Adds "ctx.cookie()" response transformer

[kettanaito]

Changes

• Adds new ctx.cookie() utility

ctx.cookie('name', 'value', {
  httpOnly: false,
  expires: 'date string',
  domain: 'string'
})

Additionally, any options from cookie.

GitHub

• Closes Support mocking of cookies #101

Implementation

As setting Set-Cookie header on Response is generally forbidden, and Cookie Store is not ready, this feature takes advantage of response composition chain being executed on the client's side, and sets given cookies on the document.cookie directly. Such behavior imitates as if cookies received from response were set on the client side.

Calling ctx.cookie() also sets the Set-Cookie header on the client-side response object, so you can:

1. Inspect and interact with res.headers.get('set-cookie') inside response resolvers.
2. Inspect the cookie presence in the logs.