Add additional tests

Author: pashanka

test/integration/auth.spec.ts

@@ -88,6 +88,13 @@ const actionCodeSettingsWithCustomDomain: ActionCodeSettings = {
     bundleId: 'com.google.experimental1.dev.extension0',
   },
 }
+const actionCodeSettingsForFdlLinks: ActionCodeSettings = {
+  url: 'http://localhost/?a=1&b=2#c=3',
+  handleCodeInApp: true,
+  iOS: {
+    bundleId: 'com.google.experimental1.dev.extension0',
+  },
+}
 let deleteQueue = Promise.resolve();
 
 interface UserImportTest {
@@ -1114,6 +1121,13 @@ describe('admin.auth', () => {
 
     // Create the test user before running this suite of tests.
     before(() => {
+      // Update project config to have HOSTING_DOMAIN as mobileLinksConfig after each test
+      const updateMobileLinksRequest: UpdateProjectConfigRequest = {
+        mobileLinksConfig: {
+          domain: 'HOSTING_DOMAIN',
+        },
+      };
+      getAuth().projectConfigManager().updateProjectConfig(updateMobileLinksRequest);
       return getAuth().createUser(userData);
     });
 
@@ -1316,6 +1330,54 @@ describe('admin.auth', () => {
           expect(result.user!.emailVerified).to.be.true;
         });
     });
+
+    it('generateSignInWithEmailLink() should return a FDL sign-in'
+      + 'link with mobileLinksConfig set to FIREBASE_DYNAMIC_LINK_DOMAIN', function () {
+      if (authEmulatorHost) {
+        return this.skip(); // Not yet supported in Auth Emulator.
+      }
+      
+      const updateMobileLinksRequest: UpdateProjectConfigRequest = {
+        mobileLinksConfig: {
+          domain: 'FIREBASE_DYNAMIC_LINK_DOMAIN',
+        }
+      };
+      return getAuth().projectConfigManager().updateProjectConfig(updateMobileLinksRequest)
+        .then((projectConfig) => {
+          expect(projectConfig?.mobileLinksConfig?.domain).equal('FIREBASE_DYNAMIC_LINK_DOMAIN');
+          return getAuth().generateSignInWithEmailLink(email, actionCodeSettingsForFdlLinks);
+        }).then((link) => {
+          expectFDLLink(link);
+          return clientAuth().signInWithEmailLink(email, link);
+        }).then((result) => {
+          expect(result.user).to.exist;
+          expect(result.user!.email).to.equal(email);
+          expect(result.user!.emailVerified).to.be.true;
+        });
+    });
+
+    it('generateSignInWithEmailLink() should return a FDL sign-in link with empty mobileLinksConfig', function () {
+      if (authEmulatorHost) {
+        return this.skip(); // Not yet supported in Auth Emulator.
+      }
+      
+      const updateMobileLinksRequest: UpdateProjectConfigRequest = {
+        mobileLinksConfig: {
+        }
+      };
+      return getAuth().projectConfigManager().updateProjectConfig(updateMobileLinksRequest)
+        .then((projectConfig) => {
+          expect(projectConfig.mobileLinksConfig).is.empty;
+          return getAuth().generateSignInWithEmailLink(email, actionCodeSettingsForFdlLinks);
+        }).then((link) => {
+          expectFDLLink(link);
+          return clientAuth().signInWithEmailLink(email, link);
+        }).then((result) => {
+          expect(result.user).to.exist;
+          expect(result.user!.email).to.equal(email);
+          expect(result.user!.emailVerified).to.be.true;
+        });
+    });
   });
 
   describe('Project config management operations', () => {
@@ -3339,7 +3401,7 @@ function getHostName(link: string): string {
  * URL will be of the form, http://abc/__/auth/link?link=<action link url>
  * Coninue URL will be part of action link url
  * 
- * @param link 
+ * @param link The link to parse for continue url
  * @returns 
  */
 function getContinueUrlForInAppRequest(link: string): string {
@@ -3355,6 +3417,21 @@ function getContinueUrlForInAppRequest(link: string): string {
   return continueUrl!;
 }
 
+/**
+ * Verify if the generated link is generated by FDL
+ * We leverage the params created by FDL to test whether a given link is FDL
+ * 
+ * @param link Link to check whether it is FDL
+ */
+function expectFDLLink(link: string): void {
+  const parsedUrl = new url.URL(link);
+  // For ios, FDL creates a fallback url with param ifl
+  // We leverage that to test whether a given link is FDL link
+  // Note: This param does not exist when the link is generated for HOSTING_DOMAIN
+  const iflParam = parsedUrl.searchParams.get('ifl');
+  expect(iflParam).is.not.null;
+}
+
 /**
  * Returns the tenant ID corresponding to the link.
  *