Added more unit tests

Author: Sergio0694

UnitTests/UnitTests.UWP/UI/Controls/Test_ConstrainedBox.AspectRatio.cs

@@ -93,7 +93,43 @@ await App.DispatcherQueue.EnqueueAsync(async () =>
 
         [TestCategory("ConstrainedBox")]
         [TestMethod]
-        public void Test_ConstrainedBox_AspectRatioParsing()
+        public void Test_ConstrainedBox_AspectRatioParsing_WidthAndHeight()
+        {
+            CultureInfo currentCulture = CultureInfo.CurrentCulture;
+
+            try
+            {
+                CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;
+
+                AspectRatio ratio = AspectRatio.ConvertToAspectRatio("1.666:1.2");
+
+                Assert.AreEqual(ratio.Width, 1.666);
+                Assert.AreEqual(ratio.Height, 1.2);
+
+                // Explicit tests for other culture infos, see https://github.com/CommunityToolkit/WindowsCommunityToolkit/issues/4252
+                CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("it-IT");
+
+                ratio = AspectRatio.ConvertToAspectRatio("1.666:1.2");
+
+                Assert.AreEqual(ratio.Width, 1.666);
+                Assert.AreEqual(ratio.Height, 1.2);
+
+                CultureInfo.CurrentCulture = CultureInfo.GetCultureInfo("fr-FR");
+
+                ratio = AspectRatio.ConvertToAspectRatio("1.666:1.2");
+
+                Assert.AreEqual(ratio.Width, 1.666);
+                Assert.AreEqual(ratio.Height, 1.2);
+            }
+            finally
+            {
+                CultureInfo.CurrentCulture = currentCulture;
+            }
+        }
+
+        [TestCategory("ConstrainedBox")]
+        [TestMethod]
+        public void Test_ConstrainedBox_AspectRatioParsing_Ratio()
         {
             CultureInfo currentCulture = CultureInfo.CurrentCulture;