Node.js prerequisite in Cypress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Understanding Node.js version compatibility with Cypress

Given the following Node.js version check code snippet used before running Cypress tests, what will be the output if the Node.js version is 14.17.0?

Cypress

const semver = require('semver');
const nodeVersion = process.version;
if (semver.satisfies(nodeVersion, '>=16.0.0')) {
  console.log('Node.js version is compatible with Cypress');
} else {
  console.log('Node.js version is NOT compatible with Cypress');
}

A Node.js version is NOT compatible with Cypress

B Node.js version is compatible with Cypress

C SyntaxError: Unexpected token >

D ReferenceError: semver is not defined

💡 Hint

Check the Node.js version against the required minimum version 16.0.0.

The code checks if the Node.js version is 16.0.0 or higher. Since 14.17.0 is lower, the else branch runs, printing that the version is NOT compatible.

❓ assertion

intermediate

Correct assertion for Node.js version in Cypress test

Which assertion correctly verifies that the Node.js version used in Cypress tests is at least 16.0.0?

Cypress

const semver = require('semver');
const nodeVersion = process.version;
// Assertion here

A assert.isTrue(nodeVersion > 16);

B assert.equal(semver.satisfies(nodeVersion, '>=16.0.0'), false);

C expect(semver.satisfies(nodeVersion, '>=16.0.0')).to.be.true;

D expect(nodeVersion >= '16.0.0').to.be.true;

💡 Hint

Use semver.satisfies to compare versions properly.

Option C uses semver.satisfies correctly and asserts true if the version is >=16.0.0. Other options either compare strings incorrectly or assert false.

🔧 Debug

advanced

Debugging Node.js version check failure in Cypress

A Cypress test fails with the error: "ReferenceError: semver is not defined" when running the following code. What is the cause?

Cypress

if (semver.satisfies(process.version, '>=16.0.0')) {
  cy.log('Compatible Node.js version');
} else {
  cy.log('Incompatible Node.js version');
}

A The semver package is not imported or required before use.

B process.version is undefined in Cypress tests.

C The satisfies method does not exist on semver.

D Node.js version must be a number, not a string.

💡 Hint

Check if semver is declared or imported in the code.

The error means semver is used without importing it. The code must include 'const semver = require("semver");' before using semver.

🧠 Conceptual

advanced

Why Node.js version matters for Cypress tests

Why is it important to have a compatible Node.js version installed before running Cypress tests?

A Because Node.js version controls the browser rendering engine used by Cypress.

B Because Node.js version affects the CSS styles applied in Cypress tests.

C Because Cypress tests run directly in the Node.js command line without browsers.

D Because Cypress depends on Node.js features that may not exist in older versions.

💡 Hint

Think about the runtime environment Cypress uses.

Cypress runs on Node.js and uses its APIs. Older Node.js versions may lack features Cypress requires, causing failures.

❓ framework

expert

Configuring Cypress to check Node.js version before tests

Which code snippet correctly integrates a Node.js version check into Cypress's 'before' hook to skip tests if Node.js version is below 16.0.0?

A

const semver = require('semver');
before(() => {
  if (!semver.satisfies(process.version, '>=16.0.0')) {
    cy.log('Skipping tests due to incompatible Node.js version');
    Cypress.runner.stop();
  }
});

B

const semver = require('semver');
before(function() {
  if (!semver.satisfies(process.version, '>=16.0.0')) {
    cy.log('Skipping tests due to incompatible Node.js version');
    this.skip();
  }
});

C

before(() => {
  if (process.version < '16.0.0') {
    cy.log('Skipping tests');
    Cypress.stop();
  }
});

D

const semver = require('semver');
before(() => {
  if (semver.satisfies(process.version, '<16.0.0')) {
    cy.log('Skipping tests');
    throw new Error('Incompatible Node.js version');
  }
});

💡 Hint

Use the correct Cypress method to skip tests inside hooks.

Option B uses 'this.skip()' inside the before hook to skip tests properly. Option B tries to stop Cypress runner incorrectly. Option B uses invalid Cypress.stop(). Option B throws error instead of skipping.