public async Task GetAllAatfSentOnDataCsvHandler_VariousParameters_ReturnsFileContent(int complianceYear, string obligationType, Guid?authority, Guid?panArea) { var sentOnDataSet = CreateDummyDataSet(); A.CallTo(() => storedProcedures .GetAllAatfSentOnDataCsv(complianceYear, obligationType, authority, panArea)) .Returns(sentOnDataSet); var request = new GetAllAatfSentOnDataCsv(complianceYear, obligationType, authority, panArea); // Act var data = await handler.HandleAsync(request); // Assert Assert.NotEmpty(data.FileContent); }