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