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"use strict"; // run code in ES5 strict mode
var path = require("path"),
expect = require("expect.js"),
rewire = require("../lib/index.js");
var testModules = {
A: path.resolve(__dirname, "./testModules/moduleA.js"),
B: path.resolve(__dirname, "./testModules/moduleB.js"),
someOtherModule: path.resolve(__dirname, "./testModules/someOtherModule.js"),
emptyModule: path.resolve(__dirname, "./testModules/emptyModule.js")
};
function cleanRequireCache() {
var moduleName,
modulePath;
for (moduleName in testModules) {
if (testModules.hasOwnProperty(moduleName)) {
modulePath = testModules[moduleName];
delete require.cache[modulePath];
}
}
}
describe("rewire", function () {
beforeEach(cleanRequireCache); // ensuring a clean test environment
it("should work like require()", function () {
expect(rewire("./testModules/moduleA.js")).to.be(require("./testModules/moduleA.js"));
cleanRequireCache();
expect(rewire("../test/testModules/moduleA.js")).to.be(require("../test/testModules/moduleA.js"));
cleanRequireCache();
expect(rewire(testModules.A)).to.be(require(testModules.A));
});
it("should modify the module so it provides a __set__ - function", function () {
expect(rewire(testModules.A).__set__).to.be.a(Function);
expect(rewire(testModules.B).__set__).to.be.a(Function);
});
it("should modify the module so it provides a __get__ - function", function () {
expect(rewire(testModules.A).__get__).to.be.a(Function);
expect(rewire(testModules.B).__get__).to.be.a(Function);
});
it("should not influence other modules", function () {
var rewiredModuleA = rewire(testModules.A);
expect(require(testModules.someOtherModule).__set__).to.be(undefined);
expect(require(testModules.someOtherModule).__get__).to.be(undefined);
expect(require("fs").__set__).to.be(undefined);
expect(require("fs").__get__).to.be(undefined);
});
it("should not influence global objects by default", function () {
expect(function () {
rewire(testModules.A).checkSomeGlobals();
rewire(testModules.B).checkSomeGlobals();
}).to.not.throwException();
});
it("should provide the ability to set private vars", function () {
var rewiredModuleA = rewire(testModules.A),
newObj = {};
expect(rewiredModuleA.getMyNumber()).to.be(0);
rewiredModuleA.__set__("myNumber", 2);
expect(rewiredModuleA.getMyNumber()).to.be(2);
rewiredModuleA.__set__("myObj", newObj);
expect(rewiredModuleA.getMyObj()).to.be(newObj);
});
it("should provide the ability to get private vars", function () {
var rewiredModuleA = rewire(testModules.A);
expect(rewiredModuleA.__get__("myNumber")).to.be(rewiredModuleA.getMyNumber());
expect(rewiredModuleA.__get__("myObj")).to.be(rewiredModuleA.getMyObj());
});
it("should provide the ability to inject mocks", function (done) {
var rewiredModuleA = rewire(testModules.A),
mockedFs = {
readFileSync: function (file) {
expect(file).to.be("bla.txt");
done();
}
};
rewiredModuleA.__set__("fs", mockedFs);
rewiredModuleA.readFileSync();
});
it("should not influence other modules when injecting mocks", function () {
var rewiredModuleA = rewire(testModules.A),
someOtherModule,
mockedFs = {};
rewiredModuleA.__set__("fs", mockedFs);
someOtherModule = require(testModules.someOtherModule);
expect(someOtherModule.fs).not.to.be(mockedFs);
});
it("should provide the ability to mock global objects just within the module", function () {
var rewiredModuleA = rewire(testModules.A),
rewiredModuleB = rewire(testModules.B),
consoleMock = {},
processMock = {},
newFilename = "myFile.js";
rewiredModuleA.__set__({
console: consoleMock,
process: processMock
});
rewiredModuleA.__set__("__filename", newFilename);
rewiredModuleB.__set__({
console: consoleMock,
process: processMock
});
rewiredModuleB.__set__("__filename", newFilename);
expect(rewiredModuleA.getConsole()).to.be(consoleMock);
expect(rewiredModuleB.getConsole()).to.be(consoleMock);
expect(console).not.to.be(consoleMock);
expect(rewiredModuleA.getProcess()).to.be(processMock);
expect(rewiredModuleB.getProcess()).to.be(processMock);
expect(process).not.to.be(processMock);
expect(rewiredModuleA.getFilename()).to.be(newFilename);
expect(rewiredModuleB.getFilename()).to.be(newFilename);
});
it("should cache the rewired module", function () {
var rewired;
rewired = rewire(testModules.someOtherModule);
expect(require(testModules.A).someOtherModule).to.be(rewired);
cleanRequireCache();
rewired = rewire(testModules.someOtherModule, true);
expect(require(testModules.A).someOtherModule).to.be(rewired);
});
it("should not cache the rewired module on demand", function () {
var rewired;
rewired = rewire(testModules.someOtherModule, false);
expect(require(testModules.A).someOtherModule).not.to.be(rewired);
});
it("should not influence the original node require if nothing has been required within the rewired module", function () {
rewire(testModules.emptyModule); // nothing happens here because emptyModule doesn't require anything
expect(require(testModules.A).__set__).to.be(undefined); // if restoring the original node require didn't worked, the module would have a setter
});
it("subsequent calls of rewire should always return a new instance", function () {
expect(rewire(testModules.A)).not.to.be(rewire(testModules.A));
});
describe("#reset", function () {
it("should remove all rewired modules from cache", function () {
var rewiredModuleA = rewire(testModules.A),
rewiredModuleB = rewire(testModules.B);
expect(require(testModules.A)).to.be(rewiredModuleA);
expect(require(testModules.B)).to.be(rewiredModuleB);
rewire.reset();
expect(require(testModules.A)).not.to.be(rewiredModuleA);
expect(require(testModules.B)).not.to.be(rewiredModuleB);
});
});
});
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