grafana/public/test/specs/datasource_srv_specs.js

define([
  'app/core/config',
  'app/core/services/datasource_srv'
], function(config) {
  'use strict';

  describe('datasource_srv', function() {
    var _datasourceSrv;
    var metricSources;
    var templateSrv = {};

    beforeEach(module('grafana.core'));
    beforeEach(module(function($provide) {
      $provide.value('templateSrv', templateSrv);
    }));
    beforeEach(module('grafana.services'));
    beforeEach(inject(function(datasourceSrv) {
      _datasourceSrv = datasourceSrv;
    }));

    describe('when loading metric sources', function() {
      var unsortedDatasources = {
        'mmm': {
          type: 'test-db',
          meta: { metrics: {m: 1} }
        },
        '--Mixed--': {
          type: 'test-db',
          meta: {builtIn: true, metrics: {m: 1} }
        },
        'ZZZ': {
          type: 'test-db',
          meta: {metrics: {m: 1} }
        },
        'aaa': {
          type: 'test-db',
          meta: { metrics: {m: 1} }
        },
        'BBB': {
          type: 'test-db',
          meta: { metrics: {m: 1} }
        },
      };
      beforeEach(function() {
        config.datasources = unsortedDatasources;
        metricSources = _datasourceSrv.getMetricSources({skipVariables: true});
      });

      it('should return a list of sources sorted case insensitively with builtin sources last', function() {
        expect(metricSources[0].name).to.be('aaa');
        expect(metricSources[1].name).to.be('BBB');
        expect(metricSources[2].name).to.be('mmm');
        expect(metricSources[3].name).to.be('ZZZ');
        expect(metricSources[4].name).to.be('--Mixed--');
      });
    });
  });
});