public void GenerateCombination_OnlyOneFeature_ResultingListContainsOnlyOneFeature()
{
// Arrange
var candidate = new RandomCombinationGenerator(new FakeRandomizer(4231));
// Act
var combination = candidate.GenerateCombination(new[]
{
this._feature1,
});
// Assert
Assert.AreEqual(1, combination.Features.Count);
Assert.AreEqual(this._feature1, combination.Features[0]);
}
public void GenerateCombination_WildRandomIndices_ResultingListContainsAllFeature()
{
// Arrange
var candidate = new RandomCombinationGenerator(new FakeRandomizer(53, 895348, 765));
// Act
var combination = candidate.GenerateCombination(new[]
{
this._feature1,
this._feature2,
this._feature3,
});
// Assert
Assert.AreEqual(3, combination.Features.Count);
Assert.IsTrue(combination.Features.Contains(this._feature1));
Assert.IsTrue(combination.Features.Contains(this._feature2));
Assert.IsTrue(combination.Features.Contains(this._feature3));
}
public void GenerateCombination_RandomIndexIsAlwaysLastPosition_ResultingOrderIsInverted()
{
// Arrange
var candidate = new RandomCombinationGenerator(new FakeRandomizer(2, 1, 0));
// Act
var combination = candidate.GenerateCombination(new[]
{
this._feature1,
this._feature2,
this._feature3
});
// Assert
Assert.AreEqual(3, combination.Features.Count);
Assert.AreEqual(this._feature3, combination.Features[0]);
Assert.AreEqual(this._feature2, combination.Features[1]);
Assert.AreEqual(this._feature1, combination.Features[2]);
}
public void GenerateCombination_LargeFeatureSet_ResultingListContainsAllFeature()
{
// Arrange
var candidate = new RandomCombinationGenerator(new FakeRandomizer(
6282527,
8424440,
2490841,
10467771,
2148918,
12670802));
var numberOfFeatures = 13523;
var features = new List <Feature>();
for (int i = 0; i < numberOfFeatures; i++)
{
features.Add(new Feature("Feature XY", 1, 3));
}
// Act
var combination = candidate.GenerateCombination(features);
// Assert
Assert.AreEqual(numberOfFeatures, combination.Features.Count);
foreach (var feature in features)
{
// Each feature is contained in the combination.
Assert.IsTrue(combination.Features.Contains(feature));
// Non of the features in the combinations have the same position as in the original
// feature list. This is not always guaranteed, but is the case for the specified
// input feature list and generated "random" numbers.
var combinationFeatures = combination.Features.ToList();
Assert.AreNotEqual(
features.IndexOf(feature),
combinationFeatures.IndexOf(feature));
}
}