diff --git a/weed/s3iam/s3iam_filer_store_test.go b/weed/s3iam/s3iam_filer_store_test.go
new file mode 100644
index 000000000..b87dd4f17
--- /dev/null
+++ b/weed/s3iam/s3iam_filer_store_test.go
@@ -0,0 +1,63 @@
+package s3iam
+
+import (
+	"testing"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/iam_pb"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	ACTION_READ    = "Read"
+	ACTION_WRITE   = "Write"
+	ACTION_ADMIN   = "Admin"
+	ACTION_TAGGING = "Tagging"
+	ACTION_LIST    = "List"
+)
+
+func TestS3Conf(t *testing.T) {
+	ifs := &IAMFilerStore{}
+	s3Conf := &iam_pb.S3ApiConfiguration{
+		Identities: []*iam_pb.Identity{
+			{
+				Name: "some_name",
+				Credentials: []*iam_pb.Credential{
+					{
+						AccessKey: "some_access_key1",
+						SecretKey: "some_secret_key1",
+					},
+				},
+				Actions: []string{
+					ACTION_ADMIN,
+					ACTION_READ,
+					ACTION_WRITE,
+				},
+			},
+			{
+				Name: "some_read_only_user",
+				Credentials: []*iam_pb.Credential{
+					{
+						AccessKey: "some_access_key2",
+						SecretKey: "some_secret_key2",
+					},
+				},
+				Actions: []string{
+					ACTION_READ,
+					ACTION_TAGGING,
+					ACTION_LIST,
+				},
+			},
+		},
+	}
+	s3ConfSaved := &iam_pb.S3ApiConfiguration{}
+	extended := make(map[string][]byte)
+	_ = ifs.saveIAMConfigToEntryExtended(&extended, s3Conf)
+	_ = ifs.loadIAMConfigFromEntryExtended(&extended, s3ConfSaved)
+
+	assert.Equal(t, "some_name", s3ConfSaved.Identities[0].Name)
+	assert.Equal(t, "some_read_only_user", s3ConfSaved.Identities[1].Name)
+	assert.Equal(t, "some_access_key1", s3ConfSaved.Identities[0].Credentials[0].AccessKey)
+	assert.Equal(t, "some_secret_key2", s3ConfSaved.Identities[1].Credentials[0].SecretKey)
+
+}