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export let name

let buttonText = 'Button'

function handleClick() {
buttonText = 'Button Clicked'

<h1>Hello {name}!</h1>

<button on:click="{handleClick}">{buttonText}</button>


// NOTE: jest-dom adds handy assertions to Jest (and Vitest) and it is recommended, but not required.
import '@testing-library/jest-dom'

import {render, fireEvent, screen} from '@testing-library/svelte'

import Comp from '../Comp'

test('shows proper heading when rendered', () => {
render(Comp, {name: 'World'})
const heading = screen.getByText('Hello World!')

// Note: This is as an async test as we are using `fireEvent`
test('changes button text on click', async () => {
render(Comp, {name: 'World'})
const button = screen.getByRole('button')

// Using await when firing events is unique to the svelte testing library because
// we have to wait for the next `tick` so that Svelte flushes all pending state changes.

expect(button).toHaveTextContent('Button Clicked')

For additional resources, patterns and best practices about testing svelte components and other svelte features take a look at the Svelte Society testing recipe.