- Fix: Avoid errors occurring in Chrome now for supportsGoodTextCharPos

- Linting: Avoid Jamilih file in doc linting
- Testing: Add testcafe (ESLint plugin/rules, accessibility test
  (failing), ui test beginnings (passing))
- Docs: Add "Testing" prefix to contributing file
- npm: Bump to 3.0.0-rc.3

test/ui-tests/ui.js

@@ -0,0 +1,22 @@
+// https://github.com/DevExpress/testcafe
+// https://devexpress.github.io/testcafe/documentation/test-api/
+// https://github.com/helen-dikareva/axe-testcafe
+import {Selector} from 'testcafe';
+
+fixture`TestCafe UI tests`
+  .page`http://localhost:8000/editor/svg-editor.html`;
+
+test('Editor - No parameters: Export button', async t => {
+  await t
+    .click('#dialog_buttons > input[type=button][value=OK]')
+    .click('#main_icon')
+    .expect(Selector('#tool_export')).ok('Has open button');
+});
+
+test('Editor - No parameters: Export button clicking', async t => {
+  await t
+    .click('#dialog_buttons > input[type=button][value=OK]')
+    .click('#main_icon')
+    .click('#tool_export')
+    .expect(Selector('#dialog_content select')).ok('Export dialog opens');
+});