public void TestSetPositionReadWrite()
{
string filePath = Path.Combine(TestContext.CurrentContext.TestDirectory, "WinFileIOTests.TestSetPositionReadWrite");
byte[] buffer = new byte[1];
WinFileIO wfio = new WinFileIO(buffer);
wfio.OpenForReadingWriting(filePath);
Assert.AreEqual(0, wfio.Position);
//Write stuff, move about writing more, then come back in & read it in etc...
buffer[0] = 1;
wfio.WriteBlocks(1);
buffer[0] = 3;
wfio.WriteBlocks(1);
buffer[0] = 3;
wfio.WriteBlocks(1);
buffer[0] = 7;
wfio.WriteBlocks(1);
wfio.Position = 0;
wfio.ReadBlocks(1);
Assert.AreEqual(1, buffer[0]);
wfio.ReadBlocks(1);
Assert.AreEqual(3, buffer[0]);
wfio.ReadBlocks(1);
Assert.AreEqual(3, buffer[0]);
wfio.ReadBlocks(1);
Assert.AreEqual(7, buffer[0]);
wfio.Position = 2;
buffer[0] = 24;
wfio.WriteBlocks(1);
wfio.Position = 0;
buffer[0] = 10;
wfio.WriteBlocks(1);
wfio.Position = 2;
wfio.ReadBlocks(1);
Assert.AreEqual(24, buffer[0]);
wfio.Position = 0;
wfio.ReadBlocks(1);
Assert.AreEqual(10, buffer[0]);
wfio.Close();
//Now check that the final file is what we expected it to be
byte[] expected = new byte[] { 10, 3, 24, 7 };
byte[] actual = readFile(filePath);
CollectionAssert.AreEqual(expected, actual);
}
