feat: Support dark mode in login pages (#7420)

Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/v3/helpers/specs/AuthHelper.spec.js

@@ -0,0 +1,43 @@
+import { getLoginRedirectURL } from '../AuthHelper';
+
+describe('#URL Helpers', () => {
+  describe('getLoginRedirectURL', () => {
+    it('should return correct Account URL if account id is present', () => {
+      expect(
+        getLoginRedirectURL({
+          ssoAccountId: '7500',
+          user: {
+            accounts: [{ id: 7500, name: 'Test Account 7500' }],
+          },
+        })
+      ).toBe('/app/accounts/7500/dashboard');
+    });
+
+    it('should return correct conversation URL if account id and conversationId is present', () => {
+      expect(
+        getLoginRedirectURL({
+          ssoAccountId: '7500',
+          ssoConversationId: '752',
+          user: {
+            accounts: [{ id: 7500, name: 'Test Account 7500' }],
+          },
+        })
+      ).toBe('/app/accounts/7500/conversations/752');
+    });
+
+    it('should return default URL if account id is not present', () => {
+      expect(getLoginRedirectURL({ ssoAccountId: '7500', user: {} })).toBe(
+        '/app/'
+      );
+      expect(
+        getLoginRedirectURL({
+          ssoAccountId: '7500',
+          user: {
+            accounts: [{ id: '7501', name: 'Test Account 7501' }],
+          },
+        })
+      ).toBe('/app/accounts/7501/dashboard');
+      expect(getLoginRedirectURL('7500', null)).toBe('/app/');
+    });
+  });
+});