更新

im/backend/internal/app/presence_test.go

@@ -0,0 +1,24 @@
+package app
+
+import "testing"
+
+func TestHubTracksOnlineAcrossMultipleDevices(t *testing.T) {
+	hub := NewHub()
+	first := &wsClient{userID: 7}
+	second := &wsClient{userID: 7}
+	if !hub.add(first) || !hub.online(7) {
+		t.Fatal("first socket must make the user online")
+	}
+	if hub.add(second) {
+		t.Fatal("a second device must not emit a duplicate online transition")
+	}
+	if hub.remove(first) || !hub.online(7) {
+		t.Fatal("one remaining device must keep the user online")
+	}
+	if !hub.remove(second) || hub.online(7) {
+		t.Fatal("the final socket must make the user offline")
+	}
+	if hub.remove(second) {
+		t.Fatal("a late duplicate close must not emit another transition")
+	}
+}