Fix incorrect region two-letter code

CHANGELIST.md

@@ -63,6 +63,7 @@
 - Fix non-tag tag shortnames
 - Fix parsing of non-tag tags again
 - Disable unnecessary cuesheet parsing
+- Fix incorrect region two-letter code
 
 ### 2.2 (2021-12-30)
 - Fix Saturn header finding

MPF.Test/RedumpLib/ExtensionsTests.cs

@@ -255,7 +255,7 @@ namespace MPF.Test.RedumpLib
         /// Ensure that every Language that has an ISO 639-1 code is unique
         /// </summary>
         [Fact]
-        public void NoDuplicateTwoLetterCodeTest()
+        public void LanguageNoDuplicateTwoLetterCodeTest()
         {
             var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
             var filteredLanguages = new Dictionary<string, Language?>();
@@ -282,7 +282,7 @@ namespace MPF.Test.RedumpLib
         /// Ensure that every Language that has a standard/bibliographic ISO 639-2 code is unique
         /// </summary>
         [Fact]
-        public void NoDuplicateThreeLetterCodeTest()
+        public void LanguageNoDuplicateThreeLetterCodeTest()
         {
             var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
             var filteredLanguages = new Dictionary<string, Language?>();
@@ -309,7 +309,7 @@ namespace MPF.Test.RedumpLib
         /// Ensure that every Language that has a terminology ISO 639-2 code is unique
         /// </summary>
         [Fact]
-        public void NoDuplicateThreeLetterCodeAltTest()
+        public void LanguageNoDuplicateThreeLetterCodeAltTest()
         {
             var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
             var filteredLanguages = new Dictionary<string, Language?>();
@@ -474,6 +474,33 @@ namespace MPF.Test.RedumpLib
                 Assert.NotNull(actual);
         }
 
+        /// <summary>
+        /// Ensure that every Language that has an ISO 639-1 code is unique
+        /// </summary>
+        [Fact]
+        public void RegionNoDuplicateShortNameTest()
+        {
+            var fullRegions = Enum.GetValues(typeof(Region)).Cast<Region?>().ToList();
+            var filteredRegions = new Dictionary<string, Region?>();
+
+            int totalCount = 0;
+            foreach (Region? region in fullRegions)
+            {
+                string code = region.ShortName();
+                if (string.IsNullOrWhiteSpace(code))
+                    continue;
+
+                // Throw if the code already exists
+                if (filteredRegions.ContainsKey(code))
+                    throw new DuplicateNameException($"Code {code} already in dictionary");
+
+                filteredRegions[code] = region;
+                totalCount++;
+            }
+
+            Assert.Equal(totalCount, filteredRegions.Count);
+        }
+
         /// <summary>
         /// Generate a test set of Region values
         /// </summary>

RedumpLib/Data/Enumerations.cs

@@ -2416,7 +2416,7 @@ namespace RedumpLib.Data
         [HumanReadable(LongName = "Afghanistan", ShortName = "Af")]
         Afghanistan,
 
-        [HumanReadable(LongName = "Åland Islands", ShortName = "Af")]
+        [HumanReadable(LongName = "Åland Islands", ShortName = "Ax")]
         AlandIslands,
 
         [HumanReadable(LongName = "Albania", ShortName = "Al")]