define([
  'lodash',
  'app/features/panellinks/linkSrv'
], function(_) {
  'use strict';

  describe('linkSrv', function() {
    var _linkSrv;

    beforeEach(module('grafana.core'));
    beforeEach(module('grafana.services'));

    beforeEach(inject(function(linkSrv) {
      _linkSrv = linkSrv;
    }));

    describe('when appending query strings', function() {

      it('add ? to URL if not present', function() {
        var url = _linkSrv.appendToQueryString('http://example.com', 'foo=bar');
        expect(url).to.be('http://example.com?foo=bar');
      });

      it('do not add & to URL if ? is present but query string is empty', function() {
        var url = _linkSrv.appendToQueryString('http://example.com?', 'foo=bar');
        expect(url).to.be('http://example.com?foo=bar');
      });

      it('add & to URL if query string is present', function() {
        var url = _linkSrv.appendToQueryString('http://example.com?foo=bar', 'hello=world');
        expect(url).to.be('http://example.com?foo=bar&hello=world');
      });

      it('do not change the URL if there is nothing to append', function() {
        _.each(['', undefined, null], function(toAppend) {
          var url1 = _linkSrv.appendToQueryString('http://example.com', toAppend);
          expect(url1).to.be('http://example.com');

          var url2 = _linkSrv.appendToQueryString('http://example.com?', toAppend);
          expect(url2).to.be('http://example.com?');

          var url3 = _linkSrv.appendToQueryString('http://example.com?foo=bar', toAppend);
          expect(url3).to.be('http://example.com?foo=bar');
        });
      });

    });

  });

});