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10

jasmine: check that an array contains an element with given properties

rated 0 times [ 13] [ 3] / answers: 1 / hits: 21281 / 10 Years ago, sat, june 21, 2014, 12:00:00

I'm using Karma/Jasmine to test a given class. I need to test that an array contains an object with a given property, i.e. I don't want to specify the whole object (it is rather large and the test would become less maintainable if I had to).

I've tried the following:

expect(filters.available).toContain(jasmine.objectContaining({name:majors});

but this gave me the error 'jasmine' is not defined, and I haven't been able to figure out the cause of that error.

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nikhilh

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2 Years ago

answered 10 Years ago mira · Accepted Answer

One way of doing it in jasmine 2.0 is to use a custom matcher. I also used lodash to iterate over the array and inthe objects inside each array item:

'use strict';

var _ = require('lodash');

var customMatcher = {

    toContain : function(util, customEqualityTesters) {

        return {

            compare : function(actual, expected){

                if (expected === undefined) {

                  expected = '';

                }

                var result = {};

                _.map(actual, function(item){

                    _.map(item, function(subItem, key){

                        result.pass = util.equals(subItem,

                        expected[key], customEqualityTesters);

                    });

                });

                if(result.pass){

                    result.message = 'Expected '+ actual + 'to contain '+ expected;

                }

                else{

                    result.message = 'Expected '+ actual + 'to contain '+ expected+' but it was not found';

                }

                return result;

            }

        };

    }

};





describe('Contains object test', function(){

    beforeEach(function(){

        jasmine.addMatchers(customMatcher);

    });



    it('should contain object', function(){

        var filters = {

            available: [

                {'name':'my Name','id':12,'type':'car owner'},

                {'name':'my Name2','id':13,'type':'car owner2'},

                {'name':'my Name4','id':14,'type':'car owner3'},

                {'name':'my Name4','id':15,'type':'car owner5'}

            ]

        };

        expect(filters.available).toContain({name : 'my Name2'});

    });

});