Replace test command.

Author: T4rk1n

{{cookiecutter.project_shortname}}/README.md

@@ -75,7 +75,7 @@ If you have selected install_dependencies during the prompt, you can skip this p
 - Include CSS files in your distribution folder (`{{cookiecutter.project_shortname}}`) and reference them in `MANIFEST.in`
 - The `tests` folder contains a sample integration test. This will run a sample Dash app in a browser. Run this with:
     ```
-    $ python -m unittest tests.test_render
+    $ pytest tests
     ```
     The Dash team uses these types of integration tests extensively. Browse the Dash component code on GitHub for more examples of testing (e.g. https://github.com/plotly/dash-core-components)
 - Publishing your component to NPM will make the JavaScript bundles available on the unpkg CDN. By default, Dash servers the component library's CSS and JS from the remote unpkg CDN, so if you haven't published the component package to NPM you'll need to set the `serve_locally` flags to `True` (unless you choose `False` on `publish_on_npm`). We will eventually make `serve_locally=True` the default, [follow our progress in this issue](https://github.com/plotly/dash/issues/284).

{{cookiecutter.project_shortname}}/_validate_init.py

@@ -33,7 +33,7 @@ def check_dist(dist, filename):
         for d in dist
         for x in (
             [d.get('relative_package_path')]
-            if isinstance(d.get('relative_package_path'), str)
+            if not isinstance(d.get('relative_package_path'), list)
             else d.get('relative_package_path')
         )
     )