backends: Add Save()

backend/mem/backend_test.go

@@ -58,6 +58,20 @@ func TestMemBackendWrite(t *testing.T) {
 	test.TestWrite(t)
 }
 
+func TestMemBackendSave(t *testing.T) {
+	if SkipMessage != "" {
+		t.Skip(SkipMessage)
+	}
+	test.TestSave(t)
+}
+
+func TestMemBackendSaveFilenames(t *testing.T) {
+	if SkipMessage != "" {
+		t.Skip(SkipMessage)
+	}
+	test.TestSaveFilenames(t)
+}
+
 func TestMemBackendBackend(t *testing.T) {
 	if SkipMessage != "" {
 		t.Skip(SkipMessage)

backend/mem/mem_backend.go

@@ -45,6 +45,10 @@ func New() *MemoryBackend {
 		return memLoad(be, h, p, off)
 	}
 
+	be.MockBackend.SaveFn = func(h backend.Handle, p []byte) error {
+		return memSave(be, h, p)
+	}
+
 	be.MockBackend.StatFn = func(h backend.Handle) (backend.BlobInfo, error) {
 		return memStat(be, h)
 	}