First end-to-end role tests

stack/helpers.go

@@ -174,9 +174,11 @@ func (p PanicHandler) DeliverTx(ctx basecoin.Context, store state.KVStore, tx ba
 
 // CheckHandler accepts CheckTx and verifies the permissions
 type CheckHandler struct {
-	PassOption
+	basecoin.NopOption
 }
 
+var _ basecoin.Handler = CheckHandler{}
+
 // Name - return handler's name
 func (CheckHandler) Name() string {
 	return NameCheck

stack/helpers_test.go

@@ -77,6 +77,7 @@ func TestCheck(t *testing.T) {
 		valid             bool
 		signers, required []basecoin.Actor
 	}{
+		{true, nil, nil},
 		{true, []basecoin.Actor{a}, []basecoin.Actor{a}},
 		{true, []basecoin.Actor{a, b}, []basecoin.Actor{a}},
 		{false, []basecoin.Actor{a}, []basecoin.Actor{a, b}},