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36 lines
725 B
JavaScript
36 lines
725 B
JavaScript
'use strict'
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module.exports = function stubs(obj, method, cfg, stub) {
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if (!obj || !method || !obj[method])
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throw new Error('You must provide an object and a key for an existing method')
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if (!stub) {
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stub = cfg
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cfg = {}
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}
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stub = stub || function() {}
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cfg.callthrough = cfg.callthrough || false
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cfg.calls = cfg.calls || 0
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var norevert = cfg.calls === 0
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var cached = obj[method].bind(obj)
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obj[method] = function() {
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var args = [].slice.call(arguments)
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var returnVal
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if (cfg.callthrough)
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returnVal = cached.apply(obj, args)
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returnVal = stub.apply(obj, args) || returnVal
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if (!norevert && --cfg.calls === 0)
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obj[method] = cached
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return returnVal
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}
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}
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