Verified non-issue with Sinon and Babel

Ref sinonjs/sinon#1711

It was said that the test failed. It did not, as suspected.

.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["env"]
+}

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+build

lib/mod1.js

@@ -0,0 +1,10 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+function test() {
+  return 'fail';
+}
+
+exports.test = test;

lib/mod1.spec.js

@@ -0,0 +1,38 @@
+"use strict";
+
+var _chai = require("chai");
+
+var _chai2 = _interopRequireDefault(_chai);
+
+var _sinon = require("sinon");
+
+var _sinon2 = _interopRequireDefault(_sinon);
+
+var _mod = require("./mod1");
+
+var mod1 = _interopRequireWildcard(_mod);
+
+function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) newObj[key] = obj[key]; } } newObj.default = obj; return newObj; } }
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var assert = _chai2.default.assert; // mod1Spec.js
+
+
+describe("test", function () {
+  it("should correctly mock module method", function () {
+    _sinon2.default.stub(mod1, "test").returns("pass");
+    assert.strictEqual(mod1.test(), "pass");
+  });
+});
+
+describe("the Module object", function () {
+  it("should have a toStringTag symbol with the expected value", function () {
+    assert.strictEqual(mod1[Symbol.toStringTag], "Module");
+  });
+
+  it("should use the toStringTag symbol", function () {
+    var symbolString = mod1[Symbol.toStringTag];
+    assert.strictEqual(Object.prototype.toString.call(mod1), "[object " + symbolString + "]");
+  });
+});