation.

Scope

Covers: ad-hoc E2E workflows, component interaction, SignalR-driven UI updates, form/​validation testing, basic visual and performance checks.

Does not cover: automated test suites (use Playwright Test Framework), unit/​component testing (xUnit/​bUnit), load/​security/​accessibility testing, or production E2E.

Key Considerations for Blazor Server Mode

  • SignalR: Always wait for the WebSocket connection before testing interactions. Check window.Blazor._internal.dotNetObject !== undefined.
  • Async rendering: Elements update asynchronously; use eval to assert DOM state after actions rather than relying on timing.
  • Component lifecycle: Test mounting, updates, and disposal; watch for circuit disconnection errors.
  • Console monitoring: Use playwright-cli console to catch Blazor-specific errors (circuit disconnections, rendering exceptions).

Testing Strategies

Seven strategies cover the common Blazor ad-hoc testing scenarios. Detailed workflows with bash examples are in references/​strategies.md.

#StrategyWhen to use
1Connection and Initial LoadVerify SignalR connects and components render
2Component Interaction and StateTest clicks, server state changes, and UI updates
3Real-Time Data SyncValidate SignalR-pushed data updates in UI
4Form Submission and ValidationTest form fill, submit, success/​error handling
5Error Scenarios and RecoveryTest circuit disconnection and reconnection
6Visual Regression VerificationSnapshot/​DOM checks for unintended visual changes
7Basic Performance AssessmentTracing and responsiveness checks

Read references/​strategies.md for the workflow commands for any strategy above.

Quick Examples

# Verify Blazor and SignalR loaded
playwright-cli open https://localhost:5001
playwright-cli eval "window.Blazor !== undefined"
playwright-cli network

# Click + assert state change
playwright-cli click e5
playwright-cli eval "document.querySelector('.counter-value').textContent.includes('1')"
playwright-cli snapshot

# Form fill and submit
playwright-cli fill e2 "[email protected]"
playwright-cli click e3
playwright-cli eval "document.querySelector('.success-message') !== null"

Best Practices

  • Read references/​strategies.md before starting — pick the strategy that matches your goal.
  • Use eval assertions immediately after interactions to avoid race conditions with SignalR updates.
  • Always run playwright-cli console and playwright-cli network when debugging connection issues.
  • For repeated validations (>3 runs), convert to a proper Playwright test script.
  • Reference the playwright-cli skill for the full command reference and session management.