public void Range_can_represent_a_sequence_of_one_item()
{
var r = SequenceRange.From(Sequence.First, Sequence.First);
r.Lower.Should().Be(Sequence.First);
r.Upper.Should().Be(Sequence.First);
}
public void Can_determine_if_sequence_is_in_range()
{
var r = SequenceRange.From(Sequence.First, Sequence.First.Add(2));
r.Includes(Sequence.First).Should().BeTrue();
r.Includes(Sequence.First.Add(1)).Should().BeTrue();
r.Includes(Sequence.First.Add(2)).Should().BeTrue();
r.Includes(Sequence.First.Add(3)).Should().BeFalse();
}
public void Range_can_represent_a_sequence_of_many_items()
{
var lower = Sequence.First;
var upper = lower.Add(10);
var r = SequenceRange.From(lower, upper);
r.Lower.Should().Be(lower);
r.Upper.Should().Be(upper);
}
public void Supports_value_equality()
{
const int lower = 5;
const int upper = 10;
var r = SequenceRange.From(Sequence.First.Add(lower), Sequence.First.Add(upper));
var same = SequenceRange.From(Sequence.First.Add(lower), Sequence.First.Add(upper));
var toHighUpper = SequenceRange.From(Sequence.First, Sequence.First.Add(upper + 1));
var toHighLower = SequenceRange.From(Sequence.First.Add(lower + 1), Sequence.First.Add(upper));
var toLowLower = SequenceRange.From(Sequence.First.Add(lower - 1), Sequence.First.Add(upper));
var toLowUpper = SequenceRange.From(Sequence.First.Add(lower - 1), Sequence.First.Add(upper));
bool Compare(SequenceRange s) => r == s;
Compare(same).Should().BeTrue();
Compare(toHighLower).Should().BeFalse();
Compare(toHighUpper).Should().BeFalse();
Compare(toLowLower).Should().BeFalse();
Compare(toLowUpper).Should().BeFalse();
}
public void Requires_logic_order_of_range()
{
Action failing = () => SequenceRange.From(Sequence.Max, Sequence.First);
failing.Should().ThrowExactly <ArgumentException>().WithMessage("Range must be from low to high.");
}
