From 2aaac393b75774495bfc6638999513c5587ac4bf Mon Sep 17 00:00:00 2001
From: Felix Detig <fdetig@googlemail.com>
Date: Fri, 11 Feb 2022 23:10:39 +0100
Subject: [PATCH] =?UTF-8?q?TicTacToeBrett.Set=20auf=20ein=20belegtes=20Fel?=
 =?UTF-8?q?d=20l=C3=A4sst=20das=20Feld=20unver=C3=A4ndert=20und=20gibt=20f?=
 =?UTF-8?q?alse=20zur=C3=BCck?=
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---
 .../MiniGames/Shared/Models/TicTacToeBrett.cs  |  8 +++++++-
 .../MiniGamesTests/TicTacToeBrettTest.cs       | 18 ++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
index 329bb08..460e7f2 100644
--- a/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
+++ b/BlazorSolution/MiniGames/Shared/Models/TicTacToeBrett.cs
@@ -43,7 +43,13 @@ namespace MiniGames.Shared.Models
 
         public bool Set(int pos, int wert)
         {
-            Felder[pos / 3, pos % 3] = wert;
+            int x = pos / 3;
+            int y = pos % 3;
+
+            if (Felder[x, y] != -1)
+                return false;
+
+            Felder[x, y] = wert;
 
             return true;
         }
diff --git a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
index 53a56f8..ac787a9 100644
--- a/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
+++ b/BlazorSolution/MiniGamesTests/TicTacToeBrettTest.cs
@@ -44,6 +44,24 @@ namespace MiniGamesTests
             Assert.True(brett.Gleich(erwartetesBrett));
         }
 
+        [Fact]
+        public void Set_BelegtesFeldBelegenTest()
+        {
+            // arrange
+            TicTacToeBrett brett = TestBrett(1);
+            TicTacToeBrett erwartetesBrett = TestBrett(1);
+            int pos = 0;
+            int wert = 1;
+            bool erwartetGesetzt = false;
+
+            // act
+            bool erhaltenGesetzt = brett.Set(pos, wert);
+
+            // assert
+            Assert.Equal(erwartetGesetzt, erhaltenGesetzt);
+            Assert.True(brett.Gleich(erwartetesBrett));
+        }
+
         [Fact]
         public void Gleich_LeereBretterGleichTest()
         {