Mocking API Responses

API responses can be mocked by setting window.ajaxOverridesStore.

The store should contain an array, where each item is an object with two properties:

• filter: Determines which URLs to apply the override to. This can be specified in two ways:
  • A function that accepts arguments to fetch and returns a boolean
  • An object with two keys:
    • url: a regex matched against the request URL
    • method: (optional) a string compared against the request method
• fn: A function that wraps fetch (accepts a fetch function and returns a new fetch function

For example:

window.ajaxOverridesStore.set([
  {
    filter: { url: /api\/billing\/v2$/ },
    fn: () => () => Promise.resolve(new Response(JSON.stringify(projectListResult), { status: 200 }))
  }
]

window.ajaxOverrideUtils contains a few helpers for creating the fn function.

• mapJsonBody: takes a function that transforms the original response body
• makeError: takes an object with two keys:
  • status: status code for the mock response
  • frequency: (optional) number 0-1 that controls what proportion of responses are replaced with mock errors