Include tests

[Industrial]

Hi.

The component template does not include tests. Please add one to verify that running tests works (it doesn't).

Running tests I get errors here:

node_modules/streamlit-component-lib/dist/index.js:17
    export { StreamlitComponentBase, withStreamlitConnection } from "./StreamlitReact";
    ^^^^^^

    SyntaxError: Unexpected token 'export'

Using ts-node.