added tests

libs/bytes/bytes.go

@@ -70,6 +70,8 @@ func (bz HexBytes) Format(s fmt.State, verb rune) {
 	}
 }
 
+// Matches the hexbytes MarshalJSON of tendermint/tendermint. Overrides the
+// default []byte Marshal implementation. This is basically the point of hex bytes.
 func (bz HexBytes) MarshalJSON() ([]byte, error) {
 	s := strings.ToUpper(hex.EncodeToString(bz))
 	jbz := make([]byte, len(s)+2)
@@ -79,6 +81,8 @@ func (bz HexBytes) MarshalJSON() ([]byte, error) {
 	return jbz, nil
 }
 
+// Matches the hexbytes UnmarshalJSON of tendermint/tendermint. Overrides the
+// default []byte Marshal implementation. This is basically the point of hex bytes.
 func (bz *HexBytes) UnmarshalJSON(data []byte) error {
 	if len(data) < 2 || data[0] != '"' || data[len(data)-1] != '"' {
 		return fmt.Errorf("invalid hex string: %s", data)

libs/bytes/bytes_test.go

@@ -72,3 +72,41 @@ func TestHexBytes_String(t *testing.T) {
 		t.Fatal(err)
 	}
 }
+
+// Define a struct to match the JSON structure
+type ValidatorsHash struct {
+	NextValidatorsHash HexBytes `json:"next_validators_hash"`
+}
+
+func TestMarshalBasic(t *testing.T) {
+	var vh ValidatorsHash
+	vh.NextValidatorsHash = []byte("abc")
+	bz, err := json.Marshal(vh)
+	if err != nil {
+		t.Fatal(err)
+	}
+	assert.Equal(t, string(bz), "{\"next_validators_hash\":\"616263\"}")
+}
+
+func TestUnmarshalBasic(t *testing.T) {
+	jsonData := []byte(`{"next_validators_hash":"616263"}`)
+	var vh ValidatorsHash
+	err := json.Unmarshal(jsonData, &vh)
+	if err != nil {
+		t.Fatalf("Error unmarshalling JSON: %v", err)
+		return
+	}
+	assert.Equal(t, string(vh.NextValidatorsHash), "abc")
+}
+
+func TestUnmarshalExample(t *testing.T) {
+	jsonData := []byte(`{"next_validators_hash":"20021C2FB4B2DDFF6E8C484A2ED5862910E3AD7074FC6AD1C972AD34891AE3A4"}`)
+	expectedLength := 32
+	var vh ValidatorsHash
+	err := json.Unmarshal(jsonData, &vh)
+	if err != nil {
+		t.Fatalf("Error unmarshalling JSON: %v", err)
+		return
+	}
+	assert.Equal(t, expectedLength, len(vh.NextValidatorsHash))
+}