Write Unit Tests In Cypress With Mocking Node FSreadFileSync Method

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If you have a lot of end-to-end Cypress tests and want to quickly add a few unit tests, you do not have to bring a second test runner. You can use Cypress to write and run unit tests, and even mock Node modules like fs.readFileSync if needed. Find the full source code for this example in repo https://github.com/bahmutov/cypress-t... • Example source code that uses fs.readFileSync • const fs = require('fs') • function findCasesInSpec(spec, readFile = fs.readFileSync) { • ... • } • module.exports = { findCasesInSpec } • Example unit test that passes our stub to replace fs.readFileSync • import { findCasesInSpec } from '../../src/find-cases' • it('finds test case ids', function () { • const source = ` • it('C101', ...) • ` • const readFile = cy.stub().returns(source) • const ids = findCasesInSpec('spec1.js', readFile) • expect(ids).to.deep.equal([101]) • expect(readFile).to.be.calledWith('spec1.js', 'utf8') • })

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