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