可以定义一个 AMQP 连接接口，然后创建一个实现该接口的模拟连接，以便进行测试。例如：

type AMQPConnection interface {
    Channel() (AMQPChannel, error)
    Close() error
}

type MockAMQPConnection struct{}

func (m *MockAMQPConnection) Channel() (AMQPChannel, error) {
    return &MockAMQPChannel{}, nil
}

func (m *MockAMQPConnection) Close() error {
    return nil
}

type AMQPChannel interface {
    ExchangeDeclare(exchange, kind string, durable, autoDelete, internal, noWait bool, args amqp.Table) error
    QueueDeclare(name string, durable, autoDelete, exclusive, noWait bool, args amqp.Table) (amqp.Queue, error)
    QueueBind(name, key, exchange string, noWait bool, args amqp.Table) error
    Qos(prefetchCount, prefetchSize int, global bool) error
    Consume(queue, consumer string, autoAck, exclusive, noLocal, noWait bool, args amqp.Table) (<-chan amqp.Delivery, error)
    Cancel(consumer string, noWait bool) error
    Close() error
}

type MockAMQPChannel struct{}

func (m *MockAMQPChannel) ExchangeDeclare(exchange, kind string, durable, autoDelete, internal, noWait bool, args amqp.Table) error {
    return nil
}

func (m *MockAMQPChannel) QueueDeclare(name string, durable, autoDelete, exclusive, noWait bool, args amqp.Table) (amqp.Queue, error) {
    return amqp.Queue{}, nil
}

func (m *MockAMQPChannel) QueueBind(name, key, exchange string, noWait bool, args amqp.Table) error {
    return nil
}

func (m *MockAMQPChannel) Qos(prefetchCount, prefetchSize int, global bool) error {
    return nil
}

func (m *MockAMQPChannel) Consume(queue, consumer string, autoAck, exclusive, noLocal, noWait bool, args amqp.Table) (<-chan amqp.Delivery, error) {
    return make(<-chan amqp.Delivery), nil
}

func (m *MockAMQPChannel) Cancel(consumer string, noWait bool) error {
    return nil
}

func (m *MockAMQPChannel) Close() error {
    return nil
}

然后，在编写代码时使用 AMQPConnection 和 AMQPChannel 接口来创建链接和通道，以便在测试时可以轻松地使用 MockAMQPConnection 和 MockAMQPChannel。

func createConnection() (AMQPConnection, error) {
    // Connect to a real AMQP broker
    conn, err := amqp.Dial("amqp://guest:guest@localhost:5672/")
    if err != nil {
        return nil, err
    }

    return conn, nil
}

func main() {
    conn, err := createConnection()
    if err != nil {
        log.Fatal(err)
    }
    defer conn.Close()

    channel, err := conn.Channel()
    if err != nil {
        log.Fatal(err)
    }
    defer channel.Close()

    // Use channel to interact with AMQP broker
}

在测试时，只需使用 MockAMQPConnection 和 MockAMQPChannel 代替实际的连接和通道。

func createMockConnection() (AMQPConnection, error) {
    // Connect to a mock