filterSpec.js

'use strict';

describe('Filter: filter', function() {
  var filter;

  beforeEach(inject(function($filter){
    filter = $filter('filter');
  }));

  it('should filter by string', function() {
    var items = ['MIsKO', {name: 'shyam'}, ['adam'], 1234];
    expect(filter(items, '').length).toBe(4);
    expect(filter(items, undefined).length).toBe(4);

    expect(filter(items, 'iSk').length).toBe(1);
    expect(filter(items, 'isk')[0]).toBe('MIsKO');

    expect(filter(items, 'yam').length).toBe(1);
    expect(filter(items, 'yam')[0]).toEqual(items[1]);

    expect(filter(items, 'da').length).toBe(1);
    expect(filter(items, 'da')[0]).toEqual(items[2]);

    expect(filter(items, '34').length).toBe(1);
    expect(filter(items, '34')[0]).toBe(1234);

    expect(filter(items, "I don't exist").length).toBe(0);
  });

  it('should not read $ properties', function() {
    expect(''.charAt(0)).toBe(''); // assumption

    var items = [{$name: 'misko'}];
    expect(filter(items, 'misko').length).toBe(0);
  });

  it('should filter on specific property', function() {
    var items = [{ignore: 'a', name: 'a'}, {ignore: 'a', name: 'abc'}];
    expect(filter(items, {}).length).toBe(2);

    expect(filter(items, {name: 'a'}).length).toBe(2);

    expect(filter(items, {name: 'b'}).length).toBe(1);
    expect(filter(items, {name: 'b'})[0].name).toBe('abc');
  });

  it('should take function as predicate', function() {
    var items = [{name: 'a'}, {name: 'abc', done: true}];
    expect(filter(items, function(i) {return i.done;}).length).toBe(1);
  });

  it('should take object as perdicate', function() {
    var items = [{first: 'misko', last: 'hevery'},
                 {first: 'adam', last: 'abrons'}];

    expect(filter(items, {first:'', last:''}).length).toBe(2);
    expect(filter(items, {first:'', last:'hevery'}).length).toBe(1);
    expect(filter(items, {first:'adam', last:'hevery'}).length).toBe(0);
    expect(filter(items, {first:'misko', last:'hevery'}).length).toBe(1);
    expect(filter(items, {first:'misko', last:'hevery'})[0]).toEqual(items[0]);
  });

  it('should match any properties for given "$" property', function() {
    var items = [{first: 'tom', last: 'hevery'},
                 {first: 'adam', last: 'hevery', alias: 'tom', done: false},
                 {first: 'john', last: 'clark', middle: 'tommy'}];
    expect(filter(items, {$: 'tom'}).length).toBe(3);
    expect(filter(items, {$: 'a'}).length).toBe(2);
    expect(filter(items, {$: false}).length).toBe(1);
    expect(filter(items, {$: 10}).length).toBe(0);
    expect(filter(items, {$: 'hevery'})[0]).toEqual(items[0]);
  });

  it('should support boolean properties', function() {
    var items = [{name: 'tom', current: true},
	             {name: 'demi', current: false},
	             {name: 'sofia'}];

    expect(filter(items, {current:true}).length).toBe(1);
    expect(filter(items, {current:true})[0].name).toBe('tom');
    expect(filter(items, {current:false}).length).toBe(1);
    expect(filter(items, {current:false})[0].name).toBe('demi');
  });

  it('should support negation operator', function() {
    var items = ['misko', 'adam'];

    expect(filter(items, '!isk').length).toBe(1);
    expect(filter(items, '!isk')[0]).toEqual(items[1]);
  });

  describe('should support comparator', function() {

    it('as equality when true', function() {
      var items = ['misko', 'adam', 'adamson'];
      var expr = 'adam';
      expect(filter(items, expr, true)).toEqual([items[1]]);
      expect(filter(items, expr, false)).toEqual([items[1], items[2]]);

      var items = [
        {key: 'value1', nonkey: 1},
        {key: 'value2', nonkey: 2},
        {key: 'value12', nonkey: 3},
        {key: 'value1', nonkey:4},
        {key: 'Value1', nonkey:5}
      ];
      var expr = {key: 'value1'};
      expect(filter(items, expr, true)).toEqual([items[0], items[3]]);

      var items = [
        {key: 1, nonkey: 1},
        {key: 2, nonkey: 2},
        {key: 12, nonkey: 3},
        {key: 1, nonkey:4}
      ];
      var expr = { key: 1 };
      expect(filter(items, expr, true)).toEqual([items[0], items[3]]);

      var expr = 12;
      expect(filter(items, expr, true)).toEqual([items[2]]);
    });

    it('and use the function given to compare values', function() {
      var items = [
        {key: 1, nonkey: 1},
        {key: 2, nonkey: 2},
        {key: 12, nonkey: 3},
        {key: 1, nonkey:14}
      ];
      var expr = {key: 10};
      var comparator = function (obj,value) {
        return obj > value;
      }
      expect(filter(items, expr, comparator)).toEqual([items[2]]);

      expr = 10;
      expect(filter(items, expr, comparator)).toEqual([items[2], items[3]]);

    });


  });

});