Add SpinnerView

UnitTests/Views/SpinnerViewTests.cs

@@ -0,0 +1,71 @@
+using Terminal.Gui;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace UnitTests.Views {
+	public class SpinnerViewTests {
+
+		readonly ITestOutputHelper output;
+
+		public SpinnerViewTests (ITestOutputHelper output)
+		{
+			this.output = output;
+		}
+
+
+		[Fact,AutoInitShutdown]
+		public void TestSpinnerView_ThrottlesAnimation()
+		{
+			var view = GetSpinnerView ();
+
+			view.Redraw (view.Bounds);
+			
+			var expected = "/";
+			TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+
+			view.SetNeedsDisplay ();
+			view.Redraw (view.Bounds);
+
+			expected = "/";
+			TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+
+			view.SetNeedsDisplay ();
+			view.Redraw (view.Bounds);
+
+			expected = "/";
+			TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+		}
+		[Fact, AutoInitShutdown]
+		public void TestSpinnerView_NoThrottle()
+		{
+			var view = GetSpinnerView ();
+			view.SpinDelayInMilliseconds = 0;
+
+			view.Redraw (view.Bounds);
+
+
+			var expected = @"─";
+			TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+
+			view.SetNeedsDisplay ();
+			view.Redraw (view.Bounds);
+
+
+			expected = @"\";
+			TestHelpers.AssertDriverContentsWithFrameAre (expected, output);
+		}
+
+		private SpinnerView GetSpinnerView ()
+		{
+			var view = new SpinnerView (); 
+			
+			Application.Top.Add (view);
+			Application.Begin (Application.Top);
+
+			Assert.Equal (1, view.Width);
+			Assert.Equal (1, view.Height);
+
+			return view;
+		}
+	}
+}