public void ThreeItems()
{
var dict = new SmallDictionary <int, string>();
dict[2] = "abc";
dict[5] = "def";
dict[11] = "third";
Assert.AreEqual(3, dict.Count);
Assert.AreEqual("abc", dict[2]);
Assert.AreEqual("def", dict[5]);
Assert.AreEqual("third", dict[11]);
string output;
Assert.IsFalse(dict.TryGetValue(3, out output));
Assert.IsNull(output);
Assert.IsTrue(dict.TryGetValue(2, out output));
Assert.AreEqual("abc", output);
Assert.IsTrue(dict.TryGetValue(5, out output));
Assert.AreEqual("def", output);
Assert.IsTrue(dict.TryGetValue(11, out output));
Assert.AreEqual("third", output);
Assert.IsFalse(dict.ContainsKey(3));
Assert.IsTrue(dict.ContainsKey(2));
Assert.IsTrue(dict.ContainsKey(5));
Assert.IsTrue(dict.ContainsKey(11));
}
public void OneItem()
{
var dict = new SmallDictionary <int, string>();
dict[2] = "abc";
Assert.AreEqual(1, dict.Count);
Assert.AreEqual("abc", dict[2]);
string output;
Assert.IsFalse(dict.TryGetValue(3, out output));
Assert.IsNull(output);
Assert.IsTrue(dict.TryGetValue(2, out output));
Assert.AreEqual("abc", output);
Assert.IsFalse(dict.ContainsKey(3));
Assert.IsTrue(dict.ContainsKey(2));
}
public void Remove()
{
var dict = new SmallDictionary <int, string>();
Assert.IsFalse(dict.Remove(2), "Remove a missing item from an empty dictionary");
dict.Add(2, "abc");
Assert.IsFalse(dict.Remove(3), "Remove a missing item from a dictionary with one item");
Assert.IsTrue(dict.Remove(2), "Remove the only item from a dictionary");
Assert.AreEqual(0, dict.Count, "Nothing remains after removing the only item");
dict.Add(2, "abc");
dict.Add(5, "def");
dict.Add(11, "third");
Assert.IsFalse(dict.Remove(7), "Remove a missing item from a dictionary with three items");
Assert.IsTrue(dict.Remove(2), "Remove the first item from a dictionary with three items");
Assert.AreEqual(2, dict.Count, "Two items remain after removing the first of three");
string output;
Assert.IsFalse(dict.TryGetValue(2, out output), "Removed item (first) should be gone from original three");
Assert.AreEqual("def", dict[5]);
Assert.AreEqual("third", dict[11]);
dict.Add(2, "abc");
Assert.IsTrue(dict.Remove(5), "Remove first of two items in others");
Assert.AreEqual(2, dict.Count);
Assert.IsFalse(dict.TryGetValue(5, out output));
Assert.AreEqual("abc", dict[2]);
Assert.AreEqual("third", dict[11]);
Assert.IsTrue(dict.Remove(2), "Remove only item in others");
Assert.AreEqual(1, dict.Count);
Assert.IsFalse(dict.TryGetValue(2, out output));
Assert.AreEqual("third", dict[11]);
Assert.IsTrue(dict.Remove(11), "Remove only item in dictionary which previously had three");
Assert.AreEqual(0, dict.Count);
Assert.IsFalse(dict.TryGetValue(11, out output));
dict.Add(2, "abc");
dict.Add(5, "def");
dict.Add(11, "third");
dict.Add(13, "fourth");
Assert.IsTrue(dict.Remove(11), "Remove middle of three items in others");
Assert.AreEqual(3, dict.Count);
Assert.IsFalse(dict.TryGetValue(11, out output));
Assert.AreEqual("abc", dict[2]);
Assert.AreEqual("def", dict[5]);
Assert.AreEqual("fourth", dict[13]);
Assert.IsTrue(dict.Remove(13), "Remove last of two items in others");
Assert.AreEqual(2, dict.Count);
Assert.IsFalse(dict.TryGetValue(13, out output));
Assert.AreEqual("abc", dict[2]);
Assert.AreEqual("def", dict[5]);
Assert.IsTrue(dict.Remove(2), "Remove first item when others contains exactly one");
Assert.AreEqual(1, dict.Count);
Assert.IsFalse(dict.TryGetValue(2, out output));
Assert.AreEqual("def", dict[5]);
}
public void Empty()
{
var dict = new SmallDictionary <int, string>();
Assert.AreEqual(0, dict.Count);
string output;
Assert.IsFalse(dict.TryGetValue(2, out output));
Assert.IsNull(output);
Assert.IsFalse(dict.ContainsKey(3));
}