Add tests

Fixes #5586

src/ui/public/utils/__tests__/scanner.js

@@ -0,0 +1,63 @@
+var Scanner = require('ui/utils/scanner');
+var expect = require('expect.js');
+var elasticsearch = require('elasticsearch-browser');
+var sinon = require('sinon');
+
+var es = new elasticsearch.Client({
+  host: 'http://localhost:9210',
+});
+
+
+describe('Scanner', function () {
+  describe('initialization', function () {
+    it('should throw errors if missing arguments on initialization', function () {
+      expect(() => new Scanner()).to.throwError();
+      expect(() => new Scanner(es)).to.throwError();
+      expect(() => new Scanner(es, {
+        index: 'foo',
+        type: 'bar'
+      })).not.to.throwError();
+    });
+  });
+
+  describe('scan', function () {
+    let search;
+    let scroll;
+    let scanner;
+    let mockSearch = {'_scroll_id':'abc','took':1,'timed_out':false,'_shards':{'total':1,'successful':1,'failed':0},'hits':{'total':2,'max_score':0.0,'hits':[]}}; // eslint-disable-line max-len
+    let mockScroll = {'took':1,'timed_out':false,'_shards':{'total':1,'successful':1,'failed':0},'hits':{'total':2,'max_score':0.0,'hits':['one', 'two']}}; // eslint-disable-line max-len
+
+    beforeEach(function () {
+      scanner = new Scanner(es, {
+        index: 'foo',
+        type: 'bar'
+      });
+      search = sinon.stub(scanner.client, 'search', (req, cb) => cb(null, mockSearch));
+      scroll = sinon.stub(scanner.client, 'scroll', (req, cb) => cb(null, mockScroll));
+    });
+
+    it('should search and then scroll for results', function () {
+      return scanner.scanAndMap('')
+      .then(function (error, response) {
+        expect(search.called).to.be(true);
+        expect(scroll.called).to.be(true);
+      });
+    });
+
+    it('should map results if a function is provided', function () {
+      return scanner.scanAndMap(null, null, function (hit) {
+        return hit.toUpperCase();
+      })
+      .then(function (response) {
+        expect(response.hits[0]).to.be('ONE');
+        expect(response.hits[1]).to.be('TWO');
+      });
+    });
+
+    afterEach(function () {
+      search.restore();
+      scroll.restore();
+    });
+  });
+
+});

src/ui/public/utils/scanner.js

@@ -1,6 +1,6 @@
 const _ = require('lodash');
 
-let Scanner = function (client, {index, type}) {
+let Scanner = function (client, {index, type} = {}) {
   if (!index) throw new Error('Expected index');
   if (!type) throw new Error('Expected type');
   if (!client) throw new Error('Expected client');