undefined is not a function in karma with angular.js

Question

filterTest.js

'use strict';
describe('test the reverse string filter',function(){

  var customFilter;
  beforeEach(module('directiveApp'));
  beforeEach(inject(function($filter){
      customFilter = $filter('reversing');
  }));
  it('passing a filter test',function(){
        expect(customFilter('HELLO')).toBe('OLLEH');
  });
});

filterModule.js

angular.module('directiveApp').filter('reversing',function(text){
  return text.split("").reverse().join("");
});

filterTest.js is my test file in which i am trying to test the filter that i have created in 'directiveApp' module which reverses the string. When i run karma start it was giving an error:

TypeError: undefined is not a function (evaluating 'customFilter('HELLO')') in /var/www/html/Directive/tests/testFilter.js (line 10) /var/www/html/Directive/tests/testFilter.js:10:25

I am unable figure it out, what wrong with it. Any help is appreciated. Thanks,

JB Nizet · Accepted Answer · 2016-02-15 14:43:57Z

1

Your filter is not defined correctly. It should be:

angular.module('directiveApp').filter('reversing', function() {
  return function(text) {
    return text.split("").reverse().join("");
  };
});

answered Feb 15, 2016 at 14:43

JB Nizet

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3 Comments

Ketha Kavya Over a year ago

Even thought i have replaced the with this, its giving the same error.

JB Nizet Over a year ago

It's most probably caused by a karma misconfiguration. Have you configure karma to load your filter JS file?

Ketha Kavya Over a year ago

files: [ 'node_modules/angular/angular.js', 'node_modules/angular-mocks/angular-mocks.js', 'app/*.js', 'test/*.js' ],

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