open-consul/ui-v2/tests/helpers/stub-super.js
John Cowen 4ad691fa2f Looking into atob functionality, consequence of Value: null
The Consul API can pass through `Value: null` which does not get cast to
a string by ember-data. This snowballs into problems with `atob` which
then tried to decode `null`.

There are 2 problems here.

1. `Value` should never be `null`
  - I've added a removeNull function to shallowly loop though props and
  remove properties that are `null`, for the moment this is only on
  single KV JSON responses - therefore `Value` will never be `null`
  which is the root of the problem

2. `atob` doesn't quite follow the `window.atob` API in that the
`window.atob` API casts everything down to a string first, therefore it
will try to decode `null` > `'null'` > `crazy unicode thing`.
  - I've commented in a fix for this, but whilst this shouldn't be
  causing anymore problems in our UI (now that `Value` is never `null`),
  I'll uncomment it in another future release. Tests are already written
  for it which more closely follow `window.atob` but skipped for now
  (next commit)
2018-07-05 13:35:06 +01:00

54 lines
1.7 KiB
JavaScript

/**
* super stubber
* Ember's `_super` functionality is a little challenging to stub.
* The following will essentially let you stub `_super`, letting
* you test single units of code that use `_super`
* The return value is a function with the same signature as
* traditional `test` or `it` test functions. Any test code
* used within the cb 'sandbox' will use the stubbed `_super`.
* It's done this way to attempt to make it easy to reuse for various tests
* using the same stub in a recognisable way.
*
* @param {object} obj - The instance with the that `_super` belongs to
* @param {object} [stub=function(){return arguments}] -
* The stub to use in place of `_super`, if not specified `_super` will
* simply return the `arguments` passed to it
*
* @returns {function}
*/
export default function(obj, stub) {
const _super =
typeof stub === 'undefined'
? function() {
return arguments;
}
: stub;
/**
* @param {string} message - Message to accompany the test concept (currently unused)
* @param {function} cb - Callback that performs the test, will use the stubbed `_super`
* @returns The result of `cb`, and therefore maintain the same API
*/
return function(message, _cb) {
const cb = typeof message === 'function' ? message : _cb;
let orig = obj._super;
Object.defineProperty(Object.getPrototypeOf(obj), '_super', {
set: function() {},
get: function() {
return _super;
},
});
// TODO: try/catch this?
const actual = cb();
Object.defineProperty(Object.getPrototypeOf(obj), '_super', {
set: function(val) {
orig = val;
},
get: function() {
return orig;
},
});
return actual;
};
}