open-consul/ui/packages/consul-ui/tests/helpers/stub-super.js

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;
};
}