vega-frontend-monorepo/apps/trading-e2e/src/support/index.js

import '@vegaprotocol/cypress';
import 'cypress-real-events/support';
import registerCypressGrep from 'cypress-grep';
import { aliasQuery } from '@vegaprotocol/cypress';
registerCypressGrep();

beforeEach(() => {
  // Mock chainId fetch which happens on every page for wallet connection
  cy.mockGQL((req) => {
    aliasQuery(req, 'ChainId', {
      statistics: { __typename: 'Statistics', chainId: 'test-chain-id' },
    });
  });
});