diff --git a/source/Trek-12/Tests/RulesTests.cs b/source/Trek-12/Tests/RulesTests.cs
new file mode 100644
index 0000000..2994420
--- /dev/null
+++ b/source/Trek-12/Tests/RulesTests.cs
@@ -0,0 +1,39 @@
+namespace Tests;
+using Models.Game;
+using Models.Rules;
+
+public class RulesTests
+{
+    [Fact]
+    public void IsCellEmpty_ReturnsTrue_WhenCellIsNull()
+    {
+        Rules rules = new Rules();
+        Assert.True(rules.IsCellEmpty(null));
+    }
+    
+    [Fact]
+    public void IsCellEmpty_ReturnsTrue_WhenCellValueIsNull()
+    {
+        Rules rules = new Rules();
+        Cell cell = new Cell(0, 0);
+        Assert.True(rules.IsCellEmpty(cell));
+    }
+    
+    [Fact]
+    public void IsCellEmpty_ReturnsFalse_WhenCellValueIsNotNull()
+    {
+        Rules rules = new Rules();
+        Cell cell = new Cell(0, 0);
+        cell.Value = 1;
+        Assert.False(rules.IsCellEmpty(cell));
+    }
+    
+    [Fact]
+    public void IsCellValid_ReturnsTrue_WhenCellIsEmptyAndHasAdjacentCells()
+    {
+        Rules rules = new Rules();
+        Map map = new Map("background");
+        Cell selectedCell = map.Boards[0];
+        Assert.True(rules.IsCellValid(selectedCell, map.Boards));
+    }
+}
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