using FluentAssertions;
using foodmarket.Application.Common;
using Xunit;

namespace foodmarket.UnitTests;

public class RequiredGuidTests
{
    [Fact]
    public void Returns_null_when_all_present()
    {
        RequiredGuid.FirstMissing(
            ("storeId", Guid.NewGuid()),
            ("supplierId", Guid.NewGuid()),
            ("currencyId", Guid.NewGuid())
        ).Should().BeNull();
    }

    [Fact]
    public void Returns_first_missing_field_name()
    {
        RequiredGuid.FirstMissing(
            ("storeId", Guid.NewGuid()),
            ("supplierId", Guid.Empty),
            ("currencyId", Guid.Empty)
        ).Should().Be("supplierId");
    }

    [Fact]
    public void Returns_field_when_only_one_missing()
    {
        RequiredGuid.FirstMissing(
            ("storeId", Guid.Empty)
        ).Should().Be("storeId");
    }

    [Fact]
    public void Empty_input_returns_null()
        => RequiredGuid.FirstMissing().Should().BeNull();
}