50-01-video-based-nhitl-testing

Testing & Quality

Visual verification loop combining Playwright video recording with video-explorer frame extraction for autonomous behavior debugging.

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50.01 Video-Based NHITL Testing

Problem

E2E tests check state labels (e.g., action === 'Engage') but not actual behaviors (e.g., projectiles fired, damage dealt). A test can "pass" while the feature is completely broken.

Solution: Visual Verification Loop

Combine Playwright video recording with video-explorer frame extraction to enable you to visually debug test failures without human involvement.

Flow

1. Run E2E test with video recording enabled
2. Test completes (pass or fail)
3. Extract frames from test-results/*.webm using video-explorer
4. You analyze frames visually:
   - "Frame 00:03: Label shows 'Engage'"
   - "Frame 00:03-00:08: No projectiles visible"
   - "Diagnosis: Engage state set but weapon not firing"
5. Fix the actual issue (not just make test pass)
6. Re-run and verify visually

Configuration

// playwright.config.ts
use: {
  video: 'on',  // Record ALL tests, not just failures
}

Video Analysis Commands

# Overview of test video
videx overview test-results/<test-name>/video.webm 1 480

# Zoom into specific moment
videx range test-results/<test-name>/video.webm 0:03-0:08 --fps=5

# Single frame detail
videx zoom test-results/<test-name>/video.webm 0:05

What to Look For

Adapt this table to your project's visual indicators:

Behavior	Visual Indicator
Action triggered	UI element changes state
Animation playing	Sprite/element visible in frames
State transition	Labels/overlays change
Error state	Error UI appears

Benefits

True behavior verification - see what actually happens, not just state changes
NHITL debugging - You watch the video, find problems autonomously
Evidence-based fixes - know exactly what's broken before coding
Regression detection - visual diff between expected and actual behavior