public async Task Test_JsonRequestBody_ReturnsOkObjectResult() { // Arrange using var stream = new MemoryStream( System.Text.Encoding.UTF8.GetBytes("{\"name\":\"jan\"}") ); Mock.Get(request) .SetupGet(r => r.Body) .Returns(stream); // Act var response = await GreeterFunction .ExecuteAsync(request, logger) .ConfigureAwait(false); // Assert Assert.IsInstanceOf <OkObjectResult>(response); }