public void LookupGetWhenPresent()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup <int, string>(1);
Assert.AreSame("A", dict.Get(elementLens).Value);
}
public void ByKeyGetWhenNotPresent()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.ByKey <int, string>(2);
dict.Get(elementLens);
}
public void LookupGetWhenNotPresent()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup <int, string>(2);
Assert.AreSame(Maybe <string> .None, dict.Get(elementLens));
}
public void LookupGetDefaultedWhenPresent()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup(1, x => "B");
Assert.AreSame("A", dict.Get(elementLens));
}
public void LookupSetNothingRemovesEntry()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup <int, string>(1);
var updated = dict.Set(elementLens, Maybe <string> .None);
Assert.IsFalse(updated.Any());
}
public void ByKeySetUpdatesEntry()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.ByKey <int, string>(1);
var updated = dict.Set(elementLens, "B");
Assert.AreEqual(1, updated.Count());
Assert.AreEqual("B", updated[1]);
}
public void LookupSetDefaultedUpdatesEntry()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup(1, x => "C");
var updated = dict.Set(elementLens, "B");
Assert.AreEqual(1, updated.Count());
Assert.AreEqual("B", updated[1]);
}
public void LookupSetAddsEntry()
{
var dict = ImmutableDictionary <int, string> .Empty.Add(1, "A");
var elementLens = ImmutableDictionaryLens.Lookup <int, string>(2);
var updated = dict.Set(elementLens, "B".ToMaybe());
Assert.AreEqual(2, updated.Count());
Assert.AreEqual("A", updated[1]);
Assert.AreEqual("B", updated[2]);
}
