feat: add cli contract and local browser events

internal/application/event_bus_test.go

@@ -0,0 +1,33 @@
+package application
+
+import (
+	"testing"
+	"time"
+
+	"chub/internal/domain"
+)
+
+func TestEventBusPublishesAndCancels(t *testing.T) {
+	bus := NewEventBus()
+	ch, cancel := bus.Subscribe(1)
+	event := domain.BrowserEvent{Kind: domain.EventBrowserStarted, InstanceID: "demo"}
+	bus.Publish(event)
+	select {
+	case got := <-ch:
+		if got.InstanceID != event.InstanceID || got.Kind != event.Kind {
+			t.Fatalf("unexpected event: %#v", got)
+		}
+	case <-time.After(time.Second):
+		t.Fatal("event was not published")
+	}
+	cancel()
+	bus.Publish(event)
+	select {
+	case _, ok := <-ch:
+		if ok {
+			t.Fatal("cancelled subscriber received an event")
+		}
+	case <-time.After(time.Second):
+		t.Fatal("subscriber was not closed")
+	}
+}