public static void TestDisposedAccess()
{
using var buffer = new ResizableBuffer();
// Write our expected columns to the parquet in-memory file.
using var outStream = new BufferOutputStream(buffer);
using var fileWriter = new ParquetFileWriter(outStream, new Column[] { new Column <int>("Index") });
fileWriter.Dispose();
var exception = Assert.Throws <NullReferenceException>(() => fileWriter.AppendRowGroup());
Assert.AreEqual("null native handle", exception.Message);
}