public void FirstOrNothingTest()
{
var empty = new int[0];
var nonEmpty = new[] { 1, 2, 1, 2 };
AssertNothing(empty.FirstOrNothing());
AssertNothing(empty.FirstOrNothing(Fail<int, bool>));
AssertSome(nonEmpty.FirstOrNothing(), 1);
AssertSome(nonEmpty.FirstOrNothing(x => x == 2), 2);
AssertNothing(nonEmpty.FirstOrNothing(x => false));
}
public void FirstOrNothing_Single_HasValue()
{
var src = new[] { 42 };
var result = src.FirstOrNothing().HasValue;
Assert.True(result);
}
