public static void FoldMapTreeEnum(Tree <int> t)
{
var expected = t.Select(x => x * 2).ToList();
var actual = t.FoldMap(Monoid.ListAppend <int>(), x => new List <int> {
x * 2
});
Assert.Equal(expected, actual);
}
public static void ListAppendMonoidTest()
{
var m = Monoid.ListAppend <int>();
var xs = new List <int> {
};
Assert.Empty(m.Neutral);
Assert.Equal(new int[] { 3, 4 }, m.Op(xs, new List <int> {
3, 4
}));
Assert.Equal(new int[] { 3, 4 }, xs);
xs = new List <int> {
};
Assert.Equal(new int[] { 3, 4 }, m.Op(new List <int> {
3, 4
}, xs));
Assert.Empty(xs);
}