Added Test case for Sri Lanka Regions

Author: poorna-soysa

test/CountryData.UnitTests/CountryHelperTests.cs

@@ -127,4 +127,26 @@ public void GetCountriesByPhoneCode_WithCorrectPhoneCode_ShouldReturnCountries(s
         countries.Should().NotBeNullOrEmpty();
         countries.Any(c => c.CountryShortCode == expectedShortCode).Should().BeTrue();
     }
+
+
+    /// <summary>
+    ///  Tests the GetRegionByCountryCode method in the CountryHelper class.
+    ///  This test verifies if the method correctly returns the regions associated with a given country's short code.
+    /// </summary>
+    /// <param name="shortCode">The short code of the country for which the regions are to be retrieved.</param>
+
+    [Theory]
+    [InlineData("LK")]
+    public void GetRegions_WithCorrectCode_ShouldReturnCountryRegions(string shortCode)
+    {
+        //Act
+        var regions = _countryHelper.GetRegionByCountryCode(shortCode);
+
+        //Assert
+        regions.Should().NotBeNull();
+        if (shortCode == "LK")
+        {
+            regions.Should().HaveCount(9);
+        }
+    }
 }