Add Stream messaging struct

stream/messaging_test.go

@@ -0,0 +1,30 @@
+package stream
+
+import (
+	"testing"
+)
+
+func TestWithoutOutputs(t *testing.T) {
+	stream := New()
+	defer stream.Close()
+	stream.Broadcast <- "hello world"
+}
+
+func TestWithOneOutput(t *testing.T) {
+	stream := New()
+	defer stream.Close()
+
+	// Register one output
+	output := make(chan interface{}, 64)
+	stream.Register(output)
+
+	// Try to pass one message
+	stream.Broadcast <- "hello world"
+	msg := <-output
+	if m, ok := msg.(string); !ok || m != "hello world" {
+		t.Error("Message has wrong type or content")
+	}
+
+	// Unregister
+	stream.Unregister(output)
+}