test: add tests for focusElement

src/tests/helpers/focus-element.test.ts

@@ -0,0 +1,25 @@
+import { expect, fixture, html } from '@open-wc/testing';
+
+import { focusElement } from '../../helpers/focus-element';
+
+describe(focusElement.name, () => {
+  it('focuses element', async () => {
+    const el = await fixture<HTMLButtonElement>(html`<button>Focus me</button>`);
+
+    const focusedElement = await focusElement(Promise.resolve(el));
+
+    expect(document.activeElement).dom.equal(focusedElement);
+  });
+
+  it('focuses element with optional callback', async () => {
+    const el = await fixture<HTMLButtonElement>(html`<button>Focus me</button>`);
+
+    const focusedElement = await new Promise(async (resolve) => {
+      await focusElement(Promise.resolve(el), (n => {
+        resolve(n);
+      }));
+    });
+
+    expect(document.activeElement).dom.equal(focusedElement);
+  });
+});