From 44cbb080a75434da98836946ba9d508df598c1ec Mon Sep 17 00:00:00 2001
From: Robert Zaremba <robert@zaremba.ch>
Date: Sat, 5 Dec 2020 00:08:32 +0100
Subject: [PATCH] adding test

---
 codec/codec_common_test.go | 3 +++
 codec/proto_codec_test.go  | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/codec/codec_common_test.go b/codec/codec_common_test.go
index 10820ecc5097..12e9bd2224e1 100644
--- a/codec/codec_common_test.go
+++ b/codec/codec_common_test.go
@@ -17,6 +17,9 @@ type interfaceMarshaler struct {
 }
 
 func testInterfaceMarshaling(require *require.Assertions, cdc interfaceMarshaler, isAminoBin bool) {
+	_, err := cdc.marshal(nil)
+	require.Error(err, "can't marshal a nil value")
+
 	dog := &testdata.Dog{Name: "rufus"}
 	var dogI testdata.Animal = dog
 	bz, err := cdc.marshal(dogI)
diff --git a/codec/proto_codec_test.go b/codec/proto_codec_test.go
index 72346e929d4d..706d025d5994 100644
--- a/codec/proto_codec_test.go
+++ b/codec/proto_codec_test.go
@@ -28,6 +28,8 @@ func TestProtoMarsharlInterface(t *testing.T) {
 	cdc := codec.NewProtoCodec(createTestInterfaceRegistry())
 	m := interfaceMarshaler{cdc.MarshalInterface, cdc.UnmarshalInterface}
 	testInterfaceMarshaling(require.New(t), m, false)
+	m = interfaceMarshaler{cdc.MarshalInterfaceJSON, cdc.UnmarshalInterfaceJSON}
+	testInterfaceMarshaling(require.New(t), m, false)
 }
 
 func TestProtoCodec(t *testing.T) {