Add test for DispatchEvent with error handling

This commit introduces a new test, Test_DispatchEventWithError, to verify error handling when dispatching events. It ensures that the dispatcher properly returns an error when an event handler triggers one.

dispatcher_test.go

@@ -136,6 +136,17 @@ func Test_UnknownEvent(t *testing.T) {
 	}
 }
 
+func Test_DispatchEventWithError(t *testing.T) {
+	d := NewDispatcher()
+	d.RegisterCommandHandler(testCommand{}, &testCommandHandler{})
+	d.RegisterEventHandler(testEvent{}, &testErrorEventHandler{})
+
+	err := d.DispatchEvent(context.Background(), testEvent{})
+	if err == nil {
+		t.Fatal("expected error")
+	}
+}
+
 func Test_Error(t *testing.T) {
 	d := NewDispatcher()
 	d.RegisterCommandHandler(testCommand{}, &testErrorHandler{})