add tests

Author: wxiaoguang

web_src/js/features/common-button.test.ts

@@ -0,0 +1,14 @@
+import {assignElementProperty} from './common-button.ts';
+
+test('assignElementProperty', () => {
+  const elForm = document.createElement('form');
+  assignElementProperty(elForm, 'action', '/test-link');
+  expect(elForm.action).contains('/test-link'); // the DOM always returns absolute URL
+  assignElementProperty(elForm, 'text-content', 'dummy');
+  expect(elForm.textContent).toBe('dummy');
+
+  const elInput = document.createElement('input');
+  expect(elInput.readOnly).toBe(false);
+  assignElementProperty(elInput, 'read-only', 'true');
+  expect(elInput.readOnly).toBe(true);
+});

web_src/js/features/common-button.ts

@@ -102,7 +102,7 @@ function onHidePanelClick(el: HTMLElement, e: MouseEvent) {
   throw new Error('no panel to hide'); // should never happen, otherwise there is a bug in code
 }
 
-function assignElementProperty(el: any, name: string, val: string) {
+export function assignElementProperty(el: any, name: string, val: string) {
   name = camelize(name);
   const old = el[name];
   if (typeof old === 'boolean') {