Add UI tests

src/spec/scenarios/searchTree.ts

@@ -0,0 +1,8 @@
+import { clickOn, sleep, writeText } from '../util'
+import { Browser } from 'webdriverio'
+
+export async function searchTree(browser: Browser<void>) {
+  const searchField = await browser.$('//input[contains(@placeholder, "Search")]')
+  await clickOn(searchField, browser, 1)
+  writeText('temp', browser)
+}