mrgameeng/tests/MrGameEng.AI.Tests/BlackboardTests.cs

using Microsoft.Xna.Framework;
using MrGameEng.AI;
using Xunit;

namespace MrGameEng.AI.Tests;

public class BlackboardTests
{
    [Fact]
    public void SetThenTryGet_RoundTripsTypedValues()
    {
        var board = new Blackboard();
        board.Set("target", new Vector2(3f, 4f));

        Assert.True(board.TryGet<Vector2>("target", out var value));
        Assert.Equal(new Vector2(3f, 4f), value);
    }

    [Fact]
    public void TryGet_ReturnsFalse_OnMissingKeyOrTypeMismatch()
    {
        var board = new Blackboard();
        board.Set("count", 5);

        Assert.False(board.TryGet<int>("missing", out _));
        Assert.False(board.TryGet<string>("count", out _)); // wrong type
    }

    [Fact]
    public void GetOrDefault_FallsBackWhenAbsent()
    {
        var board = new Blackboard();

        Assert.Equal(42, board.GetOrDefault("hp", 42));
        board.Set("hp", 7);
        Assert.Equal(7, board.GetOrDefault("hp", 42));
    }

    [Fact]
    public void Set_OverwritesExistingValue()
    {
        var board = new Blackboard();
        board.Set("k", 1);
        board.Set("k", 2);

        Assert.Equal(2, board.GetOrDefault("k", 0));
        Assert.Equal(1, board.Count);
    }

    [Fact]
    public void RemoveAndClear_DropKeys()
    {
        var board = new Blackboard();
        board.Set("a", 1);
        board.Set("b", 2);

        Assert.True(board.Remove("a"));
        Assert.False(board.Remove("a"));
        Assert.True(board.Has("b"));

        board.Clear();
        Assert.Equal(0, board.Count);
    }
}