incorporate observer interface into components

observer/observer_test.go

@@ -0,0 +1,17 @@
+package observer
+
+import (
+	"testing"
+)
+
+func TestNullObserver(t *testing.T) {
+	// Test that NullObserver implements the Observer interface
+	var _ Observer = NullObserver{}
+
+	// Test that calling Record doesn't panic or crash
+	sink := NullObserver{}
+	sink.Record("peer1", "test event")
+	sink.Record("", nil)
+
+	// Test that it's a no-op (no assertions needed since it does nothing)
+}