public async Task PostByteArrayMultipart() { using (MockHttpServer.PostMultipartReturnByteArray(x => Task.FromResult(((ByteArrayHttpBody)x.Data["data"].Body).Data))) { var input = new byte[] { 3, 1, 8, 9, 15 }; var client = HttpApiClient <IPostByteArrayMultipart> .Create("http://localhost:8844/path"); var result = await client.PostByteArray(input); Assert.IsTrue(result.SequenceEqual(input)); } }