public void AddingNewItemGivenCacheFullShouldRemoveLru(Fixture fixture, LeastRecentlyUsedCache <int, string> sut) { // Arrange for (int i = 0; i < sut.Capacity; i++) { var key = fixture.Create <int>(); sut.AddEntry(key, fixture.Create <string>()); } var currentLru = sut.GetLeastRecentlyUsedEntry(); var newKey = fixture.Create <int>(); var newValue = fixture.Create <string>(); // Act sut.AddEntry(newKey, newValue); var actual = sut.ContainsKey(currentLru.Key); // Assert actual.ShouldBeFalse(); }