From 8d5c66da501a0162f2f66749ae2d77afa1ef88fe Mon Sep 17 00:00:00 2001
From: Sean King <sean@seking.dev>
Date: Tue, 8 Feb 2022 18:14:49 +0100
Subject: [PATCH] testing: Adding MockEmptyAcknowledgement to testing library

---
 modules/core/04-channel/keeper/packet_test.go |  2 +-
 testing/mock/ack.go                           | 23 +++++++++++++++++++
 2 files changed, 24 insertions(+), 1 deletion(-)
 create mode 100644 testing/mock/ack.go

diff --git a/modules/core/04-channel/keeper/packet_test.go b/modules/core/04-channel/keeper/packet_test.go
index 7f17144be0a..3746bd2352b 100644
--- a/modules/core/04-channel/keeper/packet_test.go
+++ b/modules/core/04-channel/keeper/packet_test.go
@@ -551,7 +551,7 @@ func (suite *KeeperTestSuite) TestWriteAcknowledgement() {
 			func() {
 				suite.coordinator.Setup(path)
 				packet = types.NewPacket(ibctesting.MockPacketData, 1, path.EndpointA.ChannelConfig.PortID, path.EndpointA.ChannelID, path.EndpointB.ChannelConfig.PortID, path.EndpointB.ChannelID, timeoutHeight, disabledTimeoutTimestamp)
-				ack = types.NewResultAcknowledgement(nil)
+				ack = ibcmock.NewMockEmptyAcknowledgement()
 				channelCap = suite.chainB.GetChannelCapability(path.EndpointB.ChannelConfig.PortID, path.EndpointB.ChannelID)
 			},
 			false,
diff --git a/testing/mock/ack.go b/testing/mock/ack.go
new file mode 100644
index 00000000000..c25176a02da
--- /dev/null
+++ b/testing/mock/ack.go
@@ -0,0 +1,23 @@
+package mock
+
+// MockEmptyAcknowledgement implements the exported.Acknowledgement interface and always returns an empty byte string as Response
+type MockEmptyAcknowledgement struct {
+	Response []byte
+}
+
+// NewMockEmptyAcknowledgement returns a new instance of MockEmptyAcknowledgement
+func NewMockEmptyAcknowledgement() MockEmptyAcknowledgement {
+	return MockEmptyAcknowledgement{
+		Response: []byte{},
+	}
+}
+
+// Success implements the Acknowledgement interface
+func (ack MockEmptyAcknowledgement) Success() bool {
+	return true
+}
+
+// Acknowledgement implements the Acknowledgement interface
+func (ack MockEmptyAcknowledgement) Acknowledgement() []byte {
+	return []byte{}
+}