Basically i have to test this below function, where i'm reading from text file
$window.resolveLocalFileSystemURL(cordova.file.dataDirectory, function (dir) { var path = 'somefile.txt'; dir.getFile(path, { create: true }, function (file) { file.file(function (file) { var reader = new FileReader(); reader.onloadend = function () { resolve(this.result); } reader.readAsText(file); }); }, error); }, error); i'm stuck in writing the unit test cases for reading file
describe('get data from file', function () { it('should read the files from the data', function () { var syncFile = 'somefile.txt'; expect( ).toBe( ); }); }); How to write unit test for filereader for reading the file? PS : i'm new to unit testing using karma
1 Answers
Answers 1
You should not use FileReader directly. Change that line to
var reader = new $window.FileReader(); In your test mock the $window and return a custom FileReader object. Then do the tests on that. Something like below.
describe('get data from file', function () { var $window, fileReader; beforeEach(function () { inject(function (_$window_) { $window = _$window_; }); fileReader = function () { return {}; }; spyOn($window, "FileReader").and.returnValue(fileReader); }); it('should read the files from the data', function () { var syncFile = 'somefile.txt'; expect($window.FileReader).toHaveBeenCalled(); }); }); 
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