(core) Update HomeIntro.ts to check for either login page

Summary:
The "Sign In" button can either redirect you to the Cognito login
page or the Grist sign-up page, depending on whether you've logged
in before. Since the HomeIntro tests can either be run as part of a full
deployment test suite, or individually, the test could redirect you to
both types of login pages.

Test Plan: N/A (fixing test)

Reviewers: paulfitz

Reviewed By: paulfitz

Subscribers: paulfitz

Differential Revision: https://phab.getgrist.com/D3291

test/nbrowser/HomeIntro.ts

@@ -27,10 +27,9 @@ describe('HomeIntro', function() {
       const signUp = await driver.findContent('.test-welcome-text a', 'sign up');
       assert.include(await signUp.getAttribute('href'), '/signin');
 
-      // Check that the link takes us to a login page.
+      // Check that the link takes us to a login page (either Cognito or Grist, depending on session).
       await signUp.click();
-      // External servers redirect to Grist sign-up page if client has no sessions.
-      server.isExternalServer() ? await gu.checkGristLoginPage() : await gu.checkLoginPage();
+      await gu.checkSigninPage();
       await driver.navigate().back();
       await gu.waitForDocMenuToLoad();
     });

test/nbrowser/gristUtils.ts

@@ -43,6 +43,7 @@ export const setValue = homeUtil.setValue.bind(homeUtil);
 export const isOnLoginPage = homeUtil.isOnLoginPage.bind(homeUtil);
 export const checkLoginPage = homeUtil.checkLoginPage.bind(homeUtil);
 export const checkGristLoginPage = homeUtil.checkGristLoginPage.bind(homeUtil);
+export const checkSigninPage = homeUtil.checkSigninPage.bind(homeUtil);
 
 export const fixturesRoot: string = testUtils.fixturesRoot;
 

test/nbrowser/homeUtil.ts

@@ -273,10 +273,20 @@ export class HomeUtil {
   /**
    * Waits for browser to navigate to Grist login page.
    */
-   public async checkGristLoginPage(waitMs: number = 4000) {
+   public async checkGristLoginPage(waitMs: number = 2000) {
     await this.driver.wait(this.isOnGristLoginPage.bind(this), waitMs);
   }
 
+  /**
+   * Waits for browser to navigate to either the Cognito or Grist login page.
+   */
+  public async checkSigninPage(waitMs: number = 4000) {
+    await this.driver.wait(
+      async () => await this.isOnLoginPage() || await this.isOnGristLoginPage(),
+      waitMs
+    );
+  }
+
   /**
    * Delete and recreate the user, via the specified org.  The specified user must be
    * currently logged in!