diff --git a/backend/generic_test.go b/backend/generic_test.go
index d6aee96cf..c45a4c8b6 100644
--- a/backend/generic_test.go
+++ b/backend/generic_test.go
@@ -2,7 +2,6 @@ package backend_test
 
 import (
 	"fmt"
-	"io"
 	"path/filepath"
 	"reflect"
 	"runtime"
@@ -48,48 +47,13 @@ func str2id(s string) backend.ID {
 }
 
 type mockBackend struct {
-	list       func(backend.Type, <-chan struct{}) <-chan string
-	get        func(backend.Type, backend.ID) ([]byte, error)
-	getReader  func(backend.Type, backend.ID) (io.ReadCloser, error)
-	create     func(backend.Type, []byte) (backend.ID, error)
-	createFrom func(backend.Type, io.Reader) (backend.ID, error)
-	test       func(backend.Type, backend.ID) (bool, error)
-	remove     func(backend.Type, backend.ID) error
-	close      func() error
+	list func(backend.Type, <-chan struct{}) <-chan string
 }
 
 func (m mockBackend) List(t backend.Type, done <-chan struct{}) <-chan string {
 	return m.list(t, done)
 }
 
-func (m mockBackend) Get(t backend.Type, id backend.ID) ([]byte, error) {
-	return m.get(t, id)
-}
-
-func (m mockBackend) GetReader(t backend.Type, id backend.ID) (io.ReadCloser, error) {
-	return m.getReader(t, id)
-}
-
-func (m mockBackend) Create(t backend.Type, data []byte) (backend.ID, error) {
-	return m.create(t, data)
-}
-
-func (m mockBackend) CreateFrom(t backend.Type, r io.Reader) (backend.ID, error) {
-	return m.createFrom(t, r)
-}
-
-func (m mockBackend) Test(t backend.Type, id backend.ID) (bool, error) {
-	return m.test(t, id)
-}
-
-func (m mockBackend) Remove(t backend.Type, id backend.ID) error {
-	return m.remove(t, id)
-}
-
-func (m mockBackend) Close() error {
-	return m.close()
-}
-
 var samples = backend.IDs{
 	str2id("20bdc1402a6fc9b633aaffffffffffffffffffffffffffffffffffffffffffff"),
 	str2id("20bdc1402a6fc9b633ccd578c4a92d0f4ef1a457fa2e16c596bc73fb409d6cc0"),