old_contents: import {FilterView} from './filter.view';
  
  describe('FilterView', () => {
  	let columnTest = {
  		key: 'Key'
  	};
  	let model = {
  		filter: () => {return {by: {'Key': null}}}
  	};
  
  	describe('has', () => {
  		it('should return true if model contains given column`s key', () => {
  			let filterView = new FilterView(model);
  			let result = filterView.has(columnTest);
  			expect(result).to.equal(true);
  		});
  	});
  });
  
new_contents: import {FilterView} from './filter.view';
  
  describe('FilterView', () => {
  	let model = {
  		filter: () => {return {by: {'Key': null}}}
  	};
  
  	describe('has', () => {
  		it('should return true if model contains the given column`s key', () => {
  			let columnTest = {
  				key: 'Key'
  			};
  			let filterView = new FilterView(model);
  			let result = filterView.has(columnTest);
  			expect(result).to.equal(true);
  		});
  
  		it('should return false if model does not contains the given column`s key', () => {
  			let columnTest = {
  				key: null
  			};
  			let filterView = new FilterView(model);
  			let result = filterView.has(columnTest);
  			expect(result).to.equal(false);
  		});
  	});
  });
  
subject: Update filter.view.spec.js