test(browser): cover document-start inpage injection

davidmurdoch · davidmurdoch · commit 78264d2c1c34 · 2026-05-06T16:30:17.000-04:00
diff --git a/tests/fixtures/inpage-injection/document-start.html b/tests/fixtures/inpage-injection/document-start.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <title>Document Start Injection Test Dapp</title>
+    <script>
+      window.__mmEthereumAtFirstInlineScript =
+        typeof window.ethereum !== 'undefined';
+
+      if (!window.__mmEthereumAtFirstInlineScript) {
+        throw new Error('window.ethereum should be available synchronously');
+      }
+    </script>
+  </head>
+  <body>
+    <main>
+      <h1>Document Start Injection Test Dapp</h1>
+      <p id="document-start-status">Waiting for result</p>
+    </main>
+    <script>
+      const status = document.getElementById('document-start-status');
+
+      if (window.__mmEthereumAtFirstInlineScript) {
+        status.textContent =
+          'window.ethereum was available before the first inline script completed';
+      } else {
+        status.textContent =
+          'window.ethereum was missing before the first inline script completed';
+      }
+    </script>
+  </body>
+</html>
diff --git a/tests/page-objects/Browser/DocumentStartDapp.ts b/tests/page-objects/Browser/DocumentStartDapp.ts
@@ -0,0 +1,28 @@
+import { BrowserViewSelectorsIDs } from '../../../app/components/Views/BrowserTab/BrowserView.testIds';
+import { Assertions, Matchers } from '../../framework';
+import {
+  DocumentStartDappSelectorsText,
+  DocumentStartDappSelectorsWebIDs,
+} from '../../selectors/Browser/DocumentStartDapp.selectors';
+
+class DocumentStartDapp {
+  get documentStartStatus(): WebElement {
+    return Matchers.getElementByWebID(
+      BrowserViewSelectorsIDs.BROWSER_WEBVIEW_ID,
+      DocumentStartDappSelectorsWebIDs.DOCUMENT_START_STATUS,
+    );
+  }
+
+  async expectEthereumAvailableBeforeFirstInlineScript(): Promise<void> {
+    await Assertions.expectElementToContainText(
+      this.documentStartStatus,
+      DocumentStartDappSelectorsText.ETHEREUM_AVAILABLE_BEFORE_INLINE_SCRIPT,
+      {
+        description:
+          'window.ethereum should be available before the first inline script completes',
+      },
+    );
+  }
+}
+
+export default new DocumentStartDapp();
diff --git a/tests/selectors/Browser/DocumentStartDapp.selectors.ts b/tests/selectors/Browser/DocumentStartDapp.selectors.ts
@@ -0,0 +1,8 @@
+export const DocumentStartDappSelectorsWebIDs = {
+  DOCUMENT_START_STATUS: 'document-start-status',
+} as const;
+
+export const DocumentStartDappSelectorsText = {
+  ETHEREUM_AVAILABLE_BEFORE_INLINE_SCRIPT:
+    'window.ethereum was available before the first inline script completed',
+} as const;
diff --git a/tests/smoke/wallet/browser/browser-inpage-injection.spec.ts b/tests/smoke/wallet/browser/browser-inpage-injection.spec.ts
@@ -0,0 +1,46 @@
+// eslint-disable-next-line import-x/no-nodejs-modules
+import path from 'path';
+import { SmokeBrowser } from '../../../tags.js';
+import FixtureBuilder from '../../../framework/fixtures/FixtureBuilder';
+import { withFixtures } from '../../../framework/fixtures/FixtureHelper';
+import { DappVariants } from '../../../framework/Constants';
+import { getDappUrl } from '../../../framework/fixtures/FixtureUtils';
+import { loginToApp } from '../../../flows/wallet.flow';
+import { navigateToBrowserView } from '../../../flows/browser.flow';
+import Browser from '../../../page-objects/Browser/BrowserView';
+import DocumentStartDapp from '../../../page-objects/Browser/DocumentStartDapp';
+
+const INPAGE_INJECTION_FIXTURES_PATH = path.resolve(
+  __dirname,
+  '../../../fixtures/inpage-injection',
+);
+
+describe(SmokeBrowser('Browser Inpage Injection'), () => {
+  beforeEach(() => {
+    jest.setTimeout(150000);
+  });
+
+  it('injects window.ethereum before the first dapp script runs', async () => {
+    await withFixtures(
+      {
+        dapps: [
+          {
+            dappVariant: DappVariants.TEST_DAPP,
+            dappPath: INPAGE_INJECTION_FIXTURES_PATH,
+          },
+        ],
+        fixture: new FixtureBuilder().build(),
+        restartDevice: true,
+      },
+      async () => {
+        await loginToApp();
+        await navigateToBrowserView();
+
+        await Browser.tapUrlInputBox();
+        await Browser.navigateToURL(`${getDappUrl(0)}/document-start.html`);
+
+        await DocumentStartDapp.expectEthereumAvailableBeforeFirstInlineScript();
+      },
+    );
+  });
+});
