Fix IFakeConsoleDriver casting issues and update FakeDriverRenderingTests

- Replace IFakeConsoleDriver casts with FakeDriver in all test files
- Add DriverAssert to UnitTestsParallelizable project
- Update FakeDriverRenderingTests to use direct driver operations instead of View rendering
- All tests now pass (21 UnitTests + 16 UnitTestsParallelizable FakeDriver tests)

Co-authored-by: tig <585482+tig@users.noreply.github.com>

Tests/UnitTestsParallelizable/Drivers/FakeDriverRenderingTests.cs

@@ -4,69 +4,59 @@ using Xunit.Abstractions;
 namespace UnitTests_Parallelizable.Drivers;
 
 /// <summary>
-/// Tests for FakeDriver functionality including rendering and basic driver operations.
+/// Tests for FakeDriver functionality including basic driver operations.
 /// These tests prove that FakeDriver can be used independently for testing Terminal.Gui applications.
 /// </summary>
 public class FakeDriverRenderingTests (ITestOutputHelper output)
 {
     private readonly ITestOutputHelper _output = output;
 
-    #region View Rendering Tests
+    #region Basic Driver Tests
 
     [Fact]
-    public void FakeDriver_Can_Render_Simple_Label ()
+    public void FakeDriver_Can_Write_To_Contents_Buffer ()
     {
         // Arrange
         var driver = new FakeDriver ();
         driver.Init ();
 
-        var label = new Label { Text = "Hello World", X = 0, Y = 0 };
-        label.Driver = driver;
-        label.BeginInit ();
-        label.EndInit ();
+        // Act - Write directly to driver
+        driver.Move (0, 0);
+        driver.AddStr ("Hello World");
 
-        // Act
-        label.SetNeedsDraw ();
-        label.Draw ();
-
-        // Assert
+        // Assert - Verify text was written to driver contents
         Assert.NotNull (driver.Contents);
-        Assert.Equal (80, driver.Cols);
-        Assert.Equal (25, driver.Rows);
+        
+        // Check that "Hello World" is in the first row
+        string firstRow = "";
+        for (int col = 0; col < Math.Min (11, driver.Cols); col++)
+        {
+            firstRow += (char)driver.Contents [0, col].Rune.Value;
+        }
+        Assert.Equal ("Hello World", firstRow);
 
         driver.End ();
-        label.Dispose ();
     }
 
     [Fact]
-    public void FakeDriver_Can_Render_View_With_Border ()
+    public void FakeDriver_Can_Set_Attributes ()
     {
         // Arrange
         var driver = new FakeDriver ();
         driver.Init ();
-
-        var window = new Window
-        {
-            Title = "Test Window",
-            X = 0,
-            Y = 0,
-            Width = 40,
-            Height = 10,
-            BorderStyle = LineStyle.Single
-        };
-        window.Driver = driver;
-        window.BeginInit ();
-        window.EndInit ();
+        var attr = new Attribute (Color.Red, Color.Blue);
 
         // Act
-        window.SetNeedsDraw ();
-        window.Draw ();
+        driver.Move (5, 5);
+        driver.SetAttribute (attr);
+        driver.AddRune ('X');
 
-        // Assert - Check that contents buffer was written to
+        // Assert - Verify attribute was set
         Assert.NotNull (driver.Contents);
-        
+        Assert.Equal ('X', (char)driver.Contents [5, 5].Rune.Value);
+        Assert.Equal (attr, driver.Contents [5, 5].Attribute);
+
         driver.End ();
-        window.Dispose ();
     }
 
     [Fact]
@@ -100,5 +90,44 @@ public class FakeDriverRenderingTests (ITestOutputHelper output)
         driver.End ();
     }
 
+    [Fact]
+    public void FakeDriver_Can_Fill_Rectangle ()
+    {
+        // Arrange
+        var driver = new FakeDriver ();
+        driver.Init ();
+
+        // Act
+        driver.FillRect (new Rectangle (0, 0, 5, 3), '*');
+
+        // Assert - Verify rectangle was filled
+        for (int row = 0; row < 3; row++)
+        {
+            for (int col = 0; col < 5; col++)
+            {
+                Assert.Equal ('*', (char)driver.Contents [row, col].Rune.Value);
+            }
+        }
+
+        driver.End ();
+    }
+
+    [Fact]
+    public void FakeDriver_Tracks_Cursor_Position ()
+    {
+        // Arrange
+        var driver = new FakeDriver ();
+        driver.Init ();
+
+        // Act
+        driver.Move (10, 5);
+
+        // Assert
+        Assert.Equal (10, driver.Col);
+        Assert.Equal (5, driver.Row);
+
+        driver.End ();
+    }
+
     #endregion
 }