add test command to verify update functionality

src/cli.py

@@ -33,6 +33,12 @@ def uuid4():
     click.echo(uuid.uuid4())
 
 
+@main.command()
+def ping():
+    """Pong!"""
+    click.echo("Pong!")
+
+
 @main.command()
 @click.argument("words", nargs=-1)
 def beautify(words: list[str]):