public async Task CopyToAsync_ThrowCustomExceptionInOverriddenMethod_ThrowsMockException()
        {
            var content = new MockContent(new MockException(), MockOptions.ThrowInSerializeMethods);

            var m = new MemoryStream();
            await Assert.ThrowsAsync<MockException>(() => content.CopyToAsync(m));
        }

        public void CopyToAsync_ThrowCustomExceptionInOverriddenAsyncMethod_ExceptionBubblesUp()
        {
            var content = new MockContent(new MockException(), MockOptions.ThrowInAsyncSerializeMethods);

            var m = new MemoryStream();
            Assert.Throws<MockException>(() => { Task t = content.CopyToAsync(m); });
        }

        public async Task CopyToAsync_ThrowIOExceptionInOverriddenMethod_ThrowsWrappedHttpRequestException()
        {
            var content = new MockContent(new IOException(), MockOptions.ThrowInSerializeMethods);

            Task t = content.CopyToAsync(new MemoryStream());
            HttpRequestException ex = await Assert.ThrowsAsync<HttpRequestException>(() => t);
            Assert.IsType<IOException>(ex.InnerException);
        }

        public async Task CopyToAsync_ThrowObjectDisposedExceptionInOverriddenAsyncMethod_ThrowsWrappedHttpRequestException()
        {
            var content = new MockContent(new ObjectDisposedException(""), MockOptions.ThrowInAsyncSerializeMethods);

            var m = new MemoryStream();
            HttpRequestException ex = await Assert.ThrowsAsync<HttpRequestException>(() => content.CopyToAsync(m));
            Assert.IsType<ObjectDisposedException>(ex.InnerException);
        }

        public async Task CopyToAsync_CallWithMockContent_MockContentMethodCalled()
        {
            var content = new MockContent(MockOptions.CanCalculateLength);
            var m = new MemoryStream();

            await content.CopyToAsync(m);

            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            Assert.Equal(content.GetMockData(), m.ToArray());
        }

        public void Dispose_DisposeObject_ContentGetsDisposedAndSettersWillThrowButGettersStillWork()
        {
            var rm = new HttpResponseMessage(HttpStatusCode.OK);
            var content = new MockContent();
            rm.Content = content;
            Assert.False(content.IsDisposed);

            rm.Dispose();
            rm.Dispose(); // Multiple calls don't throw.

            Assert.True(content.IsDisposed);
            Assert.Throws<ObjectDisposedException>(() => { rm.StatusCode = HttpStatusCode.BadRequest; });
            Assert.Throws<ObjectDisposedException>(() => { rm.ReasonPhrase = "Bad Request"; });
            Assert.Throws<ObjectDisposedException>(() => { rm.Version = new Version(1, 0); });
            Assert.Throws<ObjectDisposedException>(() => { rm.Content = null; });

            // Property getters should still work after disposing.
            Assert.Equal(HttpStatusCode.OK, rm.StatusCode);
            Assert.Equal("OK", rm.ReasonPhrase);
            Assert.Equal(new Version(1, 1), rm.Version);
            Assert.Equal(content, rm.Content);
        }

 public async Task CopyToAsync_UseStreamWriteByteWithBufferSizeSmallerThanContentSize_ThrowsHttpRequestException()
 {
     // MockContent uses stream.WriteByte() rather than stream.Write(): Verify that the max. buffer size
     // is also checked when using WriteByte().
     var content = new MockContent(MockOptions.UseWriteByteInCopyTo);
     await Assert.ThrowsAsync<HttpRequestException>(() => content.LoadIntoBufferAsync(content.GetMockData().Length - 1));
 }

        public async Task CopyToAsync_BufferContentFirst_UseBufferedStreamAsSource()
        {
            var data = new byte[10];
            var content = new MockContent(data);
            content.LoadIntoBufferAsync().Wait();

            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            var destination = new MemoryStream();
            await content.CopyToAsync(destination);

            // Our MockContent should not be called for the CopyTo() operation since the buffered stream should be 
            // used.
            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            Assert.Equal(data.Length, destination.Length);
        }

        public void Dispose_DisposeContentThenAccessContentLength_Throw()
        {
            var content = new MockContent();

            // This is not really typical usage of the type, but let's make sure we consider also this case: The user
            // keeps a reference to the Headers property before disposing the content. Then after disposing, the user
            // accesses the ContentLength property.
            var headers = content.Headers;
            content.Dispose();
            Assert.Throws<ObjectDisposedException>(() => headers.ContentLength.ToString());
        }

        public async Task LoadIntoBufferAsync_ThrowIOExceptionInOverriddenAsyncMethod_ThrowsHttpRequestException()
        {
            var content = new MockContent(new IOException(), MockOptions.ThrowInAsyncSerializeMethods);

            HttpRequestException ex = await Assert.ThrowsAsync<HttpRequestException>(() => content.LoadIntoBufferAsync());
            Assert.IsType<IOException>(ex.InnerException);
        }

        public async Task Dispose_GetReadStreamThenDispose_ReadStreamGetsDisposed()
        {
            var content = new MockContent();
            MockMemoryStream s = (MockMemoryStream) await content.ReadAsStreamAsync();
            Assert.Equal(1, content.CreateContentReadStreamCount);

            Assert.Equal(0, s.DisposeCount);
            content.Dispose();
            Assert.Equal(1, s.DisposeCount);
        }

        public async Task ReadAsStringAsync_SetNoCharset_DefaultCharsetUsed()
        {
            // Use content with umlaut characters.
            string sourceString = "ÄäüÜ"; // c4 e4 fc dc
            Encoding defaultEncoding = Encoding.GetEncoding("utf-8");
            byte[] contentBytes = defaultEncoding.GetBytes(sourceString);

            var content = new MockContent(contentBytes);

            // Reading the string should consider the charset of the 'Content-Type' header.
            string result = await content.ReadAsStringAsync();

            Assert.Equal(sourceString, result);
        }

        public async Task ReadAsStreamAsync_GetFromBufferedContent_CreateContentReadStreamCalled()
        {
            var content = new MockContent(MockOptions.CanCalculateLength);
            await content.LoadIntoBufferAsync();

            Stream stream = await content.ReadAsStreamAsync();

            Assert.Equal(0, content.CreateContentReadStreamCount);
            Assert.Equal(content.GetMockData().Length, stream.Length);
            Stream stream2 = await content.ReadAsStreamAsync();
            Assert.Same(stream, stream2);
            Assert.Equal(0, stream.Position);
            Assert.Equal((byte)'d', stream.ReadByte());
        }

        public async Task LoadIntoBufferAsync_CallOnMockContentWithLessLengthThanContentLengthHeader_BufferedStreamLengthMatchesActualLengthNotContentLengthHeaderValue()
        {
            byte[] data = Encoding.UTF8.GetBytes("16 bytes of data");
            var content = new MockContent(data);
            content.Headers.ContentLength = 32; // Set the Content-Length header to a value > actual data length.
            Assert.Equal(32, content.Headers.ContentLength);

            await content.LoadIntoBufferAsync();

            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            Assert.NotNull(content.Headers.ContentLength);
            Assert.Equal(32, content.Headers.ContentLength);
            Stream stream = await content.ReadAsStreamAsync();
            Assert.Equal(data.Length, stream.Length);
        }

        public async Task Dispose_DisposedObjectThenAccessMembers_ThrowsObjectDisposedException()
        {
            var content = new MockContent();
            content.Dispose();

            var m = new MemoryStream();

            await Assert.ThrowsAsync<ObjectDisposedException>(() => content.CopyToAsync(m));
            await Assert.ThrowsAsync<ObjectDisposedException>(() => content.ReadAsByteArrayAsync());
            await Assert.ThrowsAsync<ObjectDisposedException>(() => content.ReadAsStringAsync());
            await Assert.ThrowsAsync<ObjectDisposedException>(() => content.ReadAsStreamAsync());
            await Assert.ThrowsAsync<ObjectDisposedException>(() => content.LoadIntoBufferAsync());

            // Note that we don't throw when users access the Headers property. This is useful e.g. to be able to 
            // read the headers of a content, even though the content is already disposed. Note that the .NET guidelines
            // only require members to throw ObjectDisposedExcpetion for members "that cannot be used after the object 
            // has been disposed of".
            _output.WriteLine(content.Headers.ToString());
        }

        public void TryComputeLength_ThrowCustomExceptionInOverriddenMethod_ExceptionBubblesUpToCaller()
        {
            var content = new MockContent(MockOptions.ThrowInTryComputeLength); 

            var m = new MemoryStream();
            Assert.Throws<MockException>(() => content.Headers.ContentLength);
        }

        public async Task LoadIntoBufferAsync_CallOnMockContentWithNullContentLength_CopyToAsyncMemoryStreamCalled()
        {
            var content = new MockContent();
            Assert.Null(content.Headers.ContentLength);
            await content.LoadIntoBufferAsync();
            Assert.NotNull(content.Headers.ContentLength);
            Assert.Equal(content.MockData.Length, content.Headers.ContentLength);

            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            Stream stream = await content.ReadAsStreamAsync();
            Assert.False(stream.CanWrite);
        }

 public async Task LoadIntoBufferAsync_BufferSizeSmallerThanContentSizeWithNullContentLength_ThrowsHttpRequestException()
 {
     var content = new MockContent();
     await Assert.ThrowsAsync<HttpRequestException>(() => content.LoadIntoBufferAsync(content.GetMockData().Length - 1));
 }

        public async Task ReadAsStreamAsync_UseBaseImplementation_ContentGetsBufferedThenMemoryStreamReturned()
        {
            var content = new MockContent(MockOptions.DontOverrideCreateContentReadStream);
            Stream stream = await content.ReadAsStreamAsync();

            Assert.NotNull(stream);
            Assert.Equal(1, content.SerializeToStreamAsyncCount);
            Stream stream2 = await content.ReadAsStreamAsync();
            Assert.Same(stream, stream2);
            Assert.Equal(0, stream.Position);
            Assert.Equal((byte)'d', stream.ReadByte());
        }

        public async Task ReadAsStreamAsync_FirstGetFromUnbufferedContentThenGetFromBufferedContent_SameStream()
        {
            var content = new MockContent(MockOptions.CanCalculateLength);

            Stream before = await content.ReadAsStreamAsync();
            Assert.Equal(1, content.CreateContentReadStreamCount);

            await content.LoadIntoBufferAsync();

            Stream after = await content.ReadAsStreamAsync();
            Assert.Equal(1, content.CreateContentReadStreamCount);

            // Note that ContentReadStream returns always the same stream. If the user gets the stream, buffers content,
            // and gets the stream again, the same instance is returned. Returning a different instance could be 
            // confusing, even though there shouldn't be any real world scenario for retrieving the read stream both
            // before and after buffering content.
            Assert.Equal(before, after);
        }