rc, err = OpenReader(path)
		if err == nil {
			defer rc.Close()
			z = &rc.Reader
		}
		var err2 error
		raw, err2 = os.ReadFile(path)
		if err2 != nil {
			t.Errorf("ReadFile(%s) error=%v", path, err2)
			return
		}
	}
	if err != zt.Error {
		t.Errorf("error=%v, want %v", err, zt.Error)
		return
	}

	// bail if file is not zip
	if err == ErrFormat {
		return
	}

			var cnt int
			var err error
			for {
				if _, err = tr.Next(); err != nil {
					break
				}
				cnt++
				if s2 == "manual" {
					if _, err = tr.writeTo(io.Discard); err != nil {
						break
					}
				}
			}
			if err != v.err {
				t.Errorf("test %d, NewReader(%s) with %s discard: got %v, want %v",
					i, s1, s2, err, v.err)
			}
			if cnt != v.cnt {

		n, err := r.Read(buf)
		if err != tt.readerr {
			t.Errorf("%d. read = %v; want %v", i, err, tt.readerr)
			continue
		}
		got := string(buf[:n])
		if got != tt.want {
			t.Errorf("%d. got %q; want %q", i, got, tt.want)
		}
	}
}

func TestReadAfterBigSeek(t *testing.T) {
	r := NewReader([]byte("0123456789"))
	if _, err := r.Seek(1<<31+5, io.SeekStart); err != nil {
		t.Fatal(err)
	}