web-renderer-test
remotion-dev
Add a test case to the web renderer
bunx add-skill remotion-dev/remotion -s web-renderer-testLoadingβ¦
remotion-dev
Add a test case to the web renderer
bunx add-skill remotion-dev/remotion -s web-renderer-testLoadingβ¦
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
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'});
});
packages/web-renderer/src/test/fixtures.packages/web-renderer/src/test/Root.tsx to add a way to preview it.packages/web-renderer/src/test.bunx vitest src/test/video.test.tsx to execute the test.Use when you need to run Flow type checking, or when seeing Flow type errors in React code.
Use when you want to validate changes before committing, or when you need to check all React contribution requirements.
Use when feature flag tests fail, flags need updating, understanding @gate pragmas, debugging channel-specific test failures, or adding new flags to React.
Use when you need to check feature flag states, compare channels, or debug why a feature behaves differently across release channels.