public void Position_WhenNotCanSeek_ThrowsNotSupportedException()
{
var stub = new FakeStream { OnCanReadGet = () => true, OnCanSeekGet = () => false };
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.Throws<NotSupportedException>(() => pushbackStream.Position);
}
}
public void CanWrite_WhenNotCanSeek_ReturnsFalse()
{
using (var stub = new FakeStream { OnCanReadGet = () => true, OnCanSeekGet = () => true })
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.False(pushbackStream.CanWrite);
}
}
public void CanWrite_WhenNotCanSeek_ReturnsFalse()
{
using (var stub = new FakeStream {
OnCanReadGet = () => true, OnCanSeekGet = () => true
})
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.False(pushbackStream.CanWrite);
}
}
public void CanWrite_WhenCanSeek_ReturnsTrue()
{
var stub = new FakeStream { OnCanReadGet = () => true, OnCanSeekGet = () => false };
var sut = new PushbackInputStream(stub);
using (stub)
using (sut)
{
Assert.True(sut.CanWrite);
}
}
public void Position_WhenNotCanSeek_ThrowsNotSupportedException()
{
var stub = new FakeStream {
OnCanReadGet = () => true, OnCanSeekGet = () => false
};
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.Throws <NotSupportedException>(() => pushbackStream.Position);
}
}
public void Position_WhenCanSeek_ReturnsPositionOfUnderlyingStream()
{
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => true,
OnPositionGet = () => 128
};
using (var pushbackStream = new PushbackInputStream(stub))
{
var position = pushbackStream.Position;
Assert.Equal(128, position);
}
}
public void CanWrite_WhenCanSeek_ReturnsTrue()
{
var stub = new FakeStream {
OnCanReadGet = () => true, OnCanSeekGet = () => false
};
var sut = new PushbackInputStream(stub);
using (stub)
using (sut)
{
Assert.True(sut.CanWrite);
}
}
public void Position_WhenCanSeek_ReturnsPositionOfUnderlyingStream()
{
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => true,
OnPositionGet = () => 128
};
using (var pushbackStream = new PushbackInputStream(stub))
{
var position = pushbackStream.Position;
Assert.Equal(128, position);
}
}
public void Write_WhenCanSeek_ThrowsIOException()
{
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => true,
OnPositionGet = () => 128
};
var pushbackBytes = new byte[8];
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.Throws <IOException>(() => pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length));
}
}
public void Write_DoesNotWriteToUnderlyingStream()
{
var callsToWrite = 0;
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanWriteGet = () => true,
OnCanSeekGet = () => false,
OnWriteByteArrayInt32Int32 = (_, __, ___) => callsToWrite++
};
var sut = new PushbackInputStream(stub);
using (sut)
{
var buffer = new byte[] { 0x8a, 0x8f, 0x1c, 0xdd, 0x7a, 0xa7, 0xd0, 0x99, 0xa3, 0x4b };
sut.Write(buffer, 0, 10);
}
Assert.Equal(0, callsToWrite);
}
public async void ReadAsync_ReadsFromBufferFirst()
{
const int Position = 128;
var callsToRead = 0;
// MEMO: all calls to PushbackInputStream.ReadAsync(...) are routed to PushbackInputStream.Read(...)
// if we mocked FakeStream.ReadAsync(...), it would never be called
// that is why the synchronous method is mocked instead
var mock = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => false,
OnPositionGet = () => Position,
OnReadByteArrayInt32Int32 = (_, __, ___) =>
{
callsToRead++;
return(0);
}
};
using (var pushbackStream = new PushbackInputStream(mock))
{
var pushbackBytes = new byte[] { 1, 2, 4, 8 };
pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length);
// Read as many bytes as we wrote to the pusback buffer
// The stream wrapper should not touch the underlying stream
var result = new byte[pushbackBytes.Length];
var bytesRead = await pushbackStream.ReadAsync(result, 0, result.Length);
Assert.Equal(0, callsToRead);
Assert.Equal(pushbackBytes.Length, bytesRead);
Assert.Equal(pushbackBytes, result);
// The pushback buffer should be empty at this point;
// a subsequent read should hit the underlying stream
await pushbackStream.ReadAsync(result, 0, result.Length, CancellationToken.None);
Assert.Equal(1, callsToRead);
}
}
public void Read_ReadsFromBufferFirst()
{
const int Position = 128;
var callsToRead = 0;
var mock = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => false,
OnPositionGet = () => Position,
OnReadByteArrayInt32Int32 = (_, __, ___) =>
{
callsToRead++;
return(0);
}
};
using (var pushbackStream = new PushbackInputStream(mock))
{
var pushbackBytes = new byte[] { 1, 2, 4, 8 };
pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length);
// Read as many bytes as we wrote to the pusback buffer
// The stream wrapper should not touch the underlying stream
var result = new byte[pushbackBytes.Length];
var bytesRead = pushbackStream.Read(result, 0, result.Length);
Assert.Equal(0, callsToRead);
Assert.Equal(pushbackBytes.Length, bytesRead);
Assert.Equal(pushbackBytes, result);
// The pushback buffer should be empty at this point;
// a subsequent read should hit the underlying stream
pushbackStream.Read(result, 0, result.Length);
Assert.Equal(1, callsToRead);
}
}
public async void WriteAsync_DoesNotWriteToUnderlyingStream()
{
var callsToWrite = 0;
// MEMO: all calls to PushbackInputStream.WriteAsync(...) are routed to PushbackInputStream.Write(...)
// if we mocked FakeStream.WriteAsync(...), it would never be called
// that is why the synchronous method is mocked instead
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanWriteGet = () => true,
OnCanSeekGet = () => false,
OnWriteByteArrayInt32Int32 = (_, __, ___) => callsToWrite++
};
var sut = new PushbackInputStream(stub);
using (sut)
{
var buffer = new byte[] { 0x8a, 0x8f, 0x1c, 0xdd, 0x7a, 0xa7, 0xd0, 0x99, 0xa3, 0x4b };
await sut.WriteAsync(buffer, 0, 10, CancellationToken.None);
}
Assert.Equal(0, callsToWrite);
}
public async void ReadAsync_ReadsFromBufferFirst()
{
const int Position = 128;
var callsToRead = 0;
// MEMO: all calls to PushbackInputStream.ReadAsync(...) are routed to PushbackInputStream.Read(...)
// if we mocked FakeStream.ReadAsync(...), it would never be called
// that is why the synchronous method is mocked instead
var mock = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => false,
OnPositionGet = () => Position,
OnReadByteArrayInt32Int32 = (_, __, ___) =>
{
callsToRead++;
return 0;
}
};
using (var pushbackStream = new PushbackInputStream(mock))
{
var pushbackBytes = new byte[] { 1, 2, 4, 8 };
pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length);
// Read as many bytes as we wrote to the pusback buffer
// The stream wrapper should not touch the underlying stream
var result = new byte[pushbackBytes.Length];
var bytesRead = await pushbackStream.ReadAsync(result, 0, result.Length);
Assert.Equal(0, callsToRead);
Assert.Equal(pushbackBytes.Length, bytesRead);
Assert.Equal(pushbackBytes, result);
// The pushback buffer should be empty at this point;
// a subsequent read should hit the underlying stream
await pushbackStream.ReadAsync(result, 0, result.Length, CancellationToken.None);
Assert.Equal(1, callsToRead);
}
}
public void Write_DoesNotWriteToUnderlyingStream()
{
var callsToWrite = 0;
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanWriteGet = () => true,
OnCanSeekGet = () => false,
OnWriteByteArrayInt32Int32 = (_, __, ___) => callsToWrite++
};
var sut = new PushbackInputStream(stub);
using (sut)
{
var buffer = new byte[] { 0x8a, 0x8f, 0x1c, 0xdd, 0x7a, 0xa7, 0xd0, 0x99, 0xa3, 0x4b };
sut.Write(buffer, 0, 10);
}
Assert.Equal(0, callsToWrite);
}
public void Write_WhenCanSeek_ThrowsIOException()
{
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => true,
OnPositionGet = () => 128
};
var pushbackBytes = new byte[8];
using (var pushbackStream = new PushbackInputStream(stub))
{
Assert.Throws<IOException>(() => pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length));
}
}
public async void WriteAsync_DoesNotWriteToUnderlyingStream()
{
var callsToWrite = 0;
// MEMO: all calls to PushbackInputStream.WriteAsync(...) are routed to PushbackInputStream.Write(...)
// if we mocked FakeStream.WriteAsync(...), it would never be called
// that is why the synchronous method is mocked instead
var stub = new FakeStream
{
OnCanReadGet = () => true,
OnCanWriteGet = () => true,
OnCanSeekGet = () => false,
OnWriteByteArrayInt32Int32 = (_, __, ___) => callsToWrite++
};
var sut = new PushbackInputStream(stub);
using (sut)
{
var buffer = new byte[] { 0x8a, 0x8f, 0x1c, 0xdd, 0x7a, 0xa7, 0xd0, 0x99, 0xa3, 0x4b };
await sut.WriteAsync(buffer, 0, 10, CancellationToken.None);
}
Assert.Equal(0, callsToWrite);
}
public void Read_ReadsFromBufferFirst()
{
const int Position = 128;
var callsToRead = 0;
var mock = new FakeStream
{
OnCanReadGet = () => true,
OnCanSeekGet = () => false,
OnPositionGet = () => Position,
OnReadByteArrayInt32Int32 = (_, __, ___) =>
{
callsToRead++;
return 0;
}
};
using (var pushbackStream = new PushbackInputStream(mock))
{
var pushbackBytes = new byte[] { 1, 2, 4, 8 };
pushbackStream.Write(pushbackBytes, 0, pushbackBytes.Length);
// Read as many bytes as we wrote to the pusback buffer
// The stream wrapper should not touch the underlying stream
var result = new byte[pushbackBytes.Length];
var bytesRead = pushbackStream.Read(result, 0, result.Length);
Assert.Equal(0, callsToRead);
Assert.Equal(pushbackBytes.Length, bytesRead);
Assert.Equal(pushbackBytes, result);
// The pushback buffer should be empty at this point;
// a subsequent read should hit the underlying stream
pushbackStream.Read(result, 0, result.Length);
Assert.Equal(1, callsToRead);
}
}
