Added solidityUnit tests

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

-import { NightwatchBrowser } from "nightwatch"
-import EventEmitter from "events"
+import { NightwatchBrowser } from 'nightwatch'
+import EventEmitter from 'events'
 
 class clearEditablecontent extends EventEmitter {
   command (this: NightwatchBrowser, cssSelector): NightwatchBrowser {

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

+import { NightwatchBrowser } from 'nightwatch'
+import EventEmitter from 'events'
+
+class ClickElement extends EventEmitter {
+  command (this: NightwatchBrowser, cssSelector: string, index = 0): NightwatchBrowser {
+    this.api.perform((done) => {
+      _clickElement(this.api, cssSelector, index, () => {
+        done()
+        this.emit('complete')
+      })
+    })
+    return this
+  }
+}
+
+function _clickElement (browser: NightwatchBrowser, cssSelector: string, index: number, cb: VoidFunction) {
+  browser.waitForElementPresent(cssSelector)
+  .execute(function (cssSelector: string, index: number) {
+    const elem = document.querySelectorAll(cssSelector)[index] as HTMLElement
+    
+    elem.click()
+  }, [cssSelector, index], function () {
+    cb()
+  })
+}
+
+module.exports = ClickElement

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

+import { NightwatchBrowser } from "nightwatch"
+import EventEmitter from "events"
+
+class NotContainsText extends EventEmitter {
+  command (this: NightwatchBrowser, cssSelector: string, text: string): NightwatchBrowser {
+    const browser = this.api
+
+    browser.getText(cssSelector, (result) => {
+      if (typeof result.value === 'string' && result.value.includes(text)) return this.api.assert.fail(`${cssSelector} contains ${text}.`)
+      else this.api.assert.ok(true, `${cssSelector} does not contains ${text}.`)
+    })
+    .perform(() => {
+      this.emit('complete')
+    })
+    return this
+  }
+}
+
+module.exports = NotContainsText

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

@@ -45,7 +45,9 @@ declare module "nightwatch" {
         switchBrowserWindow(url: string, windowName: string, cb: (browser: NightwatchBrowser, window?: NightwatchCallbackResult<Window>) => void): NightwatchBrowser,
         setupMetamask(passphrase: string, password: string): NightwatchBrowser,
         signMessage(msg: string, callback: (hash: { value: string }, signature: { value: string }) => void): NightwatchBrowser,
-        setSolidityCompilerVersion(version: string): NightwatchBrowser
+        setSolidityCompilerVersion(version: string): NightwatchBrowser,
+        clickElementAtPosition(cssSelector: string, index: number): NightwatchBrowser,
+        notContainsText(cssSelector: string, text: string): NightwatchBrowser
     }
 
     export interface NightwatchBrowser {