diff --git a/internal/crl/crl.go b/internal/revocation/crl/crl.go
similarity index 100%
rename from internal/crl/crl.go
rename to internal/revocation/crl/crl.go
diff --git a/internal/crl/crl_test.go b/internal/revocation/crl/crl_test.go
similarity index 100%
rename from internal/crl/crl_test.go
rename to internal/revocation/crl/crl_test.go
diff --git a/internal/revocation/revocation.go b/internal/revocation/revocation.go
index b5688d201..412d6f0e5 100644
--- a/internal/revocation/revocation.go
+++ b/internal/revocation/revocation.go
@@ -25,8 +25,8 @@ import (
 	"github.com/notaryproject/notation-core-go/revocation/purpose"
 	"github.com/notaryproject/notation-go/dir"
 	"github.com/notaryproject/notation-go/verifier/crl"
-	clicrl "github.com/notaryproject/notation/internal/crl"
 	"github.com/notaryproject/notation/internal/httputil"
+	clicrl "github.com/notaryproject/notation/internal/revocation/crl"
 )
 
 // NewRevocationValidator returns a revocation.Validator given the certificate
diff --git a/internal/revocation/revocation_test.go b/internal/revocation/revocation_test.go
index 7c1aedd9e..eeb7ff54b 100644
--- a/internal/revocation/revocation_test.go
+++ b/internal/revocation/revocation_test.go
@@ -15,12 +15,16 @@ package revocation
 
 import (
 	"context"
+	"net/http"
 	"os"
 	"runtime"
 	"testing"
+	"time"
 
+	corecrl "github.com/notaryproject/notation-core-go/revocation/crl"
 	"github.com/notaryproject/notation-core-go/revocation/purpose"
 	"github.com/notaryproject/notation-go/dir"
+	"github.com/notaryproject/notation/internal/httputil"
 )
 
 func TestNewRevocationValidator(t *testing.T) {
@@ -57,3 +61,15 @@ func TestNewRevocationValidator(t *testing.T) {
 		}
 	})
 }
+
+func TestNilError(t *testing.T) {
+	_, err := corecrl.NewHTTPFetcher(httputil.NewClient(context.Background(), &http.Client{Timeout: 5 * time.Second}))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = dir.CacheFS().SysPath(dir.PathCRLCache)
+	if err != nil {
+		t.Fatal(err)
+	}
+}