web-renderer-test

Name: web-renderer-test - Agent Skill
Rating: 5.0 (27440 reviews)
Author: remotion-dev

27,440

Add a test case to the web renderer

Download Folder View on GitHub

CLI Install

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Method 1 - skills CLI

npx skills i remotion-dev/remotion/.claude/skills/web-renderer-test

Method 2 - openskills (supports sync & update)

npx openskills install remotion-dev/remotion

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Installation Path

Download and extract to one of the following locations:

~/.claude/skills/web-renderer-test/

SKILL.md

Skill Instructions

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Claude Sonnet 4.5

$0.20/task

Best for coding tasks

No setup required

The web renderer is in packages/web-renderer and the test suite is in packages/web-renderer/src/test.

It uses visual snapshot testing using vitest. A test file can for example be executed using:

bunx vitest src/test/video.test.tsx

Example

Each test is powered by a fixture in packages/web-renderer/src/test/fixtures. A fixture looks like this for example:

import {AbsoluteFill} from 'remotion';
 
const Component: React.FC = () => {
  return (
    <AbsoluteFill
      style={{
        justifyContent: 'center',
        alignItems: 'center',
      }}
    >
      <div
        style={{
          backgroundColor: 'red',
          width: 100,
          height: 100,
          borderRadius: 20,
        }}
      />
    </AbsoluteFill>
  );
};
 
export const backgroundColor = {
  component: Component,
  id: 'background-color',
  width: 200,
  height: 200,
  fps: 25,
  durationInFrames: 1,
} as const;

The corresponding test looks like this:

import {test} from 'vitest';
import {renderStillOnWeb} from '../render-still-on-web';
import {backgroundColor} from './fixtures/background-color';
import {testImage} from './utils';
 
test('should render background-color', async () => {
  const blob =

Adding a new test

Add a new fixture in packages/web-renderer/src/test/fixtures.
Important: Add the fixture to packages/web-renderer/src/test/Root.tsx to add a way to preview it.
Add a new test in packages/web-renderer/src/test.
Run bunx vitest src/test/video.test.tsx to execute the test.