diff --git a/go.mod b/go.mod
index e6dd6ce..79b8059 100644
--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,7 @@ require (
 	github.com/libp2p/go-reuseport v0.0.2
 	github.com/mccutchen/go-httpbin v1.1.1
 	github.com/pelletier/go-toml v1.8.1
+	github.com/stretchr/objx v0.3.0 // indirect
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
 )
diff --git a/go.sum b/go.sum
index 1563bf5..aea74ac 100644
--- a/go.sum
+++ b/go.sum
@@ -16,6 +16,9 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.3.0 h1:NGXK3lHquSN08v5vWalVI/L8XU9hdzE/G6xsrze47As=
+github.com/stretchr/objx v0.3.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
diff --git a/mtglib/network/init_test.go b/mtglib/network/init_test.go
index 89aba2b..d44ff5b 100644
--- a/mtglib/network/init_test.go
+++ b/mtglib/network/init_test.go
@@ -5,12 +5,53 @@ import (
 	"net"
 	"net/http/httptest"
 	"strings"
+	"time"
 
 	"github.com/mccutchen/go-httpbin/httpbin"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/suite"
 )
 
+type ConnMock struct {
+	mock.Mock
+}
+
+func (c *ConnMock) Read(b []byte) (int, error) {
+	args := c.Called(b)
+
+	return args.Int(0), args.Error(1)
+}
+
+func (c *ConnMock) Write(b []byte) (int, error) {
+	args := c.Called(b)
+
+	return args.Int(0), args.Error(1)
+}
+
+func (c *ConnMock) Close() error {
+	return c.Called().Error(0)
+}
+
+func (c *ConnMock) LocalAddr() net.Addr {
+	return c.Called().Get(0).(net.Addr)
+}
+
+func (c *ConnMock) RemoteAddr() net.Addr {
+	return c.Called().Get(0).(net.Addr)
+}
+
+func (c *ConnMock) SetDeadline(t time.Time) error {
+	return c.Called(t).Error(0)
+}
+
+func (c *ConnMock) SetReadDeadline(t time.Time) error {
+	return c.Called(t).Error(0)
+}
+
+func (c *ConnMock) SetWriteDeadline(t time.Time) error {
+	return c.Called(t).Error(0)
+}
+
 type DialerMock struct {
 	mock.Mock
 }