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

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

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

@@ -0,0 +1,69 @@
+import { validateRouteAccess } from '../RouteHelper';
+import { clearBrowserSessionCookies } from 'dashboard/store/utils/api';
+import { replaceRouteWithReload } from '../CommonHelper';
+import Cookies from 'js-cookie';
+
+const next = jest.fn();
+jest.mock('dashboard/store/utils/api', () => ({
+  clearBrowserSessionCookies: jest.fn(),
+}));
+jest.mock('../CommonHelper', () => ({ replaceRouteWithReload: jest.fn() }));
+
+jest.mock('js-cookie', () => ({
+  getJSON: jest.fn(),
+}));
+
+Cookies.getJSON.mockReturnValueOnce(true).mockReturnValue(false);
+describe('#validateRouteAccess', () => {
+  it('reset cookies and continues to the login page if the SSO parameters are present', () => {
+    validateRouteAccess(
+      {
+        name: 'login',
+        query: { sso_auth_token: 'random_token', email: 'random@email.com' },
+      },
+      next
+    );
+    expect(clearBrowserSessionCookies).toHaveBeenCalledTimes(1);
+    expect(next).toHaveBeenCalledTimes(1);
+  });
+
+  it('ignore session and continue to the page if the ignoreSession is present in route definition', () => {
+    validateRouteAccess(
+      {
+        name: 'login',
+        meta: { ignoreSession: true },
+      },
+      next
+    );
+    expect(clearBrowserSessionCookies).not.toHaveBeenCalled();
+    expect(next).toHaveBeenCalledTimes(1);
+  });
+
+  it('redirects to dashboard if auth cookie is present', () => {
+    Cookies.getJSON.mockImplementation(() => true);
+    validateRouteAccess({ name: 'login' }, next);
+    expect(clearBrowserSessionCookies).not.toHaveBeenCalled();
+    expect(replaceRouteWithReload).toHaveBeenCalledWith('/app/');
+    expect(next).not.toHaveBeenCalled();
+  });
+
+  it('redirects to login if route is empty', () => {
+    validateRouteAccess({}, next);
+    expect(clearBrowserSessionCookies).not.toHaveBeenCalled();
+    expect(next).toHaveBeenCalledWith('/app/login');
+  });
+
+  it('redirects to login if signup is disabled', () => {
+    validateRouteAccess({ meta: { requireSignupEnabled: true } }, next, {
+      signupEnabled: 'true',
+    });
+    expect(clearBrowserSessionCookies).not.toHaveBeenCalled();
+    expect(next).toHaveBeenCalledWith('/app/login');
+  });
+
+  it('continues to the route in every other case', () => {
+    validateRouteAccess({ name: 'reset_password' }, next);
+    expect(clearBrowserSessionCookies).not.toHaveBeenCalled();
+    expect(next).toHaveBeenCalledWith();
+  });
+});