add test for yyyy short date pattern

Author: matouskozak

src/libraries/System.Runtime/tests/System.Globalization.Tests/DateTimeFormatInfo/DateTimeFormatInfoShortDatePattern.cs

@@ -232,6 +232,21 @@ public void ShortDatePattern_Set_GetReturnsExpected(string value)
             Assert.Equal(value, format.ShortDatePattern);
         }
 
+        public static IEnumerable<object[]> ShortDatePatter_Set_Culture_TestData()
+        {
+            yield return new object[] { "de-DE", "dd.MM.yyyy" };
+            yield return new object[] { "en-US", "M/d/yyyy" };
+            yield return new object[] { "fa-IR", "yyyy/M/d" };
+        }
+
+        [Theory]
+        [MemberData(nameof(ShortDatePatter_Set_Culture_TestData))]
+        public void ShortDatePattern_SetCulture_GetReturnsExpected(string cultureName, string expected)
+        {
+            var format = new CultureInfo(cultureName).DateTimeFormat;
+            Assert.True(expected == format.ShortDatePattern, $"Failed for culture: {cultureName}. Expected: {expected}, Actual: {format.ShortDatePattern}");
+        }
+
         [Fact]
         public void ShortDatePattern_Set_InvalidatesDerivedPatterns()
         {