fix(ValidClassName): Allow upper case with number

coder_sniffer/Drupal/Sniffs/NamingConventions/ValidClassNameSniff.php

@@ -74,9 +74,9 @@ public function process(File $phpcsFile, $stackPtr)
 
         // Ensure the name is not all uppercase.
         // @todo We could make this more strict to check if there are more than
-        // 2 upper case characters in a row, but not decided yet.
+        // 2 upper case characters in a row anywhere, but not decided yet.
         // See https://www.drupal.org/project/coder/issues/3497433
-        if (strtoupper($name) === $name) {
+        if (preg_match('|^[A-Z]{3}[^a-z]*$|', $name) === 1) {
             $error = '%s name must use UpperCamel naming and not contain multiple upper case letters in a row';
             $phpcsFile->addError($error, $stackPtr, 'NoUpperAcronyms', $errorData);
         }

tests/Drupal/NamingConventions/ValidEnumCaseUnitTest.inc

@@ -10,4 +10,19 @@ enum Test: int {
   // Upper case parts are allowed for now.
   case FourJSONCase = 4;
   case FiveAndAHorseCorrect = 5;
+  case UIExample = 6;
+}
+
+// Those are all ok.
+enum FiscalQuarter {
+  case Q1;
+  case Q2;
+  case Q3;
+  case Q4;
+}
+
+enum Plan {
+  case A;
+  case B;
+  case C;
 }