Common::getSniffCode(): throw exception on invalid input [2b]

Previously, if an invalid class name was passed, which didn't end on `Sniff` or `UnitTest`, the `Common::getSniffCode()` method would return a garbled name, like `Fully.Qualified.C`, which is just confusing.

This commit changes the behaviour to throw an `InvalidArgumentException` instead.

Includes test.

Author: jrfnl

src/Util/Common.php

@@ -543,7 +543,7 @@ public static function getSniffCode($sniffClass)
         $parts = explode('\\', $sniffClass);
         if (count($parts) < 4) {
             throw new InvalidArgumentException(
-                'The $sniffClass parameter was not passed a fully qualified sniff class name. Received: '.$sniffClass
+                'The $sniffClass parameter was not passed a fully qualified sniff(test) class name. Received: '.$sniffClass
             );
         }
 
@@ -552,9 +552,13 @@ public static function getSniffCode($sniffClass)
         if (substr($sniff, -5) === 'Sniff') {
             // Sniff class name.
             $sniff = substr($sniff, 0, -5);
-        } else {
+        } else if (substr($sniff, -8) === 'UnitTest') {
             // Unit test class name.
             $sniff = substr($sniff, 0, -8);
+        } else {
+            throw new InvalidArgumentException(
+                'The $sniffClass parameter was not passed a fully qualified sniff(test) class name. Received: '.$sniffClass
+            );
         }
 
         $category = array_pop($parts);

tests/Core/Util/Common/GetSniffCodeTest.php

@@ -79,7 +79,7 @@ public static function dataGetSniffCodeThrowsExceptionOnInvalidInput()
     public function testGetSniffCodeThrowsExceptionOnInputWhichIsNotASniffTestClass($input)
     {
         $exception = 'InvalidArgumentException';
-        $message   = 'The $sniffClass parameter was not passed a fully qualified sniff class name. Received:';
+        $message   = 'The $sniffClass parameter was not passed a fully qualified sniff(test) class name. Received:';
 
         if (method_exists($this, 'expectException') === true) {
             // PHPUnit 5+.
@@ -105,8 +105,9 @@ public function testGetSniffCodeThrowsExceptionOnInputWhichIsNotASniffTestClass(
     public static function dataGetSniffCodeThrowsExceptionOnInputWhichIsNotASniffTestClass()
     {
         return [
-            'Unqualified class name'                       => ['ClassName'],
-            'Fully qualified class name, not enough parts' => ['Fully\\Qualified\\ClassName'],
+            'Unqualified class name'                                        => ['ClassName'],
+            'Fully qualified class name, not enough parts'                  => ['Fully\\Qualified\\ClassName'],
+            'Fully qualified class name, doesn\'t end on Sniff or UnitTest' => ['Fully\\Sniffs\\Qualified\\ClassName'],
         ];
 
     }//end dataGetSniffCodeThrowsExceptionOnInputWhichIsNotASniffTestClass()