Fix the test assertion as the error message is changed.

test/user.test.js

@@ -40,11 +40,16 @@ describe('User', function(){
 
     it('Email is required', function (done) {
       User.create({password: '123'}, function (err) {
-        assert.deepEqual(err, { name: 'ValidationError',
-          message: 'Validation error',
-          statusCode: 400,
-          codes: { email: [ 'presence', 'format.blank', 'uniqueness' ] },
-          context: 'user' });
+        assert.deepEqual(err, {name: "ValidationError",
+            message: "The Model instance is not valid. See `details` "
+              + "property of the error object for more info.",
+            statusCode: 422,
+            details: {
+              context: "user",
+              codes: {email: ["presence", "format.blank", "uniqueness"]},
+              messages: {email: ["can't be blank", "is blank",
+                "Email already exists"]}}}
+        );
 
         done();
       });