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51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
/*!
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* Chai - overwriteMethod 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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* ### overwriteMethod (ctx, name, fn)
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*
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* Overwites an already existing method and provides
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* access to previous function. Must return function
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* to be used for name.
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*
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* utils.overwriteMethod(chai.Assertion.prototype, 'equal', function (_super) {
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* return function (str) {
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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.value).to.equal(str);
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* } else {
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* _super.apply(this, arguments);
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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.overwriteMethod('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.equal('bar');
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*
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* @param {Object} ctx object whose method is to be overwritten
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* @param {String} name of method to overwrite
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* @param {Function} method function that returns a function to be used for name
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* @name overwriteMethod
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* @api public
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*/
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module.exports = function (ctx, name, method) {
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var _method = ctx[name]
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, _super = function () { return this; };
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if (_method && 'function' === typeof _method)
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_super = _method;
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ctx[name] = function () {
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var result = method(_super).apply(this, arguments);
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return result === undefined ? this : result;
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}
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};
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