Add ToString override to DiffPiece

DiffPlex/DiffBuilder/Model/DiffPiece.cs

@@ -55,6 +55,13 @@ public override int GetHashCode()
             return hashCode;
         }
 
+        public override string ToString()
+        {
+            var position = Position?.ToString() ?? "-";
+            var subPieceCount = SubPieces?.Count ?? 0;
+            return $"Pos:{position,-6} Subs:{subPieceCount,-6} {Type,-16} {Text}";
+        }
+
         private bool SubPiecesEqual(DiffPiece other)
         {
             if (SubPieces is null)

Facts.DiffPlex/DiffPieceFacts.cs

@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using DiffPlex.DiffBuilder.Model;
+using Xunit;
+
+namespace Facts.DiffPlex
+{
+    public class DiffPieceFacts
+    {
+        public class ToStringMethod
+        {
+            [Fact]
+            public void Will_include_position_sub_piece_count_type_and_text()
+            {
+                var piece = new DiffPiece("hello", ChangeType.Modified, 3);
+                piece.SubPieces.Add(new DiffPiece("h", ChangeType.Unchanged, 1));
+                piece.SubPieces.Add(new DiffPiece("ello", ChangeType.Inserted, 2));
+
+                Assert.Equal("Pos:3      Subs:2      Modified         hello", piece.ToString());
+            }
+
+            [Fact]
+            public void Will_show_dash_when_position_is_null()
+            {
+                var piece = new DiffPiece("text", ChangeType.Inserted);
+
+                Assert.Equal("Pos:-      Subs:0      Inserted         text", piece.ToString());
+            }
+
+            [Fact]
+            public void Will_not_throw_when_sub_pieces_and_text_are_null()
+            {
+                var piece = new DiffPiece { SubPieces = null };
+
+                Assert.Equal("Pos:-      Subs:0      Imaginary        ", piece.ToString());
+            }
+        }
+    }
+}