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55 lines
1.4 KiB
55 lines
1.4 KiB
/**
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* Module that allows client-side code to use browser globals (such as `document` or `Node`) in a
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* way that allows those globals to be replaced by mocks in browser-less tests.
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*
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* E.g. test/client/clientUtil.js can replace globals with those provided by jsdom.
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*/
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var allGlobals = [];
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/* global window */
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var globalVars = (typeof window !== 'undefined' ? window : {});
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/**
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* Usage: to get access to global variables `foo` and `bar`, call:
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* var G = require('browserGlobals').get('foo', 'bar');
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* and use G.foo and G.bar.
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*
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* This modules stores a reference to G, so that setGlobals() call can replace the values to which
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* G.foo and G.bar refer.
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*/
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function get(varArgNames) {
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var obj = {
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neededNames: Array.prototype.slice.call(arguments),
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globals: {}
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};
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updateGlobals(obj);
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allGlobals.push(obj);
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return obj.globals;
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}
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exports.get = get;
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/**
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* Internal helper which updates properties of all globals objects created with get().
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*/
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function updateGlobals(obj) {
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obj.neededNames.forEach(function(key) {
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obj.globals[key] = globalVars[key];
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});
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}
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/**
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* Replace globals with those from the given object. The previous mapping of global values is
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* returned, so that it can be restored later.
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*/
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function setGlobals(globals) {
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var oldVars = globalVars;
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globalVars = globals;
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allGlobals.forEach(function(obj) {
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updateGlobals(obj);
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});
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return oldVars;
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}
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exports.setGlobals = setGlobals;
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