Now that we have this in place we can actually test things out. What we're going to do is join a room, then we're going to have a second user join, and we should see the message right there: Their name has joined. We're also going to add a third user into the mix to make sure it's actually sending the message to just one room.
Over inside the browser, let's get started by creating a user called User One. This user is going to join a room called uppercase A:
Now we're going to go ahead and create a second user by going to localhost:3000. This one can be called User Two and we're going to join room B:
And if ...
