public async Task PostStream() { using (MockHttpServer.PostStreamReturnByteArray(async x => await x.ReadToEndAsync())) { var input = new byte[] { 3, 1, 6, 9, 38 }; var client = HttpApiClient <IPostStream> .Create("http://localhost:8844/path"); var result = await client.PostStream(new MemoryStream(input)); Assert.IsTrue(result.SequenceEqual(input)); } }