public void GetBuffer_calls_warmup_if_necessary()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => 50);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.GetBuffer();
streamMock.VerifyAll();
}
public void GetBuffer_returns_a_buffer_corresponding_to_GetNumBytesAvailable()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => 50);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
streamMock.VerifyAll();
Assert.AreEqual(buf.GetNumBytesAvailable(), buf.GetBuffer().Length);
}
public void GetBuffer_returns_a_buffer_with_valid_data()
{
int window = 100;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return actualLength;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
VerifyBufferPartialEquality(buffer, buf.GetBuffer());
}
public void Warmup_pulls_atleast_windowSize_data_from_stream()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
streamMock.Setup(x =>
x.Read(
It.IsAny<byte[]>(),
It.IsAny<int>(),
It.Is<int>(i => i >= window)))
.Returns((byte[] s, int o, int l) => l);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
streamMock.VerifyAll();
}
public void MoveForward_throws_for_zero_size()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => l);
var buf = new SlidingStreamBuffer(streamMock.Object, window, 0);
buf.Warmup();
buf.MoveForward(0);
}
public void MoveForward_stops_at_end_of_stream()
{
int window = 10;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var buf = new SlidingStreamBuffer(new MemoryStream(buffer), window);
buf.Warmup();
buf.MoveForward(window + 1);
}
public void MoveForward_shifts_index_for_byte_retrieval()
{
int window = 100;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return actualLength;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(buffer[5], buf[5]);
buf.MoveForward(1);
buf.MoveForward(3);
Assert.AreEqual(buffer[9], buf[5]);
}
public void GetByteAt_throws_exception_for_index_over_windowSize()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => window);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.GetByteAt(window);
}
public void MoveForward_pulls_at_most_windowSize_plus_extrabuffer_minus_totalValidBytes()
{
int window = 100;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
if (l > buffer.Length - o) Assert.Fail("Too much data being read");
return l;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window, window);
buf.Warmup();
buf.MoveForward(window + 1);
buf.MoveForward(1);
}
public void MoveForward_doesnt_cause_more_data_to_be_read_when_a_padding_buffer_is_supplied()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => l);
var buf = new SlidingStreamBuffer(streamMock.Object, window, 3);
buf.Warmup();
buf.MoveForward(1);
buf.MoveForward(1);
buf.MoveForward(1);
buf.GetByteAt(0);
streamMock.Verify(x =>
x.Read(
It.IsAny<byte[]>(),
It.IsAny<int>(),
It.IsAny<int>()),
Times.Exactly(1));
}
public void MoveForward_beyond_windowSize_with_no_more_data_in_stream_yields_NumAvailable_lower_than_windowSize()
{
int window = 10;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var buf = new SlidingStreamBuffer(new MemoryStream(buffer), window, window);
buf.Warmup();
buf.MoveForward(window + 1);
Assert.AreEqual(window - 1, buf.GetNumBytesAvailable());
}
public void Indexer_throw_exception_for_negative_index()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock).Returns((byte[] s, int o, int l) => 50);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
int i = buf[-1];
}
public void GetNumBytesAvailable_when_moved_to_end_of_stream_returns_zero()
{
int window = 10;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var buf = new SlidingStreamBuffer(new MemoryStream(buffer), window, window);
buf.Warmup();
buf.MoveForward(buffer.Length);
Assert.AreEqual(0, buf.GetNumBytesAvailable());
}
public void GetNumBytesAvailable_returns_windowSize_for_full_read()
{
int window = 100;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) => l);
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(window, buf.GetNumBytesAvailable());
}
public void MoveForward_pulls_data_to_the_correct_offset_when_less_than_windowSize_bytes_remain()
{
int window = 100;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
bool warmupFillComplete = false;
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
if (warmupFillComplete && o != window - 1) Assert.Fail("Wrong offset being read to");
warmupFillComplete = true;
return l;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window, window);
buf.Warmup();
buf.MoveForward(window + 1);
}
public void GetBuffer_when_moved_beyond_end_of_stream_yields_empty_buffer()
{
int window = 10;
var buffer = new byte[window*2];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var buf = new SlidingStreamBuffer(new MemoryStream(buffer), window, window);
buf.Warmup();
buf.MoveForward(buffer.Length + 1);
Assert.IsTrue(buf.GetBuffer().Length == 0);
}
public void GetByteAt_retrieves_correct_byte()
{
int window = 100;
var buffer = new byte[window];
for (int i = 0; i < buffer.Length; ++i) buffer[i] = (byte) (200 - i);
var streamMock = new Mock<MemoryStream>(MockBehavior.Strict);
SetupMockStreamRead(streamMock)
.Returns((byte[] s, int o, int l) =>
{
int actualLength = MathEx.Bounded(0, Math.Min(l, buffer.Length), buffer.Length);
Array.Copy(buffer, 0, s, o, actualLength);
return actualLength;
});
var buf = new SlidingStreamBuffer(streamMock.Object, window);
buf.Warmup();
Assert.AreEqual(buffer[5], buf.GetByteAt(5));
}