Created
December 20, 2012 22:08
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/* mock a module with faked dependencies | |
var x = mock("../lib/x.js", { | |
fs: { | |
readdir: function readdir() { return 42 } | |
} | |
}) | |
*/ | |
function mock(name, mocks) { | |
var moduleUri = require.resolve(name) | |
var old = Object.keys(mocks).reduce(function (acc, key) { | |
var impl = mocks[key] | |
, mockUri = require.resolve(key) | |
, oldImpl = require.cache[mockUri] | |
require.cache[mockUri] = { | |
"exports": impl | |
} | |
acc[key] = oldImpl | |
return acc | |
}, {}) | |
var impl = getModule(moduleUri) | |
Object.keys(old).forEach(function (key) { | |
var impl = old[key] | |
, mockUri = require.resolve(key) | |
require.cache[mockUri] = impl | |
}) | |
return impl | |
} | |
function getModule(moduleUri) { | |
if (require.modules) { | |
var constr = require.modules[moduleUri] | |
return constr() | |
} else { | |
var old = require.cache[moduleUri] | |
;delete require.cache[moduleUri] | |
var impl = require(moduleUri) | |
require.cache[moduleUri] = old | |
return impl | |
} | |
} |
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