Testing Filters

Filters are functions which transform the data into a user readable format. They are important because they remove the formatting responsibility from the application logic, further simplifying the application logic.

myModule.filter(‘length’, function() {

return function(text) {

return (” + (text || ”)).length;

}

});

describe(‘length filter’, function() {

var $filter;

beforeEach(inject(function(_$filter_){

$filter = _$filter_;

}));

it(‘returns 0 when given null’, function() {

var length = $filter(‘length’);

expect(length(null)).toEqual(0);

});

it(‘returns the correct value when given a string of chars’, function() {

var length = $filter(‘length’);

expect(length(‘abc’)).toEqual(3);

});

});