// Write content to file
		w, f := makeOffsetWriter(name)
		defer f.Close()
		for _, value := range []byte(content) {
			n, err := w.Write([]byte{value})
			if err != nil {
				t.Fatalf("Write failed, n: %d, err: %v", n, err)
			}
		}
		checkContent(name, f)

		// Copy -> Write
		// Copy file f to file f2
		name = "Copy"
		w2, f2 := makeOffsetWriter(name)
		defer f2.Close()
		Copy(w2, f)