PKHeX/Tests/PKHeX.Core.Tests/PKM/StatTest.cs

using System;
using FluentAssertions;
using Xunit;

namespace PKHeX.Core.Tests.PKM;

public class StatTest
{
    [Fact]
    public void CalcStatsGB()
    {
        var pk = new PK2
        {
            Species = (int) Species.Gyarados,
            CurrentLevel = 38,
            IV_HP = 0,
            IV_ATK = 14,
            IV_DEF = 10,
            IV_SPC = 10,
            IV_SPE = 10,
            EV_HP = 5120, // 2 HP Ups

            Move1 = 45, // Growl (PP 40)
            Move2 = 45, // Growl (PP 40)
            Move3 = 45, // Growl (PP 40)
            Move1_PPUps = 1,
            Move2_PPUps = 2,
            Move3_PPUps = 3,
        };

        pk.ResetPartyStats();
        pk.Stat_Level.Should().Be(pk.CurrentLevel, "stat level");
        pk.Stat_HPCurrent.Should().Be(127, "stat re-calculation");

        pk.HealPP();
        pk.Move1_PP.Should().Be(47, "pp calc oddity");
        pk.Move2_PP.Should().Be(54, "pp calc oddity");
        pk.Move3_PP.Should().Be(61, "pp calc oddity");
    }

    [Fact]
    public void CalcStatsGBPidgeot()
    {
        var pk = new PK2
        {
            Species = (ushort)Species.Pidgeot,
            CurrentLevel = 100,
            IV_HP = 15,
            IV_ATK = 15,
            IV_DEF = 15,
            IV_SPC = 15,
            IV_SPE = 15,
            EV_HP = 63504,
            EV_ATK = 63504,
            EV_DEF = 63504,
            EV_SPC = 63504,
            EV_SPE = 63001,
        };

        ushort effort = 63001;
        effort = (ushort)(Math.Min((ushort)255, (ushort)Math.Ceiling(Math.Sqrt(effort))) >> 2);
        var iv = 15;
        var level = 100;
        var baseStat = 91;
        var expect = (ushort)((((2 * (baseStat + iv)) + effort) * level / 100) + 5);
        expect.Should().Be(279);
        
        pk.ResetPartyStats();
        pk.Stat_Level.Should().Be(pk.CurrentLevel, "stat level");
        pk.Stat_HPCurrent.Should().Be(369, "stat re-calculation");

        pk.Stat_HPMax.Should().Be(369, "stat re-calculation");
        pk.Stat_ATK.Should().Be(258, "stat re-calculation");
        pk.Stat_DEF.Should().Be(248, "stat re-calculation");
        pk.Stat_SPA.Should().Be(238, "stat re-calculation");
        pk.Stat_SPE.Should().Be(279, "stat re-calculation");
    }
}

public class BelugaTests
{
    [Theory]
    [InlineData(41, 25, 91)]
    public void CalculateCP(int level, int statSum, int expect)
    {
        var result1 = (((level * 4.0f / 100.0f) + 2.0f) * (statSum & 0xFFFF));
        var result2 = (int)result1;

        result2.Should().Be(expect);
    }
}