Apply "SlevomatCodingStandard.Variables.UnusedVariable"

Signed-off-by: Henrique Moody <henriquemoody@gmail.com>

library/Rules/KeyValue.php

@@ -13,6 +13,7 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
+use function array_keys;
 use Respect\Validation\Exceptions\ComponentException;
 use Respect\Validation\Exceptions\ValidationException;
 use Respect\Validation\Validatable;
@@ -75,7 +76,7 @@ class KeyValue extends AbstractRule
     private function overwriteExceptionParams(ValidationException $exception): ValidationException
     {
         $params = [];
-        foreach ($exception->getParams() as $key => $value) {
+        foreach (array_keys($exception->getParams()) as $key) {
             if (in_array($key, ['template', 'translator'])) {
                 continue;
             }

phpcs.xml.dist

@@ -86,6 +86,7 @@
     </rule>
     <rule ref="SlevomatCodingStandard.TypeHints.UselessConstantTypeHint" />
     <rule ref="SlevomatCodingStandard.Variables.DuplicateAssignmentToVariable" />
+    <rule ref="SlevomatCodingStandard.Variables.UnusedVariable" />
     <rule ref="SlevomatCodingStandard.Variables.UselessVariable" />
     <rule ref="Squiz.PHP.CommentedOutCode" />
     <rule ref="Squiz.WhiteSpace.FunctionSpacing">

tests/unit/Rules/AbstractRelatedTest.php

@@ -155,8 +155,6 @@ final class AbstractRelatedTest extends TestCase
      */
     public function shouldNotDefineRuleNameAsReferenceWhenRuleDoesHaveName(): void
     {
-        $reference = 'something';
-
         $ruleMock = $this->createMock(Validatable::class);
         $ruleMock
             ->expects(self::at(0))
@@ -195,8 +193,6 @@ final class AbstractRelatedTest extends TestCase
     public function shouldDefineChildNameWhenDefiningTheNameOfTheParent(): void
     {
         $name = 'My new name';
-        $reference = 'something';
-
         $ruleMock = $this->createMock(Validatable::class);
         $ruleMock
             ->expects(self::at(0))
@@ -207,7 +203,7 @@ final class AbstractRelatedTest extends TestCase
             ->method('setName')
             ->with($name);
 
-        $abstractMock = $this
+        $this
             ->getMockBuilder(AbstractRelated::class)
             ->setConstructorArgs(['something', $ruleMock])
             ->getMock();