fix: add missing tests

tests/App.spec.ts

@@ -0,0 +1,20 @@
+import { App } from '../src/models/App';
+import { expect } from 'chai';
+
+describe('App', function () {
+  it('should be defined', function () {
+    expect(App).to.not.be.undefined;
+  });
+
+  it('should have a constructor', function () {
+    expect(App).to.have.property('constructor');
+  });
+
+  it('should have 3 parameters', function () {
+    expect(App).to.have.lengthOf(3);
+  });
+
+  it('should create a new instance of the App class', function () {
+    expect(() => new App('href', 1, 'name')).to.not.throw();
+  });
+});