cy.readFile() assertions in Cypress - Test Execution Trace

Test Overview

This test reads a JSON file using cy.readFile() and verifies that the file contains expected data. It checks the presence and correctness of specific keys and values.

Test Code - Cypress

Cypress

describe('Read JSON file and assert contents', () => {
  it('should read the file and verify its content', () => {
    cy.readFile('cypress/fixtures/user.json').then((data) => {
      expect(data).to.have.property('name', 'Alice');
      expect(data).to.have.property('age').that.is.a('number');
      expect(data.hobbies).to.include('reading');
    });
  });
});

Execution Trace - 7 Steps

Step	Action	System State	Assertion	Result
1	Test starts	Cypress test runner is ready	-	PASS
2	Cypress opens test environment	Browser window opens with Cypress test runner UI	-	PASS
3	cy.readFile('cypress/fixtures/user.json') is called	File 'user.json' is accessed in fixtures folder	File is successfully read and parsed as JSON	PASS
4	Assertion: expect(data).to.have.property('name', 'Alice')	Data object contains key 'name' with value 'Alice'	Check that 'name' property equals 'Alice'	PASS
5	Assertion: expect(data).to.have.property('age').and.be.a('number')	Data object contains key 'age' with a numeric value	Check that 'age' property exists and is a number	PASS
6	Assertion: expect(data.hobbies).to.include('reading')	Data object has 'hobbies' array including 'reading'	Check that 'reading' is included in hobbies array	PASS
7	Test ends	All assertions passed, test completes successfully	-	PASS

Failure Scenario

Failing Condition: The file 'user.json' is missing or the 'name' property is not 'Alice'

Execution Trace Quiz - 3 Questions

What does cy.readFile('cypress/fixtures/user.json') do in this test?

A Writes data to the JSON file

B Reads and parses the JSON file from the fixtures folder

C Deletes the JSON file

D Opens a browser window

Key Result

Always verify that the file path is correct and the JSON content matches expected values before asserting properties with cy.readFile().