Ensure pathing and exports for test files

Author: Westbrook

src/generators/app-lit-element-ts/templates/my-app.test.ts

@@ -1,7 +1,7 @@
 import { html } from 'lit';
 import { fixture, expect } from '@open-wc/testing';
 
-import { <%= className %> } from '../src/<%= className %>.js';
+import type { <%= className %> } from '../src/<%= tagName %>.js';
 import '../src/<%= tagName %>.js';
 
 describe('<%= className %>', () => {

src/generators/app-lit-element-ts/templates/my-app.ts

@@ -4,7 +4,7 @@ import { property, customElement } from 'lit/decorators.js';
 const logo = new URL('../../assets/open-wc-logo.svg', import.meta.url).href;
 
 @customElement('<%= tagName %>')
-class <%= className %> extends LitElement {
+export class <%= className %> extends LitElement {
   @property({ type: String }) header = 'My app';
 
   static styles = css`