public async Task AsHttpResponseData_ExceptionIsAnUnexpectedException_ReturnsResponseWithGenericErrorAndStatusInternalServerError() { // arrange var request = new MockedHttpRequestData(new MockedFunctionContext()); const string internalErrorMessage = "Something is not right"; var exception = new ArgumentNullException(internalErrorMessage); // act var actual = await exception.AsHttpResponseDataAsync(request.HttpRequestData).ConfigureAwait(false); var actualFunctionError = JsonSerializer.Deserialize <ErrorResponse>( ((MemoryStream)actual.Body).ToArray(), new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.CamelCase }) !; var error = actualFunctionError.Error; // assert Assert.Equal(HttpStatusCode.InternalServerError, actual.StatusCode); Assert.Equal("INTERNAL_ERROR", error.Code); Assert.Equal("An error occured while processing the request.", error.Message); Assert.Null(error.Target); Assert.Null(error.Details); }