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);
}