public void PickItem_RandomSelectionReflectsDefinedProbability()
{
const string NotExpected = "First Item";
const string SometimesExpectedItem = "Second Item";
const string MostlyExpected = "Third Item";
RandomAssignmentExperiment <string> target = new RandomAssignmentExperiment <string>();
target.Add(new RandomAssignmentExperimentItem <string>(NotExpected)
{
OddsNumerator = 0 // 0 chance
});
target.Add(new RandomAssignmentExperimentItem <string>(SometimesExpectedItem)
{
OddsNumerator = 2 // 2/5 chance, or 40%
});
target.Add(new RandomAssignmentExperimentItem <string>(MostlyExpected)
{
OddsNumerator = 3 // 3/5 chance, or 60%
});
const int PickCount = 10000;
List <string> actuals = new List <string>(PickCount);
// TODO: Use Parallel.For when we upgrade to .NET 4.0.
for (int i = 0; i < PickCount; i++)
{
string actual = target.PickItem();
actuals.Add(actual);
Assert.AreNotEqual(actual, NotExpected);
}
Assert.AreEqual(PickCount, actuals.Count);
int sometimesExpectedItemCount = actuals.Count(item => item.Equals(SometimesExpectedItem));
int mostlyExpectedItemCount = actuals.Count(item => item.Equals(MostlyExpected));
Assert.AreEqual(PickCount, sometimesExpectedItemCount + mostlyExpectedItemCount);
Assert.IsTrue(
sometimesExpectedItemCount < mostlyExpectedItemCount,
string.Format("Sometimes: {0}. Mostly: {1}", sometimesExpectedItemCount, mostlyExpectedItemCount));
//// Verify split was within 50 picks, or 5% of a "perfect" outcome (400:600)
Assert.IsTrue(sometimesExpectedItemCount >= 3750, "Anomalous result (sometimesExpectedItemCount): " + sometimesExpectedItemCount);
Assert.IsTrue(sometimesExpectedItemCount <= 4250, "Anomalous result (sometimesExpectedItemCount): " + sometimesExpectedItemCount);
Assert.IsTrue(mostlyExpectedItemCount >= 5750, "Anomalous result (mostlyExpectedItemCount): " + mostlyExpectedItemCount);
Assert.IsTrue(mostlyExpectedItemCount <= 6250, "Anomalous result (mostlyExpectedItemCount): " + mostlyExpectedItemCount);
}
public void OddsDenominator_IsSumOfNumerators()
{
RandomAssignmentExperiment<string> target = new RandomAssignmentExperiment<string>();
target.Add(new RandomAssignmentExperimentItem<string>("First Item")
{
OddsNumerator = 0
});
target.Add(new RandomAssignmentExperimentItem<string>("Second Item")
{
OddsNumerator = 1
});
target.Add(new RandomAssignmentExperimentItem<string>("Third Item")
{
OddsNumerator = 2
});
int actual = target.OddsDenominator;
Assert.AreEqual(actual, 3);
}
public void OddsDenominator_IsSumOfNumerators()
{
RandomAssignmentExperiment <string> target = new RandomAssignmentExperiment <string>();
target.Add(new RandomAssignmentExperimentItem <string>("First Item")
{
OddsNumerator = 0
});
target.Add(new RandomAssignmentExperimentItem <string>("Second Item")
{
OddsNumerator = 1
});
target.Add(new RandomAssignmentExperimentItem <string>("Third Item")
{
OddsNumerator = 2
});
int actual = target.OddsDenominator;
Assert.AreEqual(actual, 3);
}
public void OddsNumerator_IsAlwaysSelectedWhenProbabilityIs100Percent()
{
string expected = "Second Item";
RandomAssignmentExperiment<string> target = new RandomAssignmentExperiment<string>();
target.Add(new RandomAssignmentExperimentItem<string>("First Item")
{
OddsNumerator = 0
});
target.Add(new RandomAssignmentExperimentItem<string>(expected)
{
OddsNumerator = 1
});
target.Add(new RandomAssignmentExperimentItem<string>("Third Item")
{
OddsNumerator = 0
});
for (int i = 0; i < 100; i++)
{
string actual = target.PickItem();
Assert.AreEqual(actual, expected);
}
}
public void OddsNumerator_IsAlwaysSelectedWhenProbabilityIs100Percent()
{
string expected = "Second Item";
RandomAssignmentExperiment <string> target = new RandomAssignmentExperiment <string>();
target.Add(new RandomAssignmentExperimentItem <string>("First Item")
{
OddsNumerator = 0
});
target.Add(new RandomAssignmentExperimentItem <string>(expected)
{
OddsNumerator = 1
});
target.Add(new RandomAssignmentExperimentItem <string>("Third Item")
{
OddsNumerator = 0
});
for (int i = 0; i < 100; i++)
{
string actual = target.PickItem();
Assert.AreEqual(actual, expected);
}
}
public void PickItem_RandomSelectionReflectsDefinedProbability()
{
const string NotExpected = "First Item";
const string SometimesExpectedItem = "Second Item";
const string MostlyExpected = "Third Item";
RandomAssignmentExperiment<string> target = new RandomAssignmentExperiment<string>();
target.Add(new RandomAssignmentExperimentItem<string>(NotExpected)
{
OddsNumerator = 0 // 0 chance
});
target.Add(new RandomAssignmentExperimentItem<string>(SometimesExpectedItem)
{
OddsNumerator = 2 // 2/5 chance, or 40%
});
target.Add(new RandomAssignmentExperimentItem<string>(MostlyExpected)
{
OddsNumerator = 3 // 3/5 chance, or 60%
});
const int PickCount = 10000;
List<string> actuals = new List<string>(PickCount);
// TODO: Use Parallel.For when we upgrade to .NET 4.0.
for (int i = 0; i < PickCount; i++)
{
string actual = target.PickItem();
actuals.Add(actual);
Assert.AreNotEqual(actual, NotExpected);
}
Assert.AreEqual(PickCount, actuals.Count);
int sometimesExpectedItemCount = actuals.Count(item => item.Equals(SometimesExpectedItem));
int mostlyExpectedItemCount = actuals.Count(item => item.Equals(MostlyExpected));
Assert.AreEqual(PickCount, sometimesExpectedItemCount + mostlyExpectedItemCount);
Assert.IsTrue(
sometimesExpectedItemCount < mostlyExpectedItemCount,
string.Format("Sometimes: {0}. Mostly: {1}", sometimesExpectedItemCount, mostlyExpectedItemCount));
//// Verify split was within 50 picks, or 5% of a "perfect" outcome (400:600)
Assert.IsTrue(sometimesExpectedItemCount >= 3750, "Anomalous result (sometimesExpectedItemCount): " + sometimesExpectedItemCount);
Assert.IsTrue(sometimesExpectedItemCount <= 4250, "Anomalous result (sometimesExpectedItemCount): " + sometimesExpectedItemCount);
Assert.IsTrue(mostlyExpectedItemCount >= 5750, "Anomalous result (mostlyExpectedItemCount): " + mostlyExpectedItemCount);
Assert.IsTrue(mostlyExpectedItemCount <= 6250, "Anomalous result (mostlyExpectedItemCount): " + mostlyExpectedItemCount);
}
