public void TestDetermineBackupsToKeep_Adv1()
{
BackupRotate br_oneday = new BackupRotate(TimeSpan.FromDays(1));
DateTime oldest = new DateTime(2000, 1, 1);
List <DateTime> backupDates = new List <DateTime>();
//StringBuilder sb = new StringBuilder();
DateTime newest;
for (int i = 0; i < 9999; i++)
{
newest = oldest.AddDays(i);
backupDates.Add(newest);
backupDates = new List <DateTime>(br_oneday.DetermineBackupsToKeep(backupDates));
Assert.AreEqual(newest, backupDates[0], "Newest kept date was " + backupDates[0] + ", expected " + newest);
Assert.AreEqual(oldest, backupDates[backupDates.Count - 1], "Oldest kept date was " + backupDates[backupDates.Count - 1] + ", expected " + oldest);
if (i > 2)
{
// These conditions should be true for i >= 3
Assert.IsTrue(backupDates.Count >= Math.Log(i, 2), "backupDates.Count was " + backupDates.Count + " at i=" + i + ". Expected >= " + Math.Log(i, 2));
Assert.IsTrue(backupDates.Count <= (2 * Math.Log(i, 2)), "backupDates.Count was " + backupDates.Count + " at i=" + i + ". Expected <= " + (2 * Math.Log(i, 2)));
}
//sb.AppendLine(string.Join(", ", backupDates.Select(d => d.ToString("yyyy/MM/dd"))));
}
//string result = sb.ToString();
//Console.WriteLine(result);
}
public void TestDetermineBackupsToKeep_Adv2()
{
BackupRotate br_oneday = new BackupRotate(TimeSpan.FromDays(1));
DateTime oldest = new DateTime(2000, 1, 1);
List <DateTime> backupDates = new List <DateTime>();
//StringBuilder sb = new StringBuilder();
DateTime newest;
int done = 0;
Random rand = new Random();
for (int i = 0; i < 9999; i++)
{
if (i < 3 || rand.NextDouble() < 0.5)
{
newest = oldest.AddDays(i);
backupDates.Add(newest);
backupDates = new List <DateTime>(br_oneday.DetermineBackupsToKeep(backupDates));
Assert.AreEqual(newest, backupDates[0], "Newest kept date was " + backupDates[0] + ", expected " + newest);
Assert.AreEqual(oldest, backupDates[backupDates.Count - 1], "Oldest kept date was " + backupDates[backupDates.Count - 1] + ", expected " + oldest);
if (done > 2)
{
// These conditions should be true for done >= 3
// We can't guarantee a minimum size beyond 2
Assert.IsTrue(backupDates.Count >= 2, "backupDates.Count was " + backupDates.Count + " at done=" + done + ". Expected >= 2.");
Assert.IsTrue(backupDates.Count <= (2 * Math.Log(done, 2)), "backupDates.Count was " + backupDates.Count + " at done=" + done + ". Expected <= " + (2 * Math.Log(done, 2)));
}
//sb.AppendLine(i + ": " + string.Join(", ", backupDates.Select(d => d.ToString("yyyy/MM/dd"))));
done++;
}
}
//string result = sb.ToString();
//Console.WriteLine(result);
}
public void TestDetermineBackupsToKeep_Basic()
{
BackupRotate br_oneday = new BackupRotate(TimeSpan.FromDays(1));
List <DateTime> input1 = new List <DateTime>();
for (int i = 1; i <= 28; i++)
{
input1.Add(new DateTime(2022, 2, i));
}
DateTime[] expected1k = new DateTime[]
{
new DateTime(2022, 2, 28),
new DateTime(2022, 2, 27),
new DateTime(2022, 2, 25),
new DateTime(2022, 2, 21),
new DateTime(2022, 2, 13),
new DateTime(2022, 2, 1)
};
DateTime[] actual1k = br_oneday.DetermineBackupsToKeep(input1);
AssertArraysEqual(expected1k, actual1k);
}