package nodes

import "testing"

// TestHub_IsOnline verifies the agent-liveness signal that ListNodes/ConnectNode
// now rely on: a node is online exactly while its agent stream is registered.
func TestHub_IsOnline(t *testing.T) {
	h := NewHub(nil) // IsOnline/Register touch only the subs map, never Redis.
	const node = "node-1"

	if h.IsOnline(node) {
		t.Fatal("IsOnline=true before any agent registered")
	}

	_, done := h.Register(node)
	if !h.IsOnline(node) {
		t.Fatal("IsOnline=false while agent stream registered")
	}
	if h.IsOnline("other") {
		t.Fatal("IsOnline=true for a never-registered node")
	}

	done() // agent stream ends
	if h.IsOnline(node) {
		t.Fatal("IsOnline=true after the stream ended")
	}
}