Using should.js how can I test for an empty object? - node.js

user1Stats.should.be.instanceof(Object);
(user1Stats).should.have.keys();
I get the following error:
Error: keys required
at Object.Assertion.keys
The instanceof(Object) works, but I want to make sure there is no data in it.

user1Stats.should.be.an.Object();
user1Stats.should.be.empty();
or, using .and to chain both asserts:
user1Stats.should.be.an.Object().and.be.empty();
P.S. By the way, your code also looks fine.

I check for the variable not being empty by using "should" this way:
user1Stats.should.be.empty();

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