public void HeaderPage_Collections()
{
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);
((int)header.GetCollectionPageID("my-col1")).Should().Be(1);
((int)header.GetCollectionPageID("my-col2")).Should().Be(2);
header.GetAvaiableCollectionSpace().Should().Be(7981);
header.UpdateBuffer();
// read header
var h2 = new HeaderPage(buffer);
h2.GetCollections().Count().Should().Be(2);
((int)h2.GetCollectionPageID("my-col1")).Should().Be(1);
((int)h2.GetCollectionPageID("my-col2")).Should().Be(2);
h2.GetAvaiableCollectionSpace().Should().Be(7981);
buffer.ShareCounter = 0;
}