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40 lines
1 KiB
JavaScript
40 lines
1 KiB
JavaScript
/*!
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* Chai - addProperty 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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* ### addProperty (ctx, name, getter)
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*
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* Adds a property to the prototype of an object.
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*
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* utils.addProperty(chai.Assertion.prototype, 'foo', function () {
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* var obj = utils.flag(this, 'object');
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* new chai.Assertion(obj).to.be.instanceof(Foo);
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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.addProperty('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.foo;
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*
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* @param {Object} ctx object to which the property is added
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* @param {String} name of property to add
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* @param {Function} getter function to be used for name
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* @name addProperty
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* @api public
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*/
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module.exports = function (ctx, name, getter) {
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Object.defineProperty(ctx, name,
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{ get: function () {
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var result = getter.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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