card_game/tests/Game.Core.Tests/RunTests.cs

using CardGame.Core;
using Xunit;

namespace Game.Core.Tests;

public sealed class RunTests
{
    [Fact]
    public void Start_builds_starting_package_with_holders()
    {
        var run = RunProgress.Start(42, Cards.Catalog);
        Assert.Equal(16, run.Owned.Count);
        Assert.Contains(run.Owned, c => c.DefinitionId == "card.guard.patrol" && c.HolderId == Factions.Guard);
        Assert.Contains(run.Owned, c => c.DefinitionId == "card.cult.believer" && c.HolderId == Factions.Cult);
    }

    [Fact]
    public void CreateFromRun_applies_owned_stat_overrides()
    {
        var run = RunProgress.Start(7, Cards.Catalog);
        var patrol = run.Owned.First(c => c.DefinitionId == "card.guard.patrol");
        patrol.Cost = 0;
        patrol.Attack = 9;

        var state = MatchSetup.CreateFromRun(run, Cards.Catalog, shuffle: false);
        var inDeckOrHand = state.Players[0].Deck.Concat(state.Players[0].Hand)
            .First(e => e.Definition.Id == "card.guard.patrol" && e.Attack == 9);
        Assert.Equal(0, inDeckOrHand.Cost);
        Assert.Equal(9, inDeckOrHand.Attack);
        Assert.Equal(Factions.Guard, inDeckOrHand.HolderId);
        Assert.Equal(run.Stats.HealReceived, state.Players[0].Run.HealReceived);
    }

    [Fact]
    public void Reward_pool_includes_base_pack_cards()
    {
        var run = RunProgress.Start(1, Cards.Catalog);
        var state = MatchSetup.CreateFromRun(run, Cards.Catalog, shuffle: false);
        var packs = PackJson.LoadDirectory(Path.Combine(AppContext.BaseDirectory, "content", "packs"));
        var pool = RunRewards.ActivePool(state, 0, packs);
        Assert.Contains("card.example.spark", pool);
        Assert.Contains("card.example.wisp", pool);
    }

    [Fact]
    public void Adding_reward_with_holder_grows_owned_and_survives_next_fight_setup()
    {
        var run = RunProgress.Start(3, Cards.Catalog);
        var before = run.Owned.Count;
        RunRewards.AddCard(run, Cards.Spark, Factions.Guard);
        Assert.Equal(before + 1, run.Owned.Count);

        var upgraded = run.Owned[^1];
        Assert.True(RunRewards.ApplyUpgrade(upgraded, Cards.Spark, SimpleUpgrade.ReduceCost));
        Assert.Equal(Cards.Spark.Cost - 1, upgraded.Cost);

        var state = MatchSetup.CreateFromRun(run, Cards.Catalog, shuffle: false);
        var spark = state.Players[0].Deck.Concat(state.Players[0].Hand)
            .First(e => e.Definition.Id == Cards.Spark.Id);
        Assert.Equal(Cards.Spark.Cost - 1, spark.Cost);
        Assert.Equal(Factions.Guard, spark.HolderId);
    }

    [Fact]
    public void SyncStatsFrom_carries_pack_progress_into_next_fight()
    {
        var run = RunProgress.Start(9, Cards.Catalog);
        var state = MatchSetup.CreateFromRun(run, Cards.Catalog, shuffle: false);
        state.Players[0].Run.HealReceived = 4;
        state.Players[0].Run.AttacksDeclared = 2;
        run.SyncStatsFrom(state, 0);

        var next = MatchSetup.CreateFromRun(run, Cards.Catalog, shuffle: false);
        Assert.Equal(4, next.Players[0].Run.HealReceived);
        Assert.Equal(2, next.Players[0].Run.AttacksDeclared);
    }

    [Fact]
    public void RollOffer_is_deterministic_for_same_rng_stream()
    {
        var pool = new[] { "a", "b", "c", "d" };
        var a = RunRewards.RollOffer(new GameRng(99), pool, 3);
        var b = RunRewards.RollOffer(new GameRng(99), pool, 3);
        Assert.Equal(a, b);
        Assert.Equal(3, a.Count);
        Assert.Equal(a.Distinct().Count(), a.Count);
    }
}