Publish Button test in Jest

package.json

@@ -21,6 +21,9 @@
       "git add"
     ]
   },
+  "jest": {
+    "setupFiles": ["./test/setup-jest.js"]
+  },
   "keywords": [
     "editor",
     "wysiwyg",

test/ui-testing/publishButton.test.js

@@ -3,12 +3,18 @@ const fs = require('fs');
 beforeAll(async () => {
   path = fs.realpathSync('file://../examples/index.html');
   await page.goto('file://' + path, {waitUntil: 'domcontentloaded'});
+  await page.waitForSelector('body');
+  await page.addScriptTag({url: 'https://code.jquery.com/jquery-3.2.1.min.js'});
 });
 
 describe('Publish button', () => {
-
-  test('something we are testing described here', () => {
-
-  });
-
+  test('publish button gets enabled', () => {
+    // Check initially that Publish button is disabled.
+    expect(page.$('.ple-publish').getAttribute('disabled')).toBe(true);
+    // Add title.
+    page.$('.ple-module-title input').innerText.toBe('Title');
+    page.type('.ple-module-title input', 'hello');
+    // Check final state of Publish button.
+    expect(page.$('.ple-publish').getAttribute('disabled')).toBe(false);
+  }, timeout);
 });