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all tests up and running
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‎LICENSE‎

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Copyright (c) 2012 Nathan MacInnes
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

‎Makefile‎

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test:
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mocha -R spec
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.PHONY: test

‎lib/getLeakingSrc.js‎

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"use strict"; // run code in ES5 strict mode
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function getLeakingSrc(leaks) {
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var src = "exports.__ = {",
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varName,
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i;
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for (i = 0; i < leaks.length; i++) {
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varName = leaks[i];
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src += (varName + ":" + varName + ",");
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}
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if (i > 0) {
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src = src.slice(0, -1); // trim last comma
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}
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src += "};";
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return src;
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}
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module.exports = getLeakingSrc;

‎lib/getMonkeyPatchSrc.js‎

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"use strict"; // run code in ES5 strict mode
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var toSrc = require("toSrc");
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function getMonkeyPatchSrc(obj) {
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function walkObj(obj, level) {
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var key,
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value,
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src = "";
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for (key in obj) {
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if (obj.hasOwnProperty(key)) {
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value = obj[key];
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if (typeof value === "object" && Array.isArray(value) === false) {
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src += key + ".";
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src += walkObj(value, level + 1);
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} else {
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if (level === 0) {
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src += "var "; // in the top level, we need a var statement to override variables
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}
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src += key + "=" + toSrc(value, 9999) + ";";
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}
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}
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}
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return src;
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}
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return walkObj(obj, 0);
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}
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module.exports = getMonkeyPatchSrc;

‎lib/index.js‎

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"use strict"; // run code in ES5 strict mode
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var trick = require("./trick.js");
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module.exports = function (request, mocks, injections, leaks, cache) {
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delete require.cache[__filename]; // deleting self from module cache so the parent module is always up to date
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if (cache === undefined) {
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cache = true;
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}
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return trick(module.parent, request, mocks, injections, leaks, cache);
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};

‎lib/trick.js‎

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"use strict"; // run code in ES5 strict mode
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var Module = require("module"),
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nodeWrapper0 = Module.wrapper[0], // caching original wrapper
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nodeWrapper1 = Module.wrapper[1],
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getLeakingSrc = require("./getLeakingSrc.js"),
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getMonkeyPatchSrc = require("./getMonkeyPatchSrc.js");
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function restoreOriginalWrappers() {
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Module.wrapper[0] = nodeWrapper0;
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Module.wrapper[1] = nodeWrapper1;
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}
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function trick(parentModule, filename, mocks, injections, leaks, cache) {
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var testModule,
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nodeRequire;
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function requireTrick(path) {
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restoreOriginalWrappers(); // we need to restore the wrappers now so we don't influence other modules
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if (mocks && mocks.hasOwnProperty(path)) {
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return mocks[path];
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} else {
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return nodeRequire.call(testModule, path); // node's require only works when "this" points to the module
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}
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}
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// Checking params
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if (typeof filename !== "string") {
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throw new TypeError("Filename must be a string");
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}
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// Init vars
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filename = Module._resolveFilename(filename, parentModule); // resolve full filename relative to the parent module
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testModule = new Module(filename, parentModule);
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nodeRequire = testModule.require; // caching original node require
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// Prepare module for injection
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if (typeof injections === "object") {
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Module.wrapper[0] = nodeWrapper0 + getMonkeyPatchSrc(injections);
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} else if (typeof injections === "string") {
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Module.wrapper[0] = nodeWrapper0 + injections;
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}
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// Prepare module for leaking private vars
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if (Array.isArray(leaks)) {
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Module.wrapper[1] = getLeakingSrc(leaks) + nodeWrapper1;
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}
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// Mocking module.require-function
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testModule.require = requireTrick;
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// Loading module
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testModule.load(testModule.id);
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if (cache) {
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require.cache[filename] = testModule;
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}
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restoreOriginalWrappers(); // this is only necessary if nothing has been required within the module
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return testModule.exports;
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}
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module.exports = trick;

‎package.json‎

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{
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"name" : "trick",
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"version" : "0.1.0",
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"description" : "Dependency injection for node.js applications",
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"keywords" : [
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"dependency",
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"injection",
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"mock",
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"unit",
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"test"
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],
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"author" : {
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"name" : "Johannes Ewald",
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"email" : "mail@johannesewald.de",
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"web" : "http://johannesewald.de"
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},
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"main" : "lib/index.js",
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"bugs" : {
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"email" : "mail@johannesewald.de",
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"url" : "https://github.com/jhnns/trick/issues"
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},
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"licenses" : {
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"type" : "MIT",
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"url" : "http: //www.opensource.org/licenses/mit-license.php"
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},
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"repositories" : {
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"type" : "git",
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"url" : "https://github.com/jhnns/trick"
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},
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"engines" : {
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"node" : "0.6.x"
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},
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"dependencies": {
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"toSrc": "0.1.x"
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},
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"devDependencies": {
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"mocha": "1.1.x",
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"expect.js": "0.1.x"
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},
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"scripts" : {
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"test" : "make test"
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}
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}

‎test/getLeakingSrc.test.js‎

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"use strict"; // run code in ES5 strict mode
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var expect = require("expect.js"),
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getLeakingWrapper = require("../lib/getLeakingSrc.js");
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describe("#getLeakingWrapper", function () {
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it("should return 'exports.__ = {};'", function () {
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expect(getLeakingWrapper([])).to.be("exports.__ = {};");
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});
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it("should return 'exports.__ = {somethingPrivate:somethingPrivate,somethingSecret:somethingSecret};'", function () {
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var leakArr = ["somethingPrivate", "somethingSecret"];
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expect(getLeakingWrapper(leakArr))
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.to.be("exports.__ = {somethingPrivate:somethingPrivate,somethingSecret:somethingSecret};");
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});
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});

‎test/getMonkeyPatchSrc.test.js‎

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"use strict"; // run code in ES5 strict mode
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var expect = require("expect.js"),
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getMonkeyPatchSrc = require("../lib/getMonkeyPatchSrc.js");
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describe("#getMonkeyPatchSrc", function () {
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it("should return ''", function () {
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var expectedSrc = "",
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subject = {};
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expect(getMonkeyPatchSrc(subject)).to.be(expectedSrc);
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});
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it("should return 'process.argv=[\"myArg1\", \"myArg2\"];var console=456;'", function () {
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var expectedSrc = "process.argv=[\"myArg1\", \"myArg2\"];var console=456;",
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subject = {
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process: {
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argv: ["myArg1", "myArg2"]
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},
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console: 456
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};
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expect(getMonkeyPatchSrc(subject)).to.be(expectedSrc);
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});
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it("should return 'level1.level2.level3.level4.level5=true;", function () {
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var expectedSrc = "level1.level2.level3.level4.level5=true;",
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subject = {level1: {level2: {level3: {level4: {level5: true}}}}};
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expect(getMonkeyPatchSrc(subject)).to.be(expectedSrc);
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});
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});

‎test/testModules/A/moduleA.js‎

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"use strict"; // run code in ES5 strict mode
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var path = require("path"),
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// different ways to require a module
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fs = require("fs"), // native module
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c = require("../C/moduleC.js"), // relative path
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b = require(path.resolve(__dirname, "../B/moduleB.js")), // absolute path
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toSrc = require("toSrc"), // node_modules path
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index = require("../"); // index.js path
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var myPrivateVar = "Hello I'm very private";
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// expose all required modules to test for mocks
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exports.fs = fs;
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exports.b = b;
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exports.c = c;
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exports.toSrc = toSrc;
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exports.index = index;
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exports.process = process;
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exports.console = console;

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