What is a Go channel and how is it declared? What happens if a panic is not recovered? How do you send and receive values through a channel? How do you handle errors returned from functions? How do you publish a single message to a topic? How can you run multiple goroutines concurrently? How do you consume a single message from a topic? How do you send and receive values through a channel? How do you write a simple test function? Code test (very simple)