Update Cypress._ to use lodash instead of underscore

[jennifer-shehane]

Current behavior:

Currently, Cypress automatically includes Underscore and exposes it as Cypress._. where you can call any valid Underscore method on Cypress._.

New behavior:

Cypress has updated our internal libraries including the driver to use lodash. It then seemed unnecessary to include both Underscore and lodash in order to maintain Cypress._ current use.

Also, since any library can be imported, the use of Cypress._ is not as essential as it once was.

If you want to continue using Underscore methods in your tests, you can include the following after npm install --save-dev underscore:

var _ = require('underscore')

it('calls an underscore method', function(){
  cy.request('https://jsonplaceholder.typicode.com/users').then(function(response){
    var ids = _.chain(response.body).pluck('id').first(3).value()
    expect(ids).to.deep.eq([1, 2, 3])
  })
})

[RandallKent]

The code for this is done, but this has yet to be released. We'll update the issue and reference the changelog when it's released.

[brian-mann]

Fixed in 0.20.0