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54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
/*!
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* Chai - overwriteProperty utility
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* Copyright(c) 2012-2014 Jake Luer <jake@alogicalparadox.com>
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* MIT Licensed
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*/
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/**
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* ### overwriteProperty (ctx, name, fn)
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*
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* Overwites an already existing property getter and provides
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* access to previous value. Must return function to use as getter.
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*
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* utils.overwriteProperty(chai.Assertion.prototype, 'ok', function (_super) {
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* return function () {
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* var obj = utils.flag(this, 'object');
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* if (obj instanceof Foo) {
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* new chai.Assertion(obj.name).to.equal('bar');
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* } else {
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* _super.call(this);
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* }
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* }
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* });
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*
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*
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* Can also be accessed directly from `chai.Assertion`.
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*
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* chai.Assertion.overwriteProperty('foo', fn);
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*
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* Then can be used as any other assertion.
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*
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* expect(myFoo).to.be.ok;
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*
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* @param {Object} ctx object whose property is to be overwritten
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* @param {String} name of property to overwrite
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* @param {Function} getter function that returns a getter function to be used for name
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* @name overwriteProperty
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* @api public
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*/
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module.exports = function (ctx, name, getter) {
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var _get = Object.getOwnPropertyDescriptor(ctx, name)
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, _super = function () {};
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if (_get && 'function' === typeof _get.get)
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_super = _get.get
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Object.defineProperty(ctx, name,
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{ get: function () {
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var result = getter(_super).call(this);
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return result === undefined ? this : result;
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}
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, configurable: true
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});
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};
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