t.Fatalf("test fs has file content %v; archive header has %v", origdata, data)
			}
		}
	}
	if entriesLeft > 0 {
		t.Fatalf("not all entries are in the archive")
	}
}

func TestWriterAddFSNonRegularFiles(t *testing.T) {
	fsys := fstest.MapFS{
		"device":  {Data: []byte("hello"), Mode: 0755 | fs.ModeDevice},
		"symlink": {Data: []byte("world"), Mode: 0755 | fs.ModeSymlink},
	}
	var buf bytes.Buffer