test that heroes are tracked by the party

Assets/Prefabs/Hero.prefab

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+  unitList: []

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Assets/Scripts/HeroPartySO.cs

@@ -0,0 +1,16 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using UnityEngine;
+
+[CreateAssetMenu(fileName = "HeroParty", menuName = "Hero Party")]
+public class HeroPartySO : ScriptableObject
+{
+    [SerializeField]
+    private List<HeroUnit> unitList = new List<HeroUnit>();
+    public ReadOnlyCollection<HeroUnit> UnitList => unitList.AsReadOnly();
+
+    public void Add(HeroUnit unit) { unitList.Add(unit); }
+    public void Remove(HeroUnit unit) { unitList.Remove(unit); }
+    public int Count => unitList.Count;
+}

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Assets/Scripts/HeroUnit.cs

@@ -2,6 +2,9 @@ using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
+using System.Runtime.CompilerServices;
+[assembly: InternalsVisibleTo("TestsPlaymode")]
+
 /// <summary>
 /// Component that makes a duder a duder.
 /// Manages class, skills, level, attrs, and AI.
@@ -13,4 +16,21 @@ public class HeroUnit : MonoBehaviour
     [SerializeField] private long level;
     [SerializeField] private long xp;
     [SerializeField] private HeroAttributesSO attrs;
+    [SerializeField] private HeroPartySO party;
+
+    private void OnEnable()
+    {
+        // NOTE(zeph): Party is mandatory. If none is set, we want an exception.
+        party.Add(this);
+    }
+
+    private void OnDisable()
+    {
+        party.Remove(this);
+    }
+
+    internal HeroPartySO getParty()
+    {
+        return party;
+    }
 }

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Assets/TestsPlaymode/HeroPartyTest.cs

@@ -0,0 +1,24 @@
+using System.Collections;
+using System.Collections.Generic;
+using NUnit.Framework;
+using UnityEditor;
+using UnityEngine;
+using UnityEngine.TestTools;
+
+public class HeroPartyTest
+{
+    [UnityTest]
+    public IEnumerator HeroPartyGetsAllTheHeroes()
+    {
+        var prefab = AssetDatabase.LoadAssetAtPath<GameObject>("Assets/Prefabs/Hero.prefab");
+        Assert.IsNotNull(prefab);
+        var instance = Object.Instantiate(prefab);
+        var hero = instance.GetComponent<HeroUnit>();
+        var party = hero.getParty();
+        yield return null;
+        Assert.AreEqual(1, party.Count);
+        Object.Destroy(instance);
+        yield return null;
+        Assert.IsEmpty(party.UnitList);
+    }
+}

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