Simple, intuitive mocking of Node.js modules. 

boblauer

mock-require

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const getCallerFile = require('get-caller-file');

const normalize = require('normalize-path');

Module._load = function(request, parent) {

  if (!parent) return originalLoader.apply(this, arguments);

  const fullFilePath = getFullPath(request, parent.filename);

  const fullFilePath = getFullPathNormalized(request, parent.filename);

  if (pendingMockExports.hasOwnProperty(fullFilePath)) {

    mockExports[fullFilePath] = typeof pendingMockExports[fullFilePath] === 'string' ?

      require(pendingMockExports[fullFilePath]) :

    delete pendingMockExports[fullFilePath];

  return mockExports.hasOwnProperty(fullFilePath)

    : originalLoader.apply(this, arguments);

function startMocking(path, mockExport) {

    mockExport = getFullPath(mockExport, calledFrom);

    mockExport = getFullPathNormalized(mockExport, calledFrom);

  pendingMockExports[getFullPath(path, calledFrom)] = mockExport;

  pendingMockExports[getFullPathNormalized(path, calledFrom)] = mockExport;

  const fullPath = getFullPath(path, calledFrom);

  const fullPath = getFullPathNormalized(path, calledFrom);

  const module = getFullPath(path, getCallerFile());

  const module = getFullPathNormalized(path, getCallerFile());

  delete require.cache[require.resolve(module)];

      return resolve(process.cwd(), nodePath) + '/';

      return resolvedPath.indexOf(fullNodePath) === 0;

    resolvedPath = require.resolve(path);

  const isLocalModule = /^\.{1,2}[/\\]?/.test(path);

  const isInPath = isInNodePath(resolvedPath);

  const isExternal = !isLocalModule && /[/\\]node_modules[/\\]/.test(resolvedPath);

  const isSystemModule = resolvedPath === path;

  if (isExternal || isSystemModule || isInPath) {

  const localModuleName = join(dirname(calledFrom), path);

    return Module._resolveFilename(localModuleName);

    if (isModuleNotFoundError(e)) { return localModuleName; } else { throw e; }

function getFullPathNormalized(path, calledFrom) {

  return normalize(getFullPath(path, calledFrom));

  return e.code && e.code === 'MODULE_NOT_FOUND';

  "description": "Simple, intuitive mocking of Node.js modules.",

    "test": "NODE_PATH=test/node-path mocha ./test/runner"

    "url": "https://github.com/boblauer/mock-require.git"

  "author": "Bob Lauer <rlauer@gmail.com>",

    "url": "https://github.com/boblauer/mock-require/issues"

  "homepage": "https://github.com/boblauer/mock-require",

  it('should mock a required function', () => {

    assert.equal(require('./exported-fn')(), 'mocked fn');

  it('should mock a required object', () => {

    assert.equal(obj.fn(), 'mocked obj');

    assert.equal(obj.fn(), 'exported object');

    assert.equal(fn(), 'exported function');

    assert.equal(require('.').mocked, true);

  it('should mock a standard lib', () => {

  it('should mock an external lib', () => {

  it('should one lib with another', () => {

    assert.equal(require('fs'), require('path'));

    mock('./exported-fn', './exported-obj');

    assert.equal(require('./exported-fn'), require('./exported-obj'));

  it('should support re-requiring', () => {

    assert.equal(mock.reRequire('.'), 'root');

  it('should never require the real lib when mocking it', () => {

  it('should mock libs required elsewhere', () => {

  it('should only load the mocked lib when it is required', () => {

    mock('./throw-exception', './throw-exception-when-required');

      require('./throw-exception-runner');

      throw new Error('this line should never be executed.');

      assert.equal(error.message, 'this should run when required');

  it('should mock files in the node path by the full path', () => {

    assert.equal(process.env.NODE_PATH, 'test/node-path');

    assert.equal(normalize(process.env.NODE_PATH), 'test/node-path');

    mock('in-node-path', { id: 'in-node-path' });

    const c = require('./node-path/in-node-path');

		{
		"name": "mock-require",
		"version": "3.0.1",
		"version": "3.0.2",
		"description": "Simple, intuitive mocking of Node.js modules.",
		@@ -10,3 +10,4 @@ "main": "index.js",
		"dependencies": {
		"get-caller-file": "^1.0.2"
		"get-caller-file": "^1.0.2",
		"normalize-path": "^2.1.1"
		},
		@@ -13,0 +14,0 @@ "devDependencies": {

Improved metrics

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Dependency changes

		@@ -8,2 +8,3 @@ 'use strict';
		const getCallerFile = require('get-caller-file');
		const normalize = require('normalize-path');
		const originalLoader = Module._load;
		@@ -17,3 +18,3 @@

		const fullFilePath = getFullPath(request, parent.filename);
		const fullFilePath = getFullPathNormalized(request, parent.filename);

		@@ -37,6 +38,6 @@ if (pendingMockExports.hasOwnProperty(fullFilePath)) {
		if (typeof mockExport === 'string') {
		mockExport = getFullPath(mockExport, calledFrom);
		mockExport = getFullPathNormalized(mockExport, calledFrom);
		}

		pendingMockExports[getFullPath(path, calledFrom)] = mockExport;
		pendingMockExports[getFullPathNormalized(path, calledFrom)] = mockExport;
		}
		@@ -46,3 +47,3 @@
		const calledFrom = getCallerFile();
		const fullPath = getFullPath(path, calledFrom);
		const fullPath = getFullPathNormalized(path, calledFrom);
		delete pendingMockExports[fullPath];
		@@ -58,3 +59,3 @@ delete mockExports[fullPath];
		function reRequire(path) {
		const module = getFullPath(path, getCallerFile());
		const module = getFullPathNormalized(path, getCallerFile());
		delete require.cache[require.resolve(module)];
		@@ -105,2 +106,6 @@ return require(module);

		function getFullPathNormalized(path, calledFrom) {
		return normalize(getFullPath(path, calledFrom));
		}

		function isModuleNotFoundError(e) {
		@@ -107,0 +112,0 @@ return e.code && e.code === 'MODULE_NOT_FOUND';

		'use strict';

		const assert = require('assert');
		const normalize = require('normalize-path');
		const mock = require('..');
		@@ -183,3 +184,3 @@
		it('should mock files in the node path by the full path', () => {
		assert.equal(process.env.NODE_PATH, 'test/node-path');
		assert.equal(normalize(process.env.NODE_PATH), 'test/node-path');

		@@ -196,2 +197,2 @@ mock('in-node-path', { id: 'in-node-path' });
		});
		});
		});