test(page): add tests

test/components/page.test.ts

@@ -0,0 +1,16 @@
+import { expect, fixture, html } from '@open-wc/testing';
+import { Page } from '../../dist/components/page';
+
+describe('Page', () => {
+  it('should be defined', async () => {
+    const el = await fixture<Page>(html`<mm-page></mm-page>`);
+    expect(el).to.be.instanceOf(Page);
+  });
+
+  it('should have shadow root and elements inside it', async () => {
+    const el = await fixture<Page>(html`<mm-page></mm-page>`);
+    const shadowRoot = el.shadowRoot;
+    expect(shadowRoot).to.be.instanceof(ShadowRoot);
+    expect(shadowRoot?.querySelector('slot')).to.be.instanceOf(HTMLElement);
+  });
+});