Added usingWorker tests

apps/remix-ide-e2e/src/commands/noWorkerErrorFor.ts

+import { NightwatchBrowser } from "nightwatch"
+import EventEmitter from "events"
+
+class NoWorkerErrorFor extends EventEmitter {
+  command (this: NightwatchBrowser, version: string): NightwatchBrowser {
+    this.api.perform((done: VoidFunction) => {
+      noWorkerErrorFor(this.api, version, () => {
+        done()
+        this.emit('complete')
+      })
+    })
+    return this
+  }
+}
+
+function noWorkerErrorFor (browser: NightwatchBrowser, version: string, callback: VoidFunction) {
+  browser
+    .setSolidityCompilerVersion(version)
+    .click('*[data-id="compilerContainerCompileBtn"]')
+    .waitForElementPresent('*[data-id="compilationFinishedWith_' + version + '"]', 10000)
+    .notContainsText('*[data-id="compiledErrors"]', 'worker error:undefined')
+    .notContainsText('*[data-id="compiledErrors"]', 'Uncaught RangeError: Maximum call stack size exceeded')
+    .notContainsText('*[data-id="compiledErrors"]', 'RangeError: Maximum call stack size exceeded')
+    .perform(() => {
+      callback()
+    })
+}
+
+module.exports = NoWorkerErrorFor

apps/remix-ide-e2e/src/tests/usingWebWorker.test.ts

+'use strict'
+import init from '../helpers/init'
+import sauce from './sauce'
+import { NightwatchBrowser } from 'nightwatch'
+
+const sources = [
+  {'browser/basic.sol': { content:
+    `pragma solidity >=0.2.0 <0.7.0;
+
+    /**
+     * @title Basic contract
+     */
+    contract Basic {
+        uint someVar;
+        constructor() public {}
+    }`
+  }}
+]
+
+module.exports = {
+  before: function (browser: NightwatchBrowser, done: VoidFunction) {
+    init(browser, done)
+  },
+  '@sources': function () {
+    return sources
+  },
+  'Using Web Worker': function (browser: NightwatchBrowser) {
+    browser
+    .waitForElementVisible('*[data-id="remixIdeIconPanel"]', 10000)
+    .clickLaunchIcon('fileExplorers')
+    .addFile('browser/basic.sol', sources[0]['browser/basic.sol'])
+    .clickLaunchIcon('solidity')
+    .execute(function() {
+      const elem = document.getElementById('nightlies') as HTMLInputElement
+      
+      elem.checked = true
+    })
+    .noWorkerErrorFor('soljson-v0.3.4+commit.7dab8902.js')
+    .noWorkerErrorFor('soljson-v0.6.5+commit.f956cc89.js')
+    .noWorkerErrorFor('soljson-v0.6.8-nightly.2020.5.14+commit.a6d0067b.js')
+    .noWorkerErrorFor('soljson-v0.6.0-nightly.2019.12.17+commit.d13438ee.js')
+    .noWorkerErrorFor('soljson-v0.4.26+commit.4563c3fc.js')
+    .execute(function() {
+      const elem = document.getElementById('nightlies') as HTMLInputElement
+      
+      elem.checked = false
+    })
+    .end()
+  },
+
+  tearDown: sauce
+}

apps/remix-ide-e2e/src/types/index.d.ts

@@ -50,7 +50,8 @@ declare module "nightwatch" {
         notContainsText(cssSelector: string, text: string): NightwatchBrowser,
         sendLowLevelTx(address: string, value: string, callData: string): NightwatchBrowser,
         journalLastChild(val: string): NightwatchBrowser,
-        checkTerminalFilter(filter: string, test: string): NightwatchBrowser
+        checkTerminalFilter(filter: string, test: string): NightwatchBrowser,
+        noWorkerErrorFor(version: string): NightwatchBrowser
     }
 
     export interface NightwatchBrowser {