public void ReadFromEmptyBufferReturnsNothing()
{
CircularBuffer circularBuffer = new CircularBuffer(1024);
byte[] buffer = new byte[1024];
int read = circularBuffer.Read(buffer, 0, 1024);
Assert.AreEqual(0, read);
}
public void CanWritePastEnd()
{
CircularBuffer circularBuffer = new CircularBuffer(100);
byte[] buffer = new byte[200];
circularBuffer.Write(buffer, 0, 75);
Assert.AreEqual(75, circularBuffer.Count, "Initial count");
int read = circularBuffer.Read(buffer, 0, 75);
Assert.AreEqual(0, circularBuffer.Count, "Count after read");
Assert.AreEqual(75, read, "Bytes read");
// write wraps round
circularBuffer.Write(buffer, 0, 50);
Assert.AreEqual(50, circularBuffer.Count, "Count after wrap round");
// read wraps round
read = circularBuffer.Read(buffer, 0, 75);
Assert.AreEqual(50, read, "Bytes Read 2");
Assert.AreEqual(0, circularBuffer.Count, "Final Count");
}
public void BufferReturnsAsMuchAsIsAvailable()
{
CircularBuffer circularBuffer = new CircularBuffer(1024);
byte[] buffer = new byte[100];
circularBuffer.Write(buffer, 0, 100);
Assert.AreEqual(100, circularBuffer.Count);
byte[] readBuffer = new byte[1000];
int read = circularBuffer.Read(readBuffer, 0, 1000);
Assert.AreEqual(100, read);
}
public void DataIntegrityTest()
{
byte[] numbers = new byte[256];
byte[] readBuffer = new byte[256];
for (int n = 0; n < 256; n++)
{
numbers[n] = (byte)n;
}
CircularBuffer circularBuffer = new CircularBuffer(300);
circularBuffer.Write(numbers, 0, 200);
Array.Clear(readBuffer, 0, readBuffer.Length);
int read = circularBuffer.Read(readBuffer, 0, 200);
Assert.AreEqual(200, read);
CheckBuffer(readBuffer, 0, read);
// now write past the end
circularBuffer.Write(numbers, 0, 200);
Array.Clear(readBuffer, 0, readBuffer.Length);
// now read past the end
read = circularBuffer.Read(readBuffer, 0, 200);
Assert.AreEqual(200, read);
CheckBuffer(readBuffer, 0, read);
}