public void MakeSureTheBlockChecksArgumentsBeforeWritingAnything()
{
var virtualDisk = VirtualDiskTestFactory.ConstructDefaultTestDisk();
DiskBlock block = new DiskBlock(virtualDisk, 10, 0, 0);
ExceptionAssert.MakeSureExceptionIsRaisedBy <ArgumentNullException>(
delegate
{
block.WriteBytes(null, 10, 11);
});
ExceptionAssert.MakeSureExceptionIsRaisedBy <ArgumentException>(
delegate
{
block.WriteBytes(new byte[2], 10, 11);
});
ExceptionAssert.MakeSureExceptionIsRaisedBy <ArgumentOutOfRangeException>(
delegate
{
block.WriteBytes(new byte[2], -10, 11);
});
ExceptionAssert.MakeSureExceptionIsRaisedBy <ArgumentOutOfRangeException>(
delegate
{
block.WriteBytes(new byte[2], 10, -1);
});
}
public void MakeSureThePositionChangesAsYouAreWritingToTheBlock()
{
var virtualDisk = VirtualDiskTestFactory.ConstructDefaultTestDisk();
DiskBlock block = new DiskBlock(virtualDisk, 10, 0, 0);
Assert.AreEqual(0, block.Position);
block.WriteBytes(new byte[15], 0, 15);
Assert.AreEqual(15, block.Position); // после последнего записанного байта.
block.WriteBytes(new byte[15], 9, 6);
Assert.AreEqual(21, block.Position); // после последнего записанного байта.
}
public void TryWriteReadCycleForABuffer()
{
var virtualDisk = VirtualDiskTestFactory.ConstructDefaultTestDisk();
DiskBlock block = new DiskBlock(virtualDisk, 10, 0, 0);
for (int i = 0; i < 2048 / 4; i++)
{
byte[] fourByteBlock = new byte[4];
MemoryStream writerStream = new MemoryStream(fourByteBlock);
BinaryWriter writer = new BinaryWriter(writerStream);
writer.Write(i);
block.WriteBytes(fourByteBlock, 0, fourByteBlock.Length);
}
byte[] allBytes = block.ReadAll();
MemoryStream readerStream = new MemoryStream(allBytes);
BinaryReader reader = new BinaryReader(readerStream);
for (int i = 0; i < 2048 / 4; i++)
{
Assert.AreEqual(i, reader.ReadInt32());
}
Assert.IsFalse(block.CanAcceptBytesAtCurrentPosition);
}