init

src/stories/Page.stories.svelte

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+<script module>
+  import { defineMeta } from '@storybook/addon-svelte-csf';
+  import { expect, userEvent, waitFor, within } from 'storybook/test';
+  import Page from './Page.svelte';
+  import { fn } from 'storybook/test';
+
+  // More on how to set up stories at: https://storybook.js.org/docs/writing-stories
+  const { Story } = defineMeta({
+    title: 'Example/Page',
+    component: Page,
+    parameters: {
+      // More on how to position stories at: https://storybook.js.org/docs/configure/story-layout
+      layout: 'fullscreen',
+    },
+  });
+</script>
+
+<Story name="Logged In" play={async ({ canvasElement }) => {
+    const canvas = within(canvasElement);
+    const loginButton = canvas.getByRole('button', { name: /Log in/i });
+    await expect(loginButton).toBeInTheDocument();
+    await userEvent.click(loginButton);
+    await waitFor(() => expect(loginButton).not.toBeInTheDocument());
+
+    const logoutButton = canvas.getByRole('button', { name: /Log out/i });
+    await expect(logoutButton).toBeInTheDocument();
+  }}
+/>
+
+<Story name="Logged Out" />