fix sinon desperation (#209)

Author: iyuq

package.json

@@ -22,7 +22,7 @@
     "mocha": "^3.0.2",
     "mocha-sinon": "^2.0.0",
     "should": "^11.1.0",
-    "sinon": "^2.3.5",
+    "sinon": "^2.3.8",
     "supertest": "^3.0.0",
     "webpack": "^3.0.0"
   },

test/CompilerCallbacks.test.js

@@ -16,7 +16,7 @@ describe("CompilerCallbacks", function() {
 
 	it("watch error should be reported to console", function(done) {
 		var error = new Error("Oh noes!");
-		this.sinon.stub(compiler, "watch", function(opts, callback) {
+		this.sinon.stub(compiler, "watch").callsFake(function(opts, callback) {
 			callback(error);
 		});
 		this.sinon.stub(console, "error");
@@ -27,7 +27,7 @@ describe("CompilerCallbacks", function() {
 	});
 
 	it("options.error should be used on watch error", function(done) {
-		this.sinon.stub(compiler, "watch", function(opts, callback) {
+		this.sinon.stub(compiler, "watch").callsFake(function(opts, callback) {
 			callback(new Error("Oh noes!"));
 		});
 		middleware(compiler, {