fix small Read() big rate for slow.Reader

src/asses/one_test.go

@@ -17,20 +17,24 @@ func TestOne(t *testing.T) {
 	p := path.Join(d, "f.mkv")
 	os.WriteFile(p, b, os.ModePerm)
 
+	t.Logf("initial cksum...")
 	cksum, _ := asses.Cksum(context.Background(), p)
 
+	t.Logf("one && one...")
 	if err := asses.One(ctx, p); err != nil {
 		t.Fatal(err)
 	} else if err := asses.One(ctx, p); err != nil {
 		t.Fatal(err)
 	}
 
+	t.Logf("test -f...")
 	if _, err := os.Stat(p); err != nil {
 		t.Fatalf("lost original mkv: %v", err)
 	} else if _, err := os.Stat(path.Join(d, "f.srt")); err != nil {
 		t.Fatalf("no new srt: %v", err)
 	}
 
+	t.Logf("final cksum...")
 	newCksum, _ := asses.Cksum(context.Background(), p)
 	if cksum == newCksum {
 		t.Fatalf("cksum unchanged")