test(ui): verify storybook light theme

playwright.config.ts

@@ -2,6 +2,8 @@ import { defineConfig, devices } from "@playwright/test";
 
 const port = Number(process.env.PLAYWRIGHT_PORT || 4173);
 const baseURL = `http://127.0.0.1:${port}`;
+const storybookPort = Number(process.env.PLAYWRIGHT_STORYBOOK_PORT || 6007);
+const storybookURL = `http://127.0.0.1:${storybookPort}`;
 const databaseUrl =
   process.env.PLAYWRIGHT_DATABASE_URL ||
   `file:./data/playwright-${process.pid}-${Date.now()}.sqlite`;
@@ -17,12 +19,20 @@ export default defineConfig({
     trace: "retain-on-failure",
     screenshot: "only-on-failure",
   },
-  webServer: {
+  webServer: [
-    command: `DISABLE_LIVE_DATASOURCES=1 bun run build && DISABLE_LIVE_DATASOURCES=1 DATABASE_URL=${databaseUrl} HOST=127.0.0.1 PORT=${port} bun build/index.js`,
+    {
-    url: baseURL,
+      command: `DISABLE_LIVE_DATASOURCES=1 bun run build && DISABLE_LIVE_DATASOURCES=1 DATABASE_URL=${databaseUrl} HOST=127.0.0.1 PORT=${port} bun build/index.js`,
-    reuseExistingServer: false,
+      url: baseURL,
-    timeout: 120_000,
+      reuseExistingServer: false,
-  },
+      timeout: 120_000,
+    },
+    {
+      command: `[ -f storybook-static/iframe.html ] || bun run build-storybook; STORYBOOK_STATIC_PORT=${storybookPort} bun tests/e2e/storybook-server.ts`,
+      url: storybookURL,
+      reuseExistingServer: false,
+      timeout: 120_000,
+    },
+  ],
   projects: [
     {
       name: "chromium-desktop",

src/lib/ui/stories/ThemeToggle.stories.tsx

@@ -20,9 +20,7 @@ export const Light: Story = {
   args: {
     theme: "light",
   },
-  parameters: {
+  globals: {
-    globals: {
+    theme: "light",
-      theme: "light",
-    },
   },
 };

tests/e2e/storybook-server.ts

@@ -0,0 +1,33 @@
+import { existsSync } from "node:fs";
+import { resolve, sep } from "node:path";
+
+const root = resolve(process.cwd(), "storybook-static");
+const port = Number(process.env.STORYBOOK_STATIC_PORT || 6007);
+
+if (!existsSync(resolve(root, "iframe.html"))) {
+  throw new Error("storybook-static is missing. Run bun run build-storybook first.");
+}
+
+Bun.serve({
+  hostname: "127.0.0.1",
+  port,
+  async fetch(request) {
+    const url = new URL(request.url);
+    const pathname = decodeURIComponent(url.pathname);
+    const relativePath = pathname === "/" ? "/index.html" : pathname;
+    const filePath = resolve(root, `.${relativePath}`);
+
+    if (!filePath.startsWith(`${root}${sep}`)) {
+      return new Response("Forbidden", { status: 403 });
+    }
+
+    const file = Bun.file(filePath);
+    if (!(await file.exists())) {
+      return new Response("Not found", { status: 404 });
+    }
+
+    return new Response(file);
+  },
+});
+
+console.log(`Storybook static listening on http://127.0.0.1:${port}`);

tests/e2e/storybook.spec.ts

@@ -0,0 +1,32 @@
+import { expect, test } from "@playwright/test";
+
+const storybookPort = Number(process.env.PLAYWRIGHT_STORYBOOK_PORT || 6007);
+const storybookURL = `http://127.0.0.1:${storybookPort}`;
+
+test.describe("Storybook theme QA", () => {
+  test("renders the ThemeToggle light story on the light canvas", async ({
+    page,
+  }, testInfo) => {
+    test.skip(testInfo.project.name !== "chromium-desktop");
+
+    const consoleMessages: string[] = [];
+    page.on("console", (message) => {
+      if (["error", "warning"].includes(message.type())) {
+        consoleMessages.push(message.text());
+      }
+    });
+
+    const url = `${storybookURL}/iframe.html?id=ui-themetoggle--light&viewMode=story`;
+    await page.goto(url, { waitUntil: "networkidle" });
+
+    await expect(page.locator("html")).toHaveAttribute("data-ui-theme", "light");
+    await expect(
+      page.getByRole("button", { name: "Switch to dark theme" }),
+    ).toBeVisible();
+    expect(
+      consoleMessages.filter((message) =>
+        message.includes("Global args/argTypes can only be set globally"),
+      ),
+    ).toEqual([]);
+  });
+});