public async Task GetByRecordId_ShouldReturnMatchingRecordId() { // arrange object FMrecordIdMapper(User o, int id) => o.FileMakerRecordId = id; var mockHttp = new MockHttpMessageHandler(); var server = "http://localhost"; var file = "test-file"; var user = "******"; var pass = "******"; var layout = "Users"; var recordId = 26; mockHttp.When(HttpMethod.Post, $"{server}/fmi/data/v1/databases/{file}/sessions") .Respond("application/json", DataApiResponses.SuccessfulAuthentication()); mockHttp.When(HttpMethod.Get, $"{server}/fmi/data/v1/databases/{file}/layouts/{layout}/records/{recordId}") .Respond("application/json", DataApiResponses.SuccessfulGetById(recordId)); var fdc = new FileMakerRestClient(mockHttp.ToHttpClient(), server, file, user, pass); // act var response = await fdc.GetByFileMakerIdAsync <User>(layout, recordId, FMrecordIdMapper); // assert Assert.Equal(recordId, response.FileMakerRecordId); }