private static ICollection <ICustomerOrderDataPoint> IdentifyCohorts(ICollection <ICustomer> customers)
{
var startDate = customers.OrderBy(c => c.CreatedDate).First().CreatedDate;
var dataLoader = new CustomerCohortLoader(startDate);
return(dataLoader.IdentifyCohorts(customers));
}
public void GetCohortIdentifierForDate()
{
DateTime startDate = DateTime.Parse("2015-01-01 00:00:00");
var customerCohortLoader = new CustomerCohortLoader(startDate);
var cohortDate = DateTime.Parse("2015-01-01 10:52:00");
Assert.AreEqual("1/1-1/7", customerCohortLoader.GetCohortIdentifierForDate(cohortDate));
cohortDate = DateTime.Parse("2015-01-08 02:22:36");
Assert.AreEqual("1/8-1/14", customerCohortLoader.GetCohortIdentifierForDate(cohortDate));
cohortDate = DateTime.Parse("2015-02-14 23:23:23");
Assert.AreEqual("2/12-2/18", customerCohortLoader.GetCohortIdentifierForDate(cohortDate));
}
public void TestLoadCustomerCohorts()
{
var customers = new List <ICustomer>
{
new Customer(1, DateTime.Parse("2015-01-01 10:52:00")),
new Customer(2, DateTime.Parse("2015-01-08 02:22:36")),
new Customer(3, DateTime.Parse("2015-02-14 23:23:23"))
};
DateTime startDate = DateTime.Parse("2015-01-01 00:00:00");
var customerCohortLoader = new CustomerCohortLoader(startDate);
ICollection <ICustomerOrderDataPoint> dataPoints = customerCohortLoader.IdentifyCohorts(customers);
Assert.AreEqual(3, dataPoints.Count);
var enumerator = dataPoints.GetEnumerator();
enumerator.MoveNext();
var dataPoint = enumerator.Current;
Assert.AreEqual(1, dataPoint.Id);
Assert.IsFalse(dataPoint.OrderDate.HasValue);
Assert.AreEqual(DateTime.Parse("2015-01-01 10:52:00"), dataPoint.CohortDate);
Assert.AreEqual("1/1-1/7", dataPoint.CohortIdentifier);
Assert.AreEqual(0, dataPoint.CohortPeriod);
enumerator.MoveNext();
dataPoint = enumerator.Current;
Assert.AreEqual(2, dataPoint.Id);
Assert.IsFalse(dataPoint.OrderDate.HasValue);
Assert.AreEqual(DateTime.Parse("2015-01-08 02:22:36"), dataPoint.CohortDate);
Assert.AreEqual("1/8-1/14", dataPoint.CohortIdentifier);
Assert.AreEqual(0, dataPoint.CohortPeriod);
enumerator.MoveNext();
dataPoint = enumerator.Current;
Assert.AreEqual(3, dataPoint.Id);
Assert.IsFalse(dataPoint.OrderDate.HasValue);
Assert.AreEqual(DateTime.Parse("2015-02-14 23:23:23"), dataPoint.CohortDate);
Assert.AreEqual("2/12-2/18", dataPoint.CohortIdentifier);
Assert.AreEqual(0, dataPoint.CohortPeriod);
}
