state: implement SignedDataSource on DumpVarsRequest message

state/sign.go

@@ -27,3 +27,10 @@ func (m HealthRequest) SignedData() ([]byte, error) {
 func (m DumpRequest) SignedData() ([]byte, error) {
 	return make([]byte, 0), nil
 }
+
+// SignedData returns payload bytes of the request.
+//
+// Always returns an empty slice.
+func (m DumpVarsRequest) SignedData() ([]byte, error) {
+	return make([]byte, 0), nil
+}

state/sign_test.go

@@ -42,6 +42,11 @@ func TestRequestSign(t *testing.T) {
 				return new(DumpRequest)
 			},
 		},
+		{ // DumpVarsRequest
+			constructor: func() sigType {
+				return new(DumpVarsRequest)
+			},
+		},
 	}
 
 	for _, item := range items {