public async Task NoDataWritten_FlushAsync_DoesNotFlushUnderlyingStream()
{
// Arrange
var stream = new TestMemoryStream();
var writer = new HttpResponseStreamWriter(stream, Encoding.UTF8);
// Act
await writer.FlushAsync();
// Assert
Assert.Equal(0, stream.FlushAsyncCallCount);
Assert.Equal(0, stream.Length);
}
public async Task FlushesBuffer_ButNotStream_OnFlushAsync(int byteLength)
{
// Arrange
var stream = new TestMemoryStream();
var writer = new HttpResponseStreamWriter(stream, Encoding.UTF8);
await writer.WriteAsync(new string('a', byteLength));
var expectedWriteCount = Math.Ceiling((double)byteLength / HttpResponseStreamWriter.DefaultBufferSize);
// Act
await writer.FlushAsync();
// Assert
Assert.Equal(0, stream.FlushAsyncCallCount);
Assert.Equal(expectedWriteCount, stream.WriteAsyncCallCount);
Assert.Equal(byteLength, stream.Length);
}
public async Task HttpResponseStreamWriter_WritesDataCorrectly_ForCharactersHavingSurrogatePairs(int characterSize)
{
// Arrange
// Here "𐐀" (called Deseret Long I) actually represents 2 characters. Try to make this character split across
// the boundary
var content = new string('a', characterSize - 1) + "𐐀";
var stream = new TestMemoryStream();
var writer = new HttpResponseStreamWriter(stream, Encoding.Unicode);
// Act
await writer.WriteAsync(content);
await writer.FlushAsync();
// Assert
stream.Seek(0, SeekOrigin.Begin);
var streamReader = new StreamReader(stream, Encoding.Unicode);
var actualContent = await streamReader.ReadToEndAsync();
Assert.Equal(content, actualContent);
}
public async Task FlushWriteThrows_DontFlushInDispose(int byteLength)
{
// Arrange
var stream = new TestMemoryStream()
{
ThrowOnWrite = true
};
var writer = new HttpResponseStreamWriter(stream, Encoding.UTF8);
await writer.WriteAsync(new string('a', byteLength));
await Assert.ThrowsAsync <IOException>(() => writer.FlushAsync());
// Act
writer.Dispose();
// Assert
Assert.Equal(1, stream.WriteAsyncCallCount);
Assert.Equal(0, stream.WriteCallCount);
Assert.Equal(0, stream.FlushCallCount);
Assert.Equal(0, stream.FlushAsyncCallCount);
Assert.Equal(0, stream.Length);
}
