test(core): init stencil core test suite

packages/core/src/components/button/test/button.spec.ts

@@ -0,0 +1,27 @@
+import { render, flush } from '@stencil/core/testing';
+import { Button } from '../button';
+
+
+describe('button', () => {
+
+  it('should render button inner text', async () => {
+    const root = await render({
+      components: [Button],
+      html: '<ion-button>Button Inner Text</ion-button>'
+    });
+
+    expect(root.textContent).toBe('Button Inner Text');
+    expect(root.querySelector('button').hasAttribute('disabled')).toBe(false);
+
+    root.disabled = true;
+    await flush(root);
+
+    expect(root.querySelector('button').hasAttribute('disabled')).toBe(true);
+  });
+
+  it('should default itemButton to false', () => {
+    const btn = new Button();
+    expect(btn.itemButton).toBe(false);
+  });
+
+});