storybook/docs/snippets/common/test-runner-helper-function.ts.mdx

```ts
// .storybook/test-runner.ts

import type { TestRunnerConfig } from '@storybook/test-runner';
import { getStoryContext, waitForPageReady } from '@storybook/test-runner';

const config: TestRunnerConfig = {
  // Hook that is executed before the test runner starts running tests
  setup() {
    // Add your configuration here.
  },
  /* Hook to execute before a story is initially visited before being rendered in the browser.
   * The page argument is the Playwright's page object for the story.
   * The context argument is a Storybook object containing the story's id, title, and name.
   */
  async preVisit(page, context) {
    // Add your configuration here.
  },
  /* Hook to execute after a story is visited and fully rendered.
   * The page argument is the Playwright's page object for the story
   * The context argument is a Storybook object containing the story's id, title, and name.
   */
  async postVisit(page, context) {
    // Get the entire context of a story, including parameters, args, argTypes, etc.
    const storyContext = await getStoryContext(page, context);

    // This utility function is designed for image snapshot testing. It will wait for the page to be fully loaded, including all the async items (e.g., images, fonts, etc.).
    await waitForPageReady(page);

    // Add your configuration here.
  },
};

export default config;
```