fix(test): add first account test

test/test.ts

@@ -1,8 +1,11 @@
 import { expect, tap } from '@pushrocks/tapbundle';
 import * as letterxpress from '../ts/index';
 
-tap.test('first test', async () => {
-  console.log('first test');
+let testAccount: letterxpress.LetterXpressAccount;
+
+tap.test('should create a valid account', async () => {
+  testAccount = new letterxpress.LetterXpressAccount();
+  expect(testAccount).to.be.instanceOf(letterxpress.LetterXpressAccount);
 });
 
 tap.start();