diff --git a/credential/default_access_token_test.go b/credential/default_access_token_test.go
new file mode 100644
index 0000000..feafe39
--- /dev/null
+++ b/credential/default_access_token_test.go
@@ -0,0 +1,18 @@
+package credential
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"gopkg.in/h2non/gock.v1"
+)
+
+func TestGetTicketFromServer(t *testing.T) {
+	defer gock.Off()
+	gock.New(getTicketURL).Reply(200).JSON(&ResTicket{Ticket: "mock-ticket", ExpiresIn: 10})
+	ticket, err := GetTicketFromServer("arg-ak")
+	assert.Nil(t, err)
+	assert.Equal(t, int64(0), ticket.ErrCode)
+	assert.Equal(t, "mock-ticket", ticket.Ticket, "they should be equal")
+	assert.Equal(t, int64(10), ticket.ExpiresIn, "they should be equal")
+}
diff --git a/go.mod b/go.mod
index 05eb1d5..accf6a3 100644
--- a/go.mod
+++ b/go.mod
@@ -8,5 +8,7 @@ require (
 	github.com/gomodule/redigo v1.8.1
 	github.com/sirupsen/logrus v1.6.0
 	github.com/spf13/cast v1.3.1
+	github.com/stretchr/testify v1.5.1
 	golang.org/x/crypto v0.0.0-20200510223506-06a226fb4e37
+	gopkg.in/h2non/gock.v1 v1.0.15
 )
diff --git a/go.sum b/go.sum
index 2098f8c..16de9c6 100644
--- a/go.sum
+++ b/go.sum
@@ -7,8 +7,11 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/fatih/structs v1.1.0/go.mod h1:9NiDSp5zOcgEDl+j00MP/WkGVPOlPRLejGD8Ga6PJ7M=
 github.com/gomodule/redigo v1.8.1 h1:Abmo0bI7Xf0IhdIPc7HZQzZcShdnmxeoVuDDtIQp8N8=
 github.com/gomodule/redigo v1.8.1/go.mod h1:P9dn9mFrCBvWhGE1wpxx6fgq7BAeLBk+UUUzlpkBYO0=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542 h1:2VTzZjLZBgl62/EtslCrtky5vbi9dd7HrQPQIx6wqiw=
+github.com/h2non/parth v0.0.0-20190131123155-b4df798d6542/go.mod h1:Ow0tF8D4Kplbc8s8sSb3V2oUCygFHVp8gC3Dn6U4MNI=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
 github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/nbio/st v0.0.0-20140626010706-e9e8d9816f32/go.mod h1:9wM+0iRr9ahx58uYLpLIr5fm8diHn0JbqRycJi6w0Ms=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
 github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
@@ -29,5 +32,7 @@ golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/h2non/gock.v1 v1.0.15 h1:SzLqcIlb/fDfg7UvukMpNcWsu7sI5tWwL+KCATZqks0=
+gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=