diff --git a/fileTransfer/connect/utils_test.go b/fileTransfer/connect/utils_test.go
index 83d75d020beccafe57c72331b0595a05253c0470..6c9de504f42e812ec9bfc7c2c9925667241daa71 100644
--- a/fileTransfer/connect/utils_test.go
+++ b/fileTransfer/connect/utils_test.go
@@ -119,11 +119,6 @@ func (m *mockCmix) Send(*id.ID, format.Fingerprint, message.Service, []byte,
 	panic("implement me")
 }
 
-func (m *mockCmix) SendWithAssembler(recipient *id.ID, assembler cmix.MessageAssembler,
-	cmixParams cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
-	panic("implement me")
-}
-
 func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	_ cmix.CMIXParams) (rounds.Round, []ephemeral.Id, error) {
 	m.handler.Lock()
@@ -140,6 +135,11 @@ func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	return rounds.Round{ID: 42}, []ephemeral.Id{}, nil
 }
 
+func (m *mockCmix) SendWithAssembler(*id.ID, cmix.MessageAssembler,
+	cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
+	panic("implement me")
+}
+
 func (m *mockCmix) AddIdentity(*id.ID, time.Time, bool)            { panic("implement me") }
 func (m *mockCmix) RemoveIdentity(*id.ID)                          { panic("implement me") }
 func (m *mockCmix) GetIdentity(*id.ID) (identity.TrackedID, error) { panic("implement me") }
@@ -196,10 +196,12 @@ func (m *mockCmix) GetRoundResults(_ time.Duration,
 func (m *mockCmix) LookupHistoricalRound(id.Round, rounds.RoundResultCallback) error {
 	panic("implement me")
 }
-func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error), *stoppable.Single) (interface{}, error) {
+func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error),
+	*stoppable.Single) (interface{}, error) {
 	panic("implement me")
 }
-func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc, *stoppable.Single, time.Duration) (interface{}, error) {
+func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc,
+	*stoppable.Single, time.Duration) (interface{}, error) {
 	panic("implement me")
 }
 func (m *mockCmix) SetGatewayFilter(gateway.Filter)   { panic("implement me") }
diff --git a/fileTransfer/e2e/utils_test.go b/fileTransfer/e2e/utils_test.go
index a9e17b912810dbf24bf640d518bf2c434e95181b..7de4bba2c25ddb23103da9f04c4a6eac8898984c 100644
--- a/fileTransfer/e2e/utils_test.go
+++ b/fileTransfer/e2e/utils_test.go
@@ -121,11 +121,6 @@ func (m *mockCmix) Send(*id.ID, format.Fingerprint, message.Service, []byte,
 	panic("implement me")
 }
 
-func (m *mockCmix) SendWithAssembler(recipient *id.ID, assembler cmix.MessageAssembler,
-	cmixParams cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
-	panic("implement me")
-}
-
 func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	_ cmix.CMIXParams) (rounds.Round, []ephemeral.Id, error) {
 	m.handler.Lock()
@@ -142,6 +137,11 @@ func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	return rounds.Round{ID: 42}, []ephemeral.Id{}, nil
 }
 
+func (m *mockCmix) SendWithAssembler(*id.ID, cmix.MessageAssembler,
+	cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
+	panic("implement me")
+}
+
 func (m *mockCmix) AddIdentity(*id.ID, time.Time, bool)            { panic("implement me") }
 func (m *mockCmix) RemoveIdentity(*id.ID)                          { panic("implement me") }
 func (m *mockCmix) GetIdentity(*id.ID) (identity.TrackedID, error) { panic("implement me") }
@@ -198,10 +198,12 @@ func (m *mockCmix) GetRoundResults(_ time.Duration,
 func (m *mockCmix) LookupHistoricalRound(id.Round, rounds.RoundResultCallback) error {
 	panic("implement me")
 }
-func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error), *stoppable.Single) (interface{}, error) {
+func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error),
+	*stoppable.Single) (interface{}, error) {
 	panic("implement me")
 }
-func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc, *stoppable.Single, time.Duration) (interface{}, error) {
+func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc,
+	*stoppable.Single, time.Duration) (interface{}, error) {
 	panic("implement me")
 }
 func (m *mockCmix) SetGatewayFilter(gateway.Filter)   { panic("implement me") }
diff --git a/fileTransfer/groupChat/utils_test.go b/fileTransfer/groupChat/utils_test.go
index 76b2ba1285a05381f719089e03bca00248182218..61dd18006d7d80b35712cc938267a2f5bd2ae4f7 100644
--- a/fileTransfer/groupChat/utils_test.go
+++ b/fileTransfer/groupChat/utils_test.go
@@ -116,11 +116,6 @@ func (m *mockCmix) Send(*id.ID, format.Fingerprint, message.Service, []byte,
 	panic("implement me")
 }
 
-func (m *mockCmix) SendWithAssembler(recipient *id.ID, assembler cmix.MessageAssembler,
-	cmixParams cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
-	panic("implement me")
-}
-
 func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	_ cmix.CMIXParams) (rounds.Round, []ephemeral.Id, error) {
 	m.handler.Lock()
@@ -137,6 +132,11 @@ func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	return rounds.Round{ID: 42}, []ephemeral.Id{}, nil
 }
 
+func (m *mockCmix) SendWithAssembler(*id.ID, cmix.MessageAssembler,
+	cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
+	panic("implement me")
+}
+
 func (m *mockCmix) AddIdentity(*id.ID, time.Time, bool)            { panic("implement me") }
 func (m *mockCmix) RemoveIdentity(*id.ID)                          { panic("implement me") }
 func (m *mockCmix) GetIdentity(*id.ID) (identity.TrackedID, error) { panic("implement me") }
@@ -193,10 +193,12 @@ func (m *mockCmix) GetRoundResults(_ time.Duration,
 func (m *mockCmix) LookupHistoricalRound(id.Round, rounds.RoundResultCallback) error {
 	panic("implement me")
 }
-func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error), *stoppable.Single) (interface{}, error) {
+func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error),
+	*stoppable.Single) (interface{}, error) {
 	panic("implement me")
 }
-func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc, *stoppable.Single, time.Duration) (interface{}, error) {
+func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc,
+	*stoppable.Single, time.Duration) (interface{}, error) {
 	panic("implement me")
 }
 func (m *mockCmix) SetGatewayFilter(gateway.Filter)   { panic("implement me") }
diff --git a/fileTransfer/send.go b/fileTransfer/send.go
index fb4bbddb36c66d5a7f5ebd0bfff9d7b160bbdc91..ea9bac2027cc65f2db3ede5ee8ef684cb1eb7f05 100644
--- a/fileTransfer/send.go
+++ b/fileTransfer/send.go
@@ -141,7 +141,8 @@ func (m *manager) sendCmix(packet []store.Part) {
 
 // roundResultsCallback generates a network.RoundEventCallback that handles
 // all parts in the packet once the round succeeds or fails.
-func (m *manager) roundResultsCallback(packet []store.Part) cmix.RoundEventCallback {
+func (m *manager) roundResultsCallback(
+	packet []store.Part) cmix.RoundEventCallback {
 	// Group file parts by transfer
 	grouped := map[ftCrypto.TransferID][]store.Part{}
 	for _, p := range packet {
diff --git a/fileTransfer/utils_test.go b/fileTransfer/utils_test.go
index 96c400a9dfdaa63cb84242b083e41325c25606d1..ff7750fcbce0c8d99f260ffdd2c48bb6d64d14a7 100644
--- a/fileTransfer/utils_test.go
+++ b/fileTransfer/utils_test.go
@@ -170,11 +170,6 @@ func (m *mockCmix) Send(*id.ID, format.Fingerprint, message.Service, []byte,
 	panic("implement me")
 }
 
-func (m *mockCmix) SendWithAssembler(recipient *id.ID, assembler cmix.MessageAssembler,
-	cmixParams cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
-	panic("implement me")
-}
-
 func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	_ cmix.CMIXParams) (rounds.Round, []ephemeral.Id, error) {
 	m.handler.Lock()
@@ -193,6 +188,11 @@ func (m *mockCmix) SendMany(messages []cmix.TargetedCmixMessage,
 	return rounds.Round{ID: round}, []ephemeral.Id{}, nil
 }
 
+func (m *mockCmix) SendWithAssembler(*id.ID, cmix.MessageAssembler,
+	cmix.CMIXParams) (rounds.Round, ephemeral.Id, error) {
+	panic("implement me")
+}
+
 func (m *mockCmix) AddIdentity(*id.ID, time.Time, bool)            { panic("implement me") }
 func (m *mockCmix) RemoveIdentity(*id.ID)                          { panic("implement me") }
 func (m *mockCmix) GetIdentity(*id.ID) (identity.TrackedID, error) { panic("implement me") }
@@ -249,10 +249,12 @@ func (m *mockCmix) GetRoundResults(_ time.Duration,
 func (m *mockCmix) LookupHistoricalRound(id.Round, rounds.RoundResultCallback) error {
 	panic("implement me")
 }
-func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error), *stoppable.Single) (interface{}, error) {
+func (m *mockCmix) SendToAny(func(host *connect.Host) (interface{}, error),
+	*stoppable.Single) (interface{}, error) {
 	panic("implement me")
 }
-func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc, *stoppable.Single, time.Duration) (interface{}, error) {
+func (m *mockCmix) SendToPreferred([]*id.ID, gateway.SendToPreferredFunc,
+	*stoppable.Single, time.Duration) (interface{}, error) {
 	panic("implement me")
 }
 func (m *mockCmix) SetGatewayFilter(gateway.Filter)   { panic("implement me") }