trim down test harness, remove StackTraceMapper (#8146)

package.json

@@ -163,7 +163,6 @@
   },
   "devDependencies": {
     "@elastic/eslint-config-kibana": "0.0.3",
-    "Nonsense": "0.1.2",
     "angular-mocks": "1.4.7",
     "auto-release-sinon": "1.0.3",
     "babel-eslint": "4.1.8",

src/ui/public/test_harness/test_harness.js

@@ -1,58 +1,23 @@
-/* global mocha */
-
 // chrome expects to be loaded first, let it get its way
 import chrome from 'ui/chrome';
 
-import Nonsense from 'Nonsense';
 import sinon from 'sinon';
-import _ from 'lodash';
 import Notifier from 'ui/notify/notifier';
-
-import StackTraceMapper from 'ui/stack_trace_mapper';
-import { parse } from 'url';
-import $ from 'jquery';
 import { setupAutoRelease } from 'auto-release-sinon';
+
 import './test_harness.less';
 import 'ng_mock';
 import { setupTestSharding } from './test_sharding';
 
-/*** the vislib tests have certain style requirements, so lets make sure they are met ***/
-$('body').attr('id', 'test-harness-body'); // so we can make high priority selectors
-
-
-/*** Setup seeded random ***/
-let seedInput = parse(window.location.href, true).query.seed;
-let seed = _.add(seedInput, 0) || Date.now();
-Math.random = _.bindKey(new Nonsense(seed), 'frac');
-Math.random.nonsense = new Nonsense(seed);
-console.log('Random-ness seed: ' + seed);
-
 // Setup auto releasing stubs and spys
 setupAutoRelease(sinon, window.afterEach);
 setupTestSharding();
 
-/*** manually map error stack traces using the sourcemap ***/
-before(function () {
-  // before the tests start, load the sourcemap and hook into error generation for the mocha reporter
-  this.timeout(30000);
+// allows test_harness.less to have higher priority selectors
+document.body.setAttribute('id', 'test-harness-body');
 
-  let mapper;
-  let Runner = window.Mocha.Runner;
-
-  Runner.prototype.emit = _.wrap(Runner.prototype.emit, function (emit, event, test, err) {
-    if (err && mapper) err = mapper.mapError(err);
-    return emit.call(this, event, test, err);
-  });
-
-  return StackTraceMapper.getInstance({
-    '/bundles/tests.bundle.js': '/bundles/tests.bundle.js.map'
-  }).then(function (instance) {
-    mapper = instance;
-  });
-});
-
-
-before(function () {
+// prevent accidental ajax requests
+before(() => {
   sinon.useFakeXMLHttpRequest();
 });
 
@@ -63,8 +28,7 @@ beforeEach(function () {
   }
 });
 
-
-/*** Kick off mocha, called at the end of test entry files ***/
-exports.bootstrap = function () {
+// Kick off mocha, called at the end of test entry files
+exports.bootstrap = () => {
   chrome.setupAngular();
 };