using TeamUp.SharedKernel.Metrics;
using Xunit;

namespace TeamUp.IntegrationTests;

/// <summary>Unit coverage for the north-star metric helper (no database).</summary>
public sealed class EditDistanceTests
{
    [Theory]
    [InlineData("", "", 0)]
    [InlineData("abc", "abc", 0)]
    [InlineData("", "abc", 3)]
    [InlineData("abc", "", 3)]
    [InlineData("kitten", "sitting", 3)]
    [InlineData("spec v1", "spec v2", 1)]
    public void Levenshtein_counts_edits(string a, string b, int expected) =>
        Assert.Equal(expected, EditDistance.Levenshtein(a, b));

    [Fact]
    public void Normalized_is_zero_when_unchanged() =>
        Assert.Equal(0d, EditDistance.Normalized("approved as-is", "approved as-is"));

    [Fact]
    public void Normalized_is_between_zero_and_one() =>
        Assert.InRange(EditDistance.Normalized("the AI wrote this", "the human edited this"), 0d, 1d);
}