diff --git a/pkg/auth/service_test.go b/pkg/auth/service_test.go
index 8f77586..1f12293 100644
--- a/pkg/auth/service_test.go
+++ b/pkg/auth/service_test.go
@@ -40,7 +40,7 @@ func TestNewY2BService(t *testing.T) {
 			want: &svc{
 				Credential: credential,
 				CacheToken: cacheToken,
-				Cacheable:  false,
+				credFile:   "client_secret.json",
 				ctx:        context.Background(),
 			},
 		},
@@ -48,18 +48,14 @@ func TestNewY2BService(t *testing.T) {
 			name: "with all options - base64",
 			args: args{
 				opts: []Option{
-					WithCredential(
-						"eyJjbGllbnRfaWQiOiJ0ZXN0In0=", mockFS,
-					),
-					WithCacheToken(
-						"eyJhY2Nlc3NfdG9rZW4iOiJ0ZXN0In0=", mockFS,
-					),
+					WithCredential("eyJjbGllbnRfaWQiOiJ0ZXN0In0=", mockFS),
+					WithCacheToken("eyJhY2Nlc3NfdG9rZW4iOiJ0ZXN0In0=", mockFS),
 				},
 			},
 			want: &svc{
 				Credential: credential,
 				CacheToken: cacheToken,
-				Cacheable:  false,
+				credFile:   "client_secret.json",
 				ctx:        context.Background(),
 			},
 		},
@@ -74,7 +70,8 @@ func TestNewY2BService(t *testing.T) {
 			want: &svc{
 				Credential: credential,
 				CacheToken: cacheToken,
-				Cacheable:  true,
+				credFile:   "/client_secrets.json",
+				tokenFile:  "/youtube.token.json",
 				ctx:        context.Background(),
 			},
 		},
@@ -84,7 +81,8 @@ func TestNewY2BService(t *testing.T) {
 				opts: []Option{},
 			},
 			want: &svc{
-				ctx: context.Background(),
+				credFile: "client_secret.json",
+				ctx:      context.Background(),
 			},
 		},
 	}
diff --git a/pkg/channelBanner/channelBanner.go b/pkg/channelBanner/channelBanner.go
index f9a6168..217eccc 100644
--- a/pkg/channelBanner/channelBanner.go
+++ b/pkg/channelBanner/channelBanner.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/eat-pray-ai/yutu/pkg"
 	"github.com/eat-pray-ai/yutu/pkg/auth"
diff --git a/pkg/playlistImage/playlistImage.go b/pkg/playlistImage/playlistImage.go
index 2f43806..bd2d505 100644
--- a/pkg/playlistImage/playlistImage.go
+++ b/pkg/playlistImage/playlistImage.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/eat-pray-ai/yutu/pkg"
 	"github.com/eat-pray-ai/yutu/pkg/auth"
diff --git a/pkg/thumbnail/thumbnail.go b/pkg/thumbnail/thumbnail.go
index 87bddd3..ea3ae11 100644
--- a/pkg/thumbnail/thumbnail.go
+++ b/pkg/thumbnail/thumbnail.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/eat-pray-ai/yutu/pkg"
 	"github.com/eat-pray-ai/yutu/pkg/auth"
diff --git a/pkg/video/video.go b/pkg/video/video.go
index 749fa98..034d617 100644
--- a/pkg/video/video.go
+++ b/pkg/video/video.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 	"slices"
 
 	"github.com/eat-pray-ai/yutu/pkg"
diff --git a/pkg/watermark/watermark.go b/pkg/watermark/watermark.go
index 42b1e19..ff109e4 100644
--- a/pkg/watermark/watermark.go
+++ b/pkg/watermark/watermark.go
@@ -4,7 +4,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os"
 
 	"github.com/eat-pray-ai/yutu/pkg"
 	"github.com/eat-pray-ai/yutu/pkg/auth"