public void HeaderPage_Savepoint()
{
var data = new byte[Constants.PAGE_SIZE];
var buffer = new PageBuffer(data, 0, 1);
// mark buffer as writable (debug propose)
buffer.ShareCounter = Constants.BUFFER_WRITABLE;
// create new header page
var header = new HeaderPage(buffer, 0);
header.InsertCollection("my-col1", 1);
header.InsertCollection("my-col2", 2);
header.GetCollections().Count().Should().Be(2);
// savepoint alse execute UpdateBuffer
var sp = header.Savepoint();
header.DeleteCollection("my-col1");
header.DeleteCollection("my-col2");
header.UpdateBuffer();
header.GetCollections().Count().Should().Be(0);
// now, restore header
header.Restore(sp);
header.GetCollections().Count().Should().Be(2);
buffer.ShareCounter = 0;
}