set country code as a collection of string, fix failing tests

src/World.Net.UnitTests/Countries/AlandIslandsTest.cs

@@ -9,7 +9,7 @@ public sealed class AlandIslandsTest
     private const int ALAND_ISLANDS_NUMERIC_CODE = 248;
     private const string ALAND_ISLANDS_ISO2_CODE = "AX";
     private const string ALAND_ISLANDS_ISO3_CODE = "ALA";
-    private const string ALAND_ISLANDS_CALLING_CODE = "+358";
+    private readonly string[] ALAND_ISLANDS_CALLING_CODE = ["+358"];
 
     [Fact]
     public void GetCountry_ReturnsCorrectInformation_ForAlandIslands()

src/World.Net.UnitTests/Countries/AlbaniaTests.cs

@@ -10,7 +10,7 @@ public sealed class AlbaniaTests
     private const int ALBANIA_NUMERIC_CODE = 008;
     private const string ALBANIA_ISO2_CODE = "AL";
     private const string ALBANIA_ISO3_CODE = "ALB";
-    private const string ALBANIA_CALLING_CODE = "+355";
+    private readonly string[] ALBANIA_CALLING_CODE = ["+355"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/AlgeriaTest.cs

@@ -9,7 +9,7 @@ public sealed class AlgeriaTest
     private const int ALGERIA_NUMERIC_CODE = 012;
     private const string ALGERIA_ISO2_CODE = "DZ";
     private const string ALGERIA_ISO3_CODE = "DZA";
-    private const string ALGERIA_CALLING_CODE = "+213";
+    private readonly string[] ALGERIA_CALLING_CODE = ["+213"];
     private const int ALGERIA_PROVINCE_COUNT = 57;
     private const string ALGERIA_STATE_TYPE = "Province";
 

src/World.Net.UnitTests/Countries/AmericanSamoaTest.cs

@@ -9,7 +9,7 @@ public sealed class AmericanSamoaTest
     private const int AmericanSamoa_NUMERIC_CODE = 016;
     private const string AmericanSamoa_ISO2_CODE = "AS";
     private const string AmericanSamoa_ISO3_CODE = "ASM";
-    private const string AmericanSamoa_CALLING_CODE = "+1";
+    private readonly string[] AmericanSamoa_CALLING_CODE = ["+1"];
     private const int AmericanSamoa_STATE_COUNT = 0;
 
     [Fact]

src/World.Net.UnitTests/Countries/AndorraTest.cs

@@ -9,7 +9,7 @@ public sealed class AndorraTest
     private const int ANDORRA_NUMERIC_CODE = 020;
     private const string ANDORRA_ISO2_CODE = "AD";
     private const string ANDORRA_ISO3_CODE = "AND";
-    private const string ANDORRA_CALLING_CODE = "+376";
+    private readonly string[] ANDORRA_CALLING_CODE = ["+376"];
     private const int ANDORRA_PARISH_COUNT = 7;
     private const string ANDORRA_STATE_TYPE = "Parish";
 

src/World.Net.UnitTests/Countries/AngolaTest.cs

@@ -9,7 +9,7 @@ public sealed class AngolaTest
     private const string ANGOLA_ISO2_CODE = "AO";
     private const string ANGOLA_ISO3_CODE = "AGO";
     private const int ANGOLA_NUMERIC_CODE = 024;
-    private const string ANGOLA_CALLING_CODE = "+244";
+    private readonly string[] ANGOLA_CALLING_CODE = ["+244"];
     private const string ANGOLA_STATE_TYPE = "Province";
 
 

src/World.Net.UnitTests/Countries/AnguillaTest.cs

@@ -9,7 +9,7 @@ public sealed class AnguillaTest
     private const string ANGUILLA_ISO2_CODE = "AI";
     private const string ANGUILLA_ISO3_CODE = "AIA";
     private const int ANGUILLA_NUMERIC_CODE = 660;
-    private const string ANGUILLA_CALLING_CODE = "+1-264";
+    private readonly string[] ANGUILLA_CALLING_CODE = ["+1-264"];
     private const int ANGUILLA_DISTRICT_COUNT = 14;
     private const string ANGUILLA_STATE_TYPE = "District";
 

src/World.Net.UnitTests/Countries/AntarticaTest.cs

@@ -9,7 +9,7 @@ public class AntarticaTest
     private const string ANTARCTICA_ISO2_CODE = "AQ";
     private const string ANTARCTICA_ISO3_CODE = "ATA";
     private const int ANTARCTICA_NUMERIC_CODE = 10;
-    private const string ANTARCTICA_CALLING_CODE = "+672";
+    private readonly string[] ANTARCTICA_CALLING_CODE = ["+672"];
 
     [Fact]
     public void GetCountry_ReturnsCorrectInformation_ForAntarctica()

src/World.Net.UnitTests/Countries/AntiguaAndBarbudaTest.cs

@@ -10,7 +10,7 @@ public sealed class AntiguaAndBarbudaTest
     private const int ANTIGUA_AND_BERBUDA_NUMERIC_CODE = 028;
     private const string ANTIGUA_AND_BERBUDA_ISO2_CODE = "AG";
     private const string ANTIGUA_AND_BERBUDA_ISO3_CODE = "ATG";
-    private const string ANTIGUA_AND_BERBUDA_CALLING_CODE = "+1";
+    private readonly string[] ANTIGUA_AND_BERBUDA_CALLING_CODE = ["+1"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/ArgentinaTest.cs

@@ -10,7 +10,7 @@ public sealed class ArgentinaTest
     private const int ARGENTINA_NUMERIC_CODE = 032;
     private const string ARGENTINA_ISO2_CODE = "AR";
     private const string ARGENTINA_ISO3_CODE = "ARG";
-    private const string ARGENTINA_CALLING_CODE = "+54";
+    private readonly string[] ARGENTINA_CALLING_CODE = ["+54"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/ArmeniaTest.cs

@@ -10,7 +10,7 @@ public sealed class ArmeniaTest
     private const int ARMENIA_NUMERIC_CODE = 051;
     private const string ARMENIA_ISO2_CODE = "AM";
     private const string ARMENIA_ISO3_CODE = "ARM";
-    private const string ARMENIA_CALLING_CODE = "+374";
+    private readonly string[] ARMENIA_CALLING_CODE = ["+374"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/ArubaTest.cs

@@ -10,7 +10,7 @@ public sealed class ArubaTest
     private const int ARUBA_NUMERIC_CODE = 533;
     private const string ARUBA_ISO2_CODE = "AW";
     private const string ARUBA_ISO3_CODE = "ABW";
-    private const string ARUBA_CALLING_CODE = "+297";
+    private readonly string[] ARUBA_CALLING_CODE = ["+297"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/AustraliaTest.cs

@@ -10,7 +10,7 @@ public sealed class AustraliaTest
     private const int AUSTRALIA_NUMERIC_CODE = 036;
     private const string AUSTRALIA_ISO2_CODE = "AU";
     private const string AUSTRALIA_ISO3_CODE = "AUS";
-    private const string AUSTRALIA_CALLING_CODE = "+61";
+    private readonly string[] AUSTRALIA_CALLING_CODE = ["+61"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/AustriaTest.cs

@@ -10,7 +10,7 @@ public sealed class AustriaTest
     private const int AUSTRIA_NUMERIC_CODE = 040;
     private const string AUSTRIA_ISO2_CODE = "AT";
     private const string AUSTRIA_ISO3_CODE = "AUT";
-    private const string AUSTRIA_CALLING_CODE = "+43";
+    private readonly string[] AUSTRIA_CALLING_CODE = ["+43"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/AzerbaijanTest.cs

@@ -9,7 +9,7 @@ public sealed class AzerbaijanTest
     private const string AZERBAIJAN_ISO2_CODE = "AZ";
     private const string AZERBAIJAN_ISO3_CODE = "AZE";
     private const int AZERBAIJAN_NUMERIC_CODE = 031;
-    private const string AZERBAIJAN_CALLING_CODE = "+994";
+    private readonly string[] AZERBAIJAN_CALLING_CODE = ["+994"];
     private const int AZERBAIJAN_STATE_COUNT = 75;
     private static readonly string[] VALID_STATE_TYPES = { "District", "Municipality", "Autonomous Republic", };
 

src/World.Net.UnitTests/Countries/BahrainTest.cs

@@ -9,7 +9,7 @@ public sealed class BahrainTest
     private const string BAHRAIN_ISO2_CODE = "BH";
     private const string BAHRAIN_ISO3_CODE = "BHR";
     private const int BAHRAIN_NUMERIC_CODE = 048;
-    private const string BAHRAIN_CALLING_CODE = "+973";
+    private readonly string[] BAHRAIN_CALLING_CODE = ["+973"];
     private const int BAHRAIN_STATE_COUNT = 5;
     private static readonly string[] VALID_STATE_TYPES = { "Governorate", };
 

src/World.Net.UnitTests/Countries/BangladeshTest.cs

@@ -9,7 +9,7 @@ public sealed class BangladeshTest
     private const int BANGLADESH_NUMERIC_CODE = 050;
     private const string BANGLADESH_ISO2_CODE = "BD";
     private const string BANGLADESH_ISO3_CODE = "BGD";
-    private const string BANGLADESH_CALLING_CODE = "+880";
+    private readonly string[] BANGLADESH_CALLING_CODE = ["+880"];
     private const int BANGLADESH_DIVISION_COUNT = 8;
     private const string BANGLADESH_STATE_TYPE = "Division";
 

src/World.Net.UnitTests/Countries/BarbadosTest.cs

@@ -9,7 +9,7 @@ public sealed class BarbadosTest
     private const int BARBADOS_NUMERIC_CODE = 052;
     private const string BARBADOS_ISO2_CODE = "BB";
     private const string BARBADOS_ISO3_CODE = "BRB";
-    private const string BARBADOS_CALLING_CODE = "+1-246";
+    private readonly string[] BARBADOS_CALLING_CODE = ["+1-246"];
     private const int BARBADOS_PARISH_COUNT = 11;
     private const string BARBADOS_STATE_TYPE = "Parish";
 

src/World.Net.UnitTests/Countries/BelarusTest.cs

@@ -9,7 +9,7 @@ public sealed class BelarusTest
     private const int BELARUS_NUMERIC_CODE = 112;
     private const string BELARUS_ISO2_CODE = "BY";
     private const string BELARUS_ISO3_CODE = "BLR";
-    private const string BELARUS_CALLING_CODE = "+375";
+    private readonly string[] BELARUS_CALLING_CODE = ["+375"];
     private const int BELARUS_PARISH_COUNT = 7;
 
     [Fact]

src/World.Net.UnitTests/Countries/BelgiumTest.cs

@@ -9,7 +9,7 @@ public sealed class BelgiumTest
     private const int BELGIUM_NUMERIC_CODE = 056;
     private const string BELGIUM_ISO2_CODE = "BE";
     private const string BELGIUM_ISO3_CODE = "BEL";
-    private const string BELGIUM_CALLING_CODE = "+32";
+    private readonly string[] BELGIUM_CALLING_CODE = ["+32"];
     private const int BELGIUM_REGION_COUNT = 3;
     private const int BELGIUM_PROVINCE_COUNT = 10;
     private const string BELGIUM_REGION_TYPE = "Region";

src/World.Net.UnitTests/Countries/BelizeTest.cs

@@ -9,7 +9,7 @@ public sealed class BelizeTest
     private const int BELIZE_NUMERIC_CODE = 084;
     private const string BELIZE_ISO2_CODE = "BZ";
     private const string BELIZE_ISO3_CODE = "BLZ";
-    private const string BELIZE_CALLING_CODE = "+501";
+    private readonly string[] BELIZE_CALLING_CODE = ["+501"];
     private const int BELIZE_DISTRICT_COUNT = 6;
     private const string BELIZE_STATE_TYPE = "District";
 

src/World.Net.UnitTests/Countries/BeninTest.cs

@@ -9,7 +9,7 @@ public sealed class BeninTest
     private const int BENIN_NUMERIC_CODE = 204;
     private const string BENIN_ISO2_CODE = "BJ";
     private const string BENIN_ISO3_CODE = "BEN";
-    private const string BENIN_CALLING_CODE = "+229";
+    private readonly string[] BENIN_CALLING_CODE = ["+229"];
     private const int BENIN_DEPARTMENT_COUNT = 12;
     private const string BENIN_STATE_TYPE = "Department";
 

src/World.Net.UnitTests/Countries/BermudaTest.cs

@@ -1,6 +1,6 @@
 namespace World.Net.UnitTests.Countries;
 
-internal static class BermudaTestData
+public class BermudaTestData
 {
     internal const string COUNTRY_NAME = "Bermuda";
     internal const string NATIVE_NAME = "Bermuda";
@@ -9,7 +9,7 @@ internal static class BermudaTestData
     internal const string ISO2_CODE = "BM";
     internal const string ISO3_CODE = "BMU";
     internal const int NUMERIC_CODE = 60;
-    internal const string CALLING_CODE = "+1-441";
+    internal static readonly string[] CALLING_CODE = ["+1-441"];
     internal const string STATE_TYPE = "Municipality";
     internal const int EXPECTED_STATE_COUNT = 9;
 }

src/World.Net.UnitTests/Countries/BhutanTest.cs

@@ -9,7 +9,7 @@ internal static class BhutanTestData
     internal const string ISO2_CODE = "BT";
     internal const string ISO3_CODE = "BTN";
     internal const int NUMERIC_CODE = 64;
-    internal const string CALLING_CODE = "+975";
+    internal static readonly string[] CALLING_CODE = ["+975"];
     internal const string STATE_TYPE = "District";
     internal const int EXPECTED_STATE_COUNT = 20;
 }

src/World.Net.UnitTests/Countries/BoliviaTests.cs

@@ -9,7 +9,7 @@ internal static class BoliviaTestData
     internal const string ISO2_CODE = "BO";
     internal const string ISO3_CODE = "BOL";
     internal const int NUMERIC_CODE = 68;
-    internal const string CALLING_CODE = "+591";
+    internal static readonly string[] CALLING_CODE = ["+591"];
     internal const string STATE_TYPE = "Department";
     internal const int EXPECTED_STATE_COUNT = 9;
 }

src/World.Net.UnitTests/Countries/BosniaAndHerzegovinaTest.cs

@@ -10,7 +10,7 @@ public sealed class BosniaAndHerzegovinaTest
     private const int BOSNIA_AND_HERZEGOVINA_NUMERIC_CODE = 070;
     private const string BOSNIA_AND_HERZEGOVINA_ISO2_CODE = "BA";
     private const string BOSNIA_AND_HERZEGOVINA_ISO3_CODE = "BIH";
-    private const string BOSNIA_AND_HERZEGOVINA_CALLING_CODE = "+387";
+    private static readonly string[] BOSNIA_AND_HERZEGOVINA_CALLING_CODE = ["+387"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/BotswanaTest.cs

@@ -10,7 +10,7 @@ public sealed class BotswanaTest
     private const int BOTSWANA_NUMERIC_CODE = 072;
     private const string BOTSWANA_ISO2_CODE = "BW";
     private const string BOTSWANA_ISO3_CODE = "BWA";
-    private const string BOTSWANA_CALLING_CODE = "+267";
+    private readonly string[] BOTSWANA_CALLING_CODE = ["+267"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/BouvetIslandTest.cs

@@ -9,7 +9,7 @@ public sealed class BouvetIslandTest
     private const int BOUVETISLAND_NUMERIC_CODE = 074;
     private const string BOUVETISLAND_ISO2_CODE = "BV";
     private const string BOUVETISLAND_ISO3_CODE = "BVT";
-    private const string BOUVETISLAND_CALLING_CODE = "+0055";
+    private readonly string[] BOUVETISLAND_CALLING_CODE = ["+0055"];
 
 
     [Fact]

src/World.Net.UnitTests/Countries/BrazilTest.cs

@@ -10,7 +10,7 @@ public sealed class BrazilTest
         private const int BRAZIL_NUMERIC_CODE = 076;
         private const string BRAZIL_ISO2_CODE = "BR";
         private const string BRAZIL_ISO3_CODE = "BRA";
-        private const string BRAZIL_CALLING_CODE = "+55";
+        private readonly string[] BRAZIL_CALLING_CODE = ["+55"];
 
         [Fact]
         public void GetCountry_ReturnsCorrectInformation_for_Brazil()

src/World.Net.UnitTests/Countries/BritishIndianOceanTerritoryTest.cs

@@ -9,7 +9,7 @@ public sealed class BritishIndianOceanTerritoryTest
         private const int BRITISH_INDIAN_OCEAN_TERRITORY_NUMERIC_CODE = 086;
         private const string BRITISH_INDIAN_OCEAN_TERRITORY_ISO2_CODE = "IO";
         private const string BRITISH_INDIAN_OCEAN_TERRITORY_ISO3_CODE = "IOT";
-        private const string BRITISH_INDIAN_OCEAN_TERRITORY_CALLING_CODE = "+246";
+        private readonly string[] BRITISH_INDIAN_OCEAN_TERRITORY_CALLING_CODE = ["+246"];
 
         [Fact]
         public void GetCountry_ReturnsCorrectInformation_for_BritishIndianOceanTerritory()

src/World.Net.UnitTests/Countries/BruneiTest.cs

@@ -10,7 +10,7 @@ public sealed class BruneiTest
         private const int BRUNEI_NUMERIC_CODE = 096;
         private const string BRUNEI_ISO2_CODE = "BN";
         private const string BRUNEI_ISO3_CODE = "BRN";
-        private const string BRUNEI_CALLING_CODE = "+673";
+        private readonly string[] BRUNEI_CALLING_CODE = ["+673"];
 
         [Fact]
         public void GetCountry_ReturnsCorrectInformation_for_Brunei()

src/World.Net.UnitTests/Countries/BulgariaTest.cs

@@ -10,7 +10,7 @@ public sealed class BulgariaTest
         private const int BULGARIA_NUMERIC_CODE = 100;
         private const string BULGARIA_ISO2_CODE = "BG";
         private const string BULGARIA_ISO3_CODE = "BGR";
-        private const string BULGARIA_CALLING_CODE = "+359";
+        private readonly string[] BULGARIA_CALLING_CODE = ["+359"];
 
         [Fact]
         public void GetCountry_ReturnsCorrectInformation_for_Bulgaria()

src/World.Net.UnitTests/Countries/BurkinaFasoTest.cs

@@ -10,7 +10,7 @@ public sealed class BurkinaFasoTest
         private const int BURKINA_FASO_NUMERIC_CODE = 854;
         private const string BURKINA_FASO_ISO2_CODE = "BF";
         private const string BURKINA_FASO_ISO3_CODE = "BFA";
-        private const string BURKINA_FASO_CALLING_CODE = "+226";
+        private readonly string[] BURKINA_FASO_CALLING_CODE = ["+226"];
 
         [Fact]
         public void GetCountry_ReturnsCorrectInformation_for_BurkinaFaso()

src/World.Net.UnitTests/Countries/BurundiTest.cs

@@ -9,7 +9,7 @@ public sealed class BurundiTest
     private const string BURUNDI_ISO2_CODE = "BI";
     private const string BURUNDI_ISO3_CODE = "BDI";
     private const int BURUNDI_NUMERIC_CODE = 108;
-    private const string BURUNDI_CALLING_CODE = "+257";
+    private readonly string[] BURUNDI_CALLING_CODE = ["+257"];
     private const int BURUNDI_STATE_COUNT = 18;
     private static readonly string[] VALID_STATE_TYPES = { "Province" };
 

src/World.Net.UnitTests/Countries/CambodiaTest.cs

@@ -9,7 +9,7 @@ public sealed class CambodiaTest
     private const string CAMBODIA_ISO2_CODE = "KH";
     private const string CAMBODIA_ISO3_CODE = "KHM";
     private const int CAMBODIA_NUMERIC_CODE = 116;
-    private const string CAMBODIA_CALLING_CODE = "+855";
+    private readonly string[] CAMBODIA_CALLING_CODE = ["+855"];
     private const int CAMBODIA_STATE_COUNT = 25;
     private static readonly string[] VALID_STATE_TYPES = { "Province", "Municipality" };
 

src/World.Net.UnitTests/Countries/CameroonTest.cs

@@ -9,7 +9,7 @@ public sealed class CameroonTest
     private const string CAMEROON_ISO2_CODE = "CM";
     private const string CAMEROON_ISO3_CODE = "CMR";
     private const int CAMEROON_NUMERIC_CODE = 120;
-    private const string CAMEROON_CALLING_CODE = "+237";
+    private readonly string[] CAMEROON_CALLING_CODE = ["+237"];
     private const int CAMEROON_STATE_COUNT = 10;
     private static readonly string[] VALID_STATE_TYPES = { "Region" };
 

src/World.Net.UnitTests/Countries/CanadaTest.cs

@@ -9,7 +9,7 @@ public sealed class CanadaTest
     private const string CANADA_ISO2_CODE = "CA";
     private const string CANADA_ISO3_CODE = "CAN";
     private const int CANADA_NUMERIC_CODE = 124;
-    private const string CANADA_CALLING_CODE = "+1";
+    private readonly string[] CANADA_CALLING_CODE = ["+1"];
     private const int CANADA_STATE_COUNT = 13;
     private static readonly string[] VALID_STATE_TYPES = { "Province", "Territory" };
 

src/World.Net.UnitTests/Countries/CapeVerdeTest.cs

@@ -9,7 +9,7 @@ public sealed class CapeVerdeTest
     private const string CAPEVERDE_ISO2_CODE = "CV";
     private const string CAPEVERDE_ISO3_CODE = "CPV";
     private const int CAPEVERDE_NUMERIC_CODE = 132;
-    private const string CAPEVERDE_CALLING_CODE = "+238";
+    private readonly string[] CAPEVERDE_CALLING_CODE = ["+238"];
     private const int CAPEVERDE_STATE_COUNT = 22;
     private static readonly string[] VALID_STATE_TYPES = { "Municipality" };
 

src/World.Net.UnitTests/Countries/CaymanIslandsTest.cs

@@ -9,7 +9,7 @@ public sealed class CaymanIslandsTest
         private const string CAYMAN_ISLANDS_ISO2_CODE = "KY";
         private const string CAYMAN_ISLANDS_ISO3_CODE = "CYM";
         private const int CAYMAN_ISLANDS_NUMERIC_CODE = 136;
-        private const string CAYMAN_ISLANDS_CALLING_CODE = "+1-345";
+        private readonly string[] CAYMAN_ISLANDS_CALLING_CODE = ["+1-345"];
         private const int CAYMAN_ISLANDS_STATE_COUNT = 3;
         private static readonly string[] VALID_STATE_TYPES = { "District" };
 

src/World.Net.UnitTests/Countries/CentralAfricanRepublicTest.cs

@@ -9,7 +9,7 @@ public sealed class CentralAfricanRepublicTest
     private const string CAR_ISO2_CODE = "CF";
     private const string CAR_ISO3_CODE = "CAF";
     private const int CAR_NUMERIC_CODE = 140;
-    private const string CAR_CALLING_CODE = "+236";
+    private readonly string[] CAR_CALLING_CODE = ["+236"];
     private const int CAR_STATE_COUNT = 14;
     private static readonly string[] VALID_STATE_TYPES = { "Prefecture", "Capital District" };
 

src/World.Net.UnitTests/Countries/ChadTest.cs

@@ -9,7 +9,7 @@ public sealed class ChadTest
     private const string CHAD_ISO2_CODE = "TD";
     private const string CHAD_ISO3_CODE = "TCD";
     private const int CHAD_NUMERIC_CODE = 148;
-    private const string CHAD_CALLING_CODE = "+235";
+    private readonly string[] CHAD_CALLING_CODE = ["+235"];
     private const int CHAD_STATE_COUNT = 23;
     private static readonly string[] VALID_STATE_TYPES = { "Region" };
 

src/World.Net.UnitTests/Countries/ChileTest.cs

@@ -9,7 +9,7 @@ public sealed class ChileTest
     private const string CHILE_ISO2_CODE = "CL";
     private const string CHILE_ISO3_CODE = "CHL";
     private const int CHILE_NUMERIC_CODE = 152;
-    private const string CHILE_CALLING_CODE = "+56";
+    private readonly string[] CHILE_CALLING_CODE = ["+56"];
     private const int CHILE_STATE_COUNT = 16;
     private static readonly string[] VALID_STATE_TYPES = { "Region" };
 

src/World.Net.UnitTests/Countries/ChinaTest.cs

@@ -9,7 +9,7 @@ public sealed class ChinaTest
     private const string CHINA_ISO2_CODE = "CN";
     private const string CHINA_ISO3_CODE = "CHN";
     private const int CHINA_NUMERIC_CODE = 156;
-    private const string CHINA_CALLING_CODE = "+86";
+    private readonly string[] CHINA_CALLING_CODE = ["+86"];
     private const int CHINA_STATE_COUNT = 34; // 23 Provinces, 4 Municipalities, 5 Autonomous Regions, 2 SAR
     private static readonly string[] VALID_STATE_TYPES = { "Province", "Municipality", "Autonomous Region", "Special Administrative Region" };