File download verification in Cypress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Verify file download success with Cypress

What will be the result of this Cypress test code when verifying a file download?

Cypress

cy.downloadFile('https://example.com/report.pdf', 'cypress/downloads', 'report.pdf')
  .then(() => {
    cy.readFile('cypress/downloads/report.pdf').should('have.length.above', 0)
  })

A Test fails because cy.readFile cannot read PDF files

B Test passes but file content is not verified

C Test fails due to syntax error in chaining

D Test passes because the file is downloaded and exists in the folder

💡 Hint

cy.readFile can check if a file exists after download

The code downloads the file and then checks if it exists in the downloads folder. This confirms the download succeeded.

❓ assertion

intermediate

Correct assertion to verify downloaded file content

Which assertion correctly verifies that the downloaded text file contains the word 'Success'?

Cypress

cy.readFile('cypress/downloads/result.txt').should(____)

A "have.text", "Success"

B "contain", "Success"

C "include", "Success"

D "include.text", "Success"

💡 Hint

Use the correct Cypress string assertion for substring matching

The 'contain' assertion checks if the file content includes the given substring.

🔧 Debug

advanced

Identify the error in this file download test

Why does this Cypress test fail to verify the downloaded file?

Cypress

cy.get('#download-btn').click()
cy.readFile('cypress/downloads/report.pdf').should('have.length.above', 0)

A cy.readFile cannot read PDF files

B The selector '#download-btn' is invalid

C The test does not wait for the download to complete before reading the file

D The file path is incorrect

💡 Hint

Downloads may take time; reading file immediately can fail

The test tries to read the file immediately after clicking download, but the file may not be fully saved yet.

🧠 Conceptual

advanced

Best practice for verifying file downloads in Cypress

Which approach is best to verify a file download in Cypress tests?

A Intercept the download request and check the response headers and body

B Click download button and immediately check file existence in downloads folder

C Use cy.readFile to read the file before clicking download

D Check the UI message that says 'Download started' without checking the file

💡 Hint

Intercepting network requests gives more control and certainty

Intercepting the download request allows verifying the actual file content and status before checking the file system.

❓ framework

expert

Implementing a custom Cypress command for file download verification

Which custom Cypress command implementation correctly waits for a file to be downloaded and verifies its existence?

Cypress

Cypress.Commands.add('verifyDownload', (fileName) => {
  const downloadsFolder = Cypress.config('downloadsFolder')
  cy.readFile(`${downloadsFolder}/${fileName}`, { timeout: 15000 }).should('have.length.above', 0)
})

A The command waits up to 15 seconds for the file to exist and asserts its presence

B The command immediately reads the file without waiting, causing flaky tests

C The command uses incorrect path syntax causing a runtime error

D The command only checks file size but not existence

💡 Hint

Use timeout option in cy.readFile to wait for file

Setting a timeout in cy.readFile allows waiting for the file to appear before asserting existence.