it('should dispose of the resources held by the document manager', () => {
let model = new DocumentModel();
model.dispose();
expect(model.isDisposed).to.be(true);
});
it('should be safe to call more than once', () => {
let model = new DocumentModel();
model.dispose();
model.dispose();
expect(model.isDisposed).to.be(true);
});
it('should get whether the model has been disposed', () => {
let model = new DocumentModel();
expect(model.isDisposed).to.be(false);
model.dispose();
expect(model.isDisposed).to.be(true);
});