Ruleset: update an error message

Author: jrfnl

src/Ruleset.php

@@ -1460,7 +1460,7 @@ public function populateTokenListeners()
 
             $tokens = $this->sniffs[$sniffClass]->register();
             if (is_array($tokens) === false) {
-                $msg = "The sniff $sniffClass register() method must return an array.";
+                $msg = "The sniff {$sniffClass}::register() method must return an array.";
                 $this->msgCache->add($msg, MsgCollector::ERROR);
 
                 // Unregister the sniff.

tests/Core/Ruleset/PopulateTokenListenersTest.php

@@ -62,7 +62,7 @@ public function testSniffWhereRegisterDoesNotReturnAnArrayThrowsException()
         $config   = new ConfigDouble(["--standard=$standard"]);
 
         $sniffClass = 'Fixtures\\TestStandard\\Sniffs\\InvalidSniffs\\RegisterNoArraySniff';
-        $message    = "ERROR: The sniff $sniffClass register() method must return an array.".PHP_EOL.PHP_EOL;
+        $message    = "ERROR: The sniff {$sniffClass}::register() method must return an array.".PHP_EOL.PHP_EOL;
         $this->expectRuntimeExceptionMessage($message);
 
         new Ruleset($config);