test that heroes are tracked by the party

Assets/Scripts/HeroPartySO.cs

@@ -12,4 +12,5 @@ public class HeroPartySO : ScriptableObject
 
     public void Add(HeroUnit unit) { unitList.Add(unit); }
     public void Remove(HeroUnit unit) { unitList.Remove(unit); }
+    public int Count => unitList.Count;
 }

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.
@@ -25,4 +28,9 @@ public class HeroUnit : MonoBehaviour
     {
         party.Remove(this);
     }
+
+    internal HeroPartySO getParty()
+    {
+        return party;
+    }
 }