// To have all keys
expect({id: 1, name: 'James'}).to.have.all.keys(['id', 'name']);
// To have at least these keys
expect({id: 1, name: 'James'}).to.have.keys(['id', 'name']);
// To have at least one of these keys
expect({id: 1, name: 'James'}).to.have.any.keys(['id', 'name']);