public function testGetColumnDescriptions()
{
$data = new DataTable();
$col0 = new ColumnDescription('foo', ValueType::STRING);
$col1 = new ColumnDescription('bar', ValueType::NUMBER);
$data->addColumns(array($col0, $col1));
$columns = $data->getColumnDescriptions();
$this->assertSame(2, count($columns), "data must contain 2 columns");
$this->assertEquals($col0, $columns[0], "first column id must match");
$this->assertEquals($col1, $columns[1], "first column id must match");
}
