fix tests

src/Avalonia.Input/TouchDevice.cs

@@ -61,7 +61,7 @@ namespace Avalonia.Input
                     var settings = AvaloniaLocator.Current.GetService<ITouchPlatformSettings>();
                     if (settings == null)
                     {
-                        throw new Exception("IPlatformSettings can not be null.");
+                        throw new Exception("ITouchPlatformSettings can not be null.");
                     }
                     if (!_lastClickRect.Contains(args.Position)
                         || ev.Timestamp - _lastClickTime > settings.TouchDoubleClickTime.TotalMilliseconds)

tests/Avalonia.Input.UnitTests/TouchDeviceTests.cs

@@ -208,10 +208,10 @@ namespace Avalonia.Input.UnitTests
         {
             var unitTestApp = UnitTestApplication.Start(
                 new TestServices(inputManager: new InputManager()));
-            var iSettingsMock = new Mock<IPlatformSettings>();
-            iSettingsMock.Setup(x => x.DoubleClickTime).Returns(doubleClickTime);
+            var iSettingsMock = new Mock<ITouchPlatformSettings>();
+            iSettingsMock.Setup(x => x.TouchDoubleClickTime).Returns(doubleClickTime);
             AvaloniaLocator.CurrentMutable.BindToSelf(this)
-               .Bind<IPlatformSettings>().ToConstant(iSettingsMock.Object);
+               .Bind<ITouchPlatformSettings>().ToConstant(iSettingsMock.Object);
             return unitTestApp;
         }