diff --git a/lib/libesp32/berry/tests/virtual_methods.be b/lib/libesp32/berry/tests/virtual_methods.be
index 514fb3cc2..e744dcca8 100644
--- a/lib/libesp32/berry/tests/virtual_methods.be
+++ b/lib/libesp32/berry/tests/virtual_methods.be
@@ -32,9 +32,11 @@ assert_attribute_error(/-> t.c)
 
 class T2 : T1
     def member(n)
+        import undefined
         if (n == 'f1') return / n -> n end
         if (n == 'f2') return /-> 4 end
         if (n == 'a1') return 10 end
+        if (n == 'h')  return undefined end
     end
 end
 t2 = T2()
@@ -50,6 +52,7 @@ assert_attribute_error(/-> t2.h())
 assert(t2.f1() == t2)
 assert(t2.f2() == 4)
 assert(t2.a1 == 10)
+assert(t2.foo == nil)
 
 #- module -#
 m = module("m")
@@ -59,8 +62,11 @@ assert(m.a == 1)
 assert_attribute_error(/-> m.b)
 
 m.member = def(n)
+    import undefined
     if n == "b" return 2 end
+    if n == "c" return undefined end
 end
 
 assert(m.b == 2)
 assert_attribute_error(/-> m.c)
+assert(m.d == nil)  #- returns nil if no response -#