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// Don't run code in ES5 strict mode.
// In case this module was in strict mode, all other modules called by this would also be strict.
// But when testing if the strict mode is preserved, we must ensure that this module is NOT strict.
var path = require("path"),
expect = require("expect.js"),
rewire = require("../");
function checkForTypeError(err) {
expect(err.constructor).to.be(TypeError);
}
describe("rewire", function () {
it("should work like require()", function () {
rewire("./testModules/moduleA.js").getFilename();
require("./testModules/moduleA.js").getFilename();
expect(rewire("./testModules/moduleA.js").getFilename()).to.eql(require("./testModules/moduleA.js").getFilename());
expect(rewire("./testModules/someOtherModule.js").filename).to.eql(require("./testModules/someOtherModule.js").filename);
});
it("should return a fresh instance of the module", function () {
var someOtherModule = require("./testModules/someOtherModule.js"),
rewiredSomeOtherModule;
someOtherModule.fs = "This has been modified";
rewiredSomeOtherModule = rewire("./testModules/someOtherModule.js");
expect(rewiredSomeOtherModule.fs).not.to.be("This has been modified");
});
it("should not cache the rewired module", function () {
var rewired,
someOtherModule = require("./testModules/someOtherModule.js");
someOtherModule.fs = "This has been changed";
rewired = rewire("./testModules/someOtherModule.js");
expect(someOtherModule).not.to.be(rewired);
expect(require("./testModules/moduleA.js").someOtherModule).not.to.be(rewired);
expect(require("./testModules/moduleA.js").someOtherModule).to.be(someOtherModule);
expect(require("./testModules/moduleA.js").someOtherModule.fs).to.be("This has been changed");
});
it("should modify the module so it provides a __set__ - function", function () {
expect(rewire("./testModules/moduleA.js").__set__).to.be.a(Function);
expect(rewire("./testModules/moduleB.js").__set__).to.be.a(Function);
});
it("should modify the module so it provides a __get__ - function", function () {
expect(rewire("./testModules/moduleA.js").__get__).to.be.a(Function);
expect(rewire("./testModules/moduleB.js").__get__).to.be.a(Function);
});
it("should not influence other modules", function () {
var rewiredModuleA = rewire("./testModules/moduleA.js");
expect(require("./testModules/someOtherModule.js").__set__).to.be(undefined);
expect(require("./testModules/someOtherModule.js").__get__).to.be(undefined);
});
it("should not override/influence global objects by default", function () {
// This should throw no exception
rewire("./testModules/moduleA.js").checkSomeGlobals();
rewire("./testModules/moduleB.js").checkSomeGlobals();
});
it("should provide the ability to set private vars", function () {
var rewiredModuleA = rewire("./testModules/moduleA.js"),
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);
rewiredModuleA.__set__("env", "ENVENV");
});
it("should provide the ability to get private vars", function () {
var rewiredModuleA = rewire("./testModules/moduleA.js");
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/moduleA.js"),
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/moduleA.js"),
someOtherModule,
mockedFs = {};
rewiredModuleA.__set__("fs", mockedFs);
someOtherModule = require("./testModules/someOtherModule.js");
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/moduleA.js"),
rewiredModuleB = rewire("./testModules/moduleB.js"),
consoleMock = {},
bufferMock = {},
documentMock = {},
newFilename = "myFile.js";
rewiredModuleA.__set__({
console: consoleMock,
__filename: newFilename
});
expect(rewiredModuleA.getConsole()).to.be(consoleMock);
expect(rewiredModuleB.getConsole()).not.to.be(consoleMock);
expect(console).not.to.be(consoleMock);
expect(rewiredModuleA.getFilename()).to.be(newFilename);
expect(rewiredModuleB.getFilename()).not.to.be(newFilename);
expect(console).not.to.be(newFilename);
if (typeof window === "undefined") {
rewiredModuleA.__set__("Buffer", bufferMock);
expect(rewiredModuleA.getBuffer()).to.be(bufferMock);
expect(rewiredModuleB.getBuffer()).not.to.be(bufferMock);
expect(Buffer).not.to.be(bufferMock);
} else {
rewiredModuleA.__set__("document", documentMock);
expect(rewiredModuleA.getDocument()).to.be(documentMock);
expect(rewiredModuleB.getDocument() === documentMock).to.be(false);
expect(document === documentMock).to.be(false);
}
});
it("should be possible to mock global objects that are added on runtime", function () {
var rewiredModule;
if (typeof window === "undefined") {
global.someGlobalVar = "test";
rewiredModule = rewire("./testModules/moduleA.js");
rewiredModule.__set__("someGlobalVar", "other value");
expect(global.someGlobalVar).to.be("test");
expect(rewiredModule.__get__("someGlobalVar")).to.be("other value");
delete global.someGlobalVar;
} else {
window.someGlobalVar = "test";
rewiredModule = rewire("./testModules/moduleA.js");
rewiredModule.__set__("someGlobalVar", "other value");
expect(window.someGlobalVar).to.be("test");
expect(rewiredModule.__get__("someGlobalVar")).to.be("other value");
if (typeof navigator !== "undefined" && /MSIE [6-8]\.[0-9]/g.test(navigator.userAgent) === false) {
delete window.someGlobalVar;
}
}
});
it("should not be a problem to have a comment on file end", function () {
var rewired = rewire("./testModules/emptyModule.js");
rewired.__set__("someVar", "hello");
expect(rewired.__get__("someVar")).to.be("hello");
});
it("should not influence the original require if nothing has been required within the rewired module", function () {
rewire("./testModules/emptyModule.js"); // nothing happens here because emptyModule doesn't require anything
expect(require("./testModules/moduleA.js").__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/moduleA.js")).not.to.be(rewire("./testModules/moduleA.js"));
});
it("should preserve the strict mode (not IE)", function () {
var strictModule = rewire("./testModules/strictModule.js");
expect(function () {
strictModule.doSomethingUnstrict();
}).to.throwException(checkForTypeError);
});
it("should not modify line numbers in stack traces", function () {
var throwError = rewire("./testModules/throwError.js");
try {
throwError();
} catch (err) {
if (err.stack) {
expect(err.stack.split("\n")[1]).to.match(/:2:11/);
}
}
});
});
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