Does not seem to work in an initial Rails app?

[spilth]

I realize this is probably an edge case, but I tried to set up a Rails project with the minimal Cypress integration by checking that the root path serves up the default "Yay!" Rails page. I was surprised to get a 500 error but also suspect most folks will never try to write this test.

Here is a repo that shows the issue: https://github.com/spilth/cypress-rails-test

And here are instructions to replicate from scratch:

$  ruby -v
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin20
$ rails new cypress-rails-test
$ cd cypress-rails-test
$ bin/setup
$ yarn add --dev cypress
$ bundle add cypress-rails --group "development,test"
$ bundle install
$ rake cypress:init
$ mkdir -p cypress/integration

Create cypress/integration/homepage.spec.js with the following contents:

/// <reference types="cypress" />

context('Homepage', () => {
    it('displays the rails message', () => {
        cy.visit('/')
        cy.get('h1').should('have.text', 'Yay! You’re on Rails!')
    })
})

Then run Cypress:

$ rake cypress:run
...
Homepage
2020-12-27 13:53:50 -0600 Rack app ("GET /" - (127.0.0.1)): #<ActionController::RoutingError: No route matches [GET] "/">
  1) displays the rails message


0 passing (1s)
1 failing

1) Homepage
     displays the rails message:
   CypressError: `cy.visit()` failed trying to load:

http://127.0.0.1:64955/

The response we received from your web server was:

> 500: Internal Server Error

This was considered a failure because the status code was not `2xx`.

And if you run Cypress via rake cypress:open and try to visit the root page, it displays the following:

An unhandled lowlevel error occurred. The application logs may have details.

[searls]

Yeah, this is probably because that route only renders in RAILS_ENV=development, IIRC.