Added additional missing equality operators for HexCell.

HexCell.cs

@@ -1,11 +1,25 @@
 using System;
 using System.Diagnostics;
 using System.Linq;
+using System.Runtime.CompilerServices;
 using Godot;
 using Array = Godot.Collections.Array;
 
-public class HexCell : Resource, IEquatable<HexCell>
+public class HexCell : IEquatable<HexCell>
 {
+    public override bool Equals(object obj)
+    {
+        if (ReferenceEquals(null, obj)) return false;
+        if (ReferenceEquals(this, obj)) return true;
+        if (obj.GetType() != this.GetType()) return false;
+        return Equals((HexCell)obj);
+    }
+
+    public override int GetHashCode()
+    {
+        return _cubeCoords.GetHashCode();
+    }
+
     public static readonly Vector2 size = new Vector2(1, Mathf.Sqrt(3) / 2);
     public static readonly Vector3 DIR_N = new Vector3(0, 1, -1);
     public static readonly Vector3 DIR_NE = new Vector3(1, 0, -1);
@@ -36,6 +50,16 @@ public class HexCell : Resource, IEquatable<HexCell>
         return CubeCoords == other.CubeCoords;
     }
 
+    public static bool operator ==(HexCell cellA, HexCell cellB)
+    {
+        return Equals(cellA, cellB);
+    }
+    
+    public static bool operator !=(HexCell cellA, HexCell cellB)
+    {
+        return !(cellA == cellB);
+    }
+    
     public HexCell(Vector3 cubeCoords)
     {
         CubeCoords = cubeCoords;

tests/HexCellTests.cs

@@ -27,9 +27,14 @@ public class HexCellTests : TestClass
         cellA.AxialCoords = new Vector2(2, 3);
         cellB.AxialCoords = new Vector2(2, 3);
         Assert.Equal(cellA, cellB);
+        bool result = cellA == cellB;
+        Assert.True(cellA == cellB);
+        Assert.False(cellA != cellB);
         
         cellB.AxialCoords = new Vector2(3, 2);
         Assert.NotEqual(cellA, cellB);
+        Assert.False(cellA == cellB);
+        Assert.True(cellA != cellB);        
     }
 
     [Test]