adding usingWebWorker test

apps/remix-ide/src/app/editor/example-contracts.js

@@ -1,5 +1,15 @@
 'use strict'
 
+const basic = `pragma solidity >=0.2.0 <0.7.0;
+
+/**
+ * @title Basic contract
+ */
+contract Basic {
+    uint someVar;
+    constructor() public {}
+}`
+
 const storage = `pragma solidity >=0.4.22 <0.7.0;
 
 /**
@@ -245,5 +255,6 @@ module.exports = {
   storage: { name: '1_Storage.sol', content: storage },
   owner: { name: '2_Owner.sol', content: owner },
   ballot: { name: '3_Ballot.sol', content: ballot },
-  ballot_test: { name: '4_Ballot_test.sol', content: ballotTest }
+  ballot_test: { name: '4_Ballot_test.sol', content: ballotTest },
+  basic: { name: 'basic.sol', content: basic }
 }

apps/remix-ide/src/app/tabs/compile-tab.js

@@ -411,7 +411,7 @@ class CompileTab extends ViewPlugin {
   render () {
     if (this._view.el) return this._view.el
     this.onActivationInternal()
-    this._view.errorContainer = yo`<div class="${css.errorBlobs} p-4"></div>`
+    this._view.errorContainer = yo`<div class="${css.errorBlobs} p-4" data-id="compiledErrors" ></div>`
     this._view.contractSelection = this.contractSelection()
     this._view.compilerContainer = this.compilerContainer.render()
     this.compilerContainer.activate()

test-browser/tests/usingWebWorker.test.js

@@ -0,0 +1,29 @@
+'use strict'
+var examples = require('../../src/app/editor/example-contracts')
+var init = require('../helpers/init')
+var sauce = require('./sauce')
+
+var sources = [
+  {'browser/basic.sol': {content: examples.basic.content}}
+]
+
+module.exports = {
+  before: function (browser, done) {
+    init(browser, done)
+  },
+  '@sources': function () {
+    return sources
+  },
+  'Using Web Worker': function (browser) {
+    browser
+    .waitForElementVisible('*[data-id="remixIdeIconPanel"]', 10000)
+    .addFile('basic.sol', sources[0]['browser/basic.sol'])
+    .noWorkerErrorFor('soljson-v0.3.4+commit.7dab890.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')
+  },
+
+  tearDown: sauce
+}