public void AddValueOrOverrideTest()
{
var dictionary = new Dictionary <int, int> {
{ 1, 2 }
};
Dicts.AddValueOrOverride(dictionary, 1, 100);
Dicts.AddValueOrOverride(dictionary, 2, 200);
dictionary.Count.ShouldBe(2);
dictionary[1].ShouldBe(100);
dictionary[2].ShouldBe(200);
dictionary.AddValueOrOverride(1, 300);
dictionary.AddValueOrOverride(3, 400);
dictionary.Count.ShouldBe(3);
dictionary[1].ShouldBe(300);
dictionary[2].ShouldBe(200);
dictionary[3].ShouldBe(400);
}