mocha should throw error

describe('createMap', () => {
    it('should throw an error if no contents were sent as argument', () => {
      expect(() => createMap()).to.throw('You have to send a list of things to map.');
    });
  });

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Hemant 65 points

                                    expect(model.get.bind(model, 'z')).to.throw('Property does not exist in model schema.');
expect(model.get.bind(model, 'z')).to.throw(new Error('Property does not exist in model schema.'));

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