public void MatchFilled()
{
IMaybe <int> sut = new Just <int>(42);
var actual = sut.Accept(new MatchFilledMaybeVisitor <int>());
Assert.Equal("42", actual);
}
public void SimpleQueryExpressionWorks()
{
IMaybe <int> sut = new Just <int>(42);
IMaybe <string> actual = from i in sut
select i.ToString();
Assert.Equal(
"42",
actual.Accept(new FromMaybeVisitor <string>("nothing")));
}
public void MultiplyTwoNaturalNumbersUsingQueryExpression()
{
var mx = new Just <INaturalNumber>(NaturalNumber.Nine);
var my = new Just <INaturalNumber>(NaturalNumber.Four);
var actual = from x in mx
from y in my
select x.Multiply(y);
Assert.Equal(
36,
actual
.Accept(
new FromMaybeVisitor <INaturalNumber>(
NaturalNumber.Zero))
.Count());
}