t.Errorf("filesets not identical: %s", err)
	}
}

func TestSerialization(t *testing.T) {
	p := NewFileSet()
	checkSerialize(t, p)
	// add some files
	for i := 0; i < 10; i++ {
		f := p.AddFile(fmt.Sprintf("file%d", i), p.Base()+i, i*100)
		checkSerialize(t, p)
		// add some lines and alternative file infos
		line := 1000
		for offs := 0; offs < f.Size(); offs += 40 + i {
			f.AddLine(offs)