public void InvoicingForPeriod_ReturnsDataForGivenPeriod() { // Arrange var periodType = PeriodType.Month; // Act var data = _statisticsClient.InvoicingForPeriod(periodType).AssertResult(); // Assert Assert.Greater(data.IssuedInvoices.Count, 0); Assert.IsNotNull(data.IssuedInvoices.First().Period); Assert.IsNotEmpty(data.IssuedInvoices.First().Period); Assert.Greater(data.ReceivedInvoices.Count, 0); Assert.IsNotNull(data.ReceivedInvoices.First().Period); Assert.IsNotEmpty(data.ReceivedInvoices.First().Period); }