Agent skill
web-renderer-test
Add a test case to the web renderer
Install this agent skill to your Project
npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/other/web-renderer-test-remotion-dev-remotion-075d06e3
SKILL.md
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 = await renderStillOnWeb({
licenseKey: 'free-license',
composition: backgroundColor,
frame: 0,
inputProps: {},
imageFormat: 'png',
});
await testImage({blob, testId: 'background-color'});
});
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.tsxto add a way to preview it. - Add a new test in
packages/web-renderer/src/test. - Run
bunx vitest src/test/video.test.tsxto execute the test.
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