public void SecondFunctorLawHoldsForMapNode(IRoseTree <int, string> t)
{
char f(bool b) => b ? 'T' : 'F';
bool g(int i) => i % 2 == 0;
Assert.Equal(
t.MapNode(x => f(g(x))),
t.MapNode(g).MapNode(f));
}
public void ConsistencyLawHolds(IRoseTree <int, string> t)
{
DateTime f(int i) => new DateTime(i);
bool g(string s) => string.IsNullOrWhiteSpace(s);
Assert.Equal(t.BiMap(f, g), t.MapLeaf(g).MapNode(f));
Assert.Equal(
t.MapNode(f).MapLeaf(g),
t.MapLeaf(g).MapNode(f));
}
public void MapNodeObeysFirstFunctoryLaw(IRoseTree <int, string> t)
{
Assert.Equal(t, t.MapNode(Id));
}