using MathInterpreter.Core;

namespace MathInterpreter.Test;

public sealed class ScanResultTests
{
    [Fact]
    public void ScanResult_Construction_Valid()
    {
        const int ExpectedValue = -123;
        const int ExpectedLength = 3;
        const string ExpectedRemainingExpression = "abc";

        var result = new ScanResult<int>(ExpectedValue, ExpectedLength, ExpectedRemainingExpression);

        result.Value.Should().Be(ExpectedValue);
        result.Length.Should().Be(ExpectedLength);
        result.RemainingExpression.ToString().Should().Be(ExpectedRemainingExpression);
    }

    [Fact]
    public void ScanResult_Construction_Invalid()
    {
        var action = () =>
        {
            var _ = new ScanResult<int>(1, -2, string.Empty);
        };

        action.Should().Throw<ArgumentOutOfRangeException>()
              .WithMessage("Length must be non-negative (Parameter 'length')");
    }
}