I am building a web application using React JS. I am writing integration tests using Cypress for my application. In my tests, I am reading JSON data from fixture files. When I read fixture file, it is throwing the following error.
TypeError: Converting circular structure to JSON
--> starting at object with constructor 'Window'
--- property 'window' closes the circle
This is my code.
describe('Login', () => {
it('renders login form render the form controls', () => {
it('redirects to dashboard page when login is successful', () => {
// TODO: use fixture
// TODO: give alias
// TODO: mock me endpoint
const accessToken = 'fake access token'
const loginResponseJson = cy.fixture('superadmin-login.json');
})
})
This is my superadmin-login.json fixture file.
{
"accessToken": "fake access token",
"token": {
"id": "c09dd33fbdcbf780ddb4d784002f1b4c8413cc298f2465f5f3e3c3481b2aa7f586d14f04af163a1c",
"user_id": 31,
"client_id": 1,
"name": "User Access Token",
"scopes": [],
"revoked": false,
"created_at": "2022-05-24 20:39:48",
"updated_at": "2022-05-24 20:39:48",
"expires_at": "2025-05-24T20:39:48.000000Z"
}
}
What is wrong with my code and how can I fix it?
Reading a fixture file is an asynchronous operation, so this should work for you
cy.fixture('superadmin-login.json').then(loginResponseJson => {
const token = loginResponseJson.token;
...
})
Note, Cypress has it's own type of a-synchronicity (command-queue model), so you can't do this either
// won't work
const loginResponseJson = await cy.fixture('superadmin-login.json')
You could require it at the top of the spec if you like to minimise .then() callbacks.
const loginResponseJson = require('./cypress/fixtures/superadmin-login.json')
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