Apply contribution guidelines to "Fibonacci" rule

Co-authored-by: Henrique Moody <henriquemoody@gmail.com>

library/Exceptions/FibonacciException.php

@@ -13,8 +13,16 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Exceptions;
 
-class FibonacciException extends ValidationException
+/**
+ * @author Danilo Correa <danilosilva87@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Samuel Heinzmann <samuel.heinzmann@swisscom.com>
+ */
+final class FibonacciException extends ValidationException
 {
+    /**
+     * {@inheritdoc}
+     */
     public static $defaultTemplates = [
         self::MODE_DEFAULT => [
             self::STANDARD => '{{name}} must be a valid Fibonacci number',

library/Rules/Fibonacci.php

@@ -13,10 +13,16 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
+use function is_numeric;
+
 /**
- * @author Samuel Heinzmann <samuel.heinzman@swisscom.com>
+ * Validates whether the input follows the Fibonacci integer sequence.
+ *
+ * @author Danilo Correa <danilosilva87@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Samuel Heinzmann <samuel.heinzmann@swisscom.com>
  */
-class Fibonacci extends AbstractRule
+final class Fibonacci extends AbstractRule
 {
     /**
      * {@inheritdoc}

tests/integration/rules/fibonacci.phpt

@@ -0,0 +1,37 @@
+--FILE--
+<?php
+require 'vendor/autoload.php';
+
+use Respect\Validation\Exceptions\FibonacciException;
+use Respect\Validation\Exceptions\NestedValidationException;
+use Respect\Validation\Validator as v;
+
+try {
+    v::fibonacci()->check(4);
+} catch (FibonacciException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::fibonacci())->check(5);
+} catch (FibonacciException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::fibonacci()->assert(16);
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::fibonacci())->assert(21);
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+?>
+--EXPECTF--
+4 must be a valid Fibonacci number
+5 must not be a valid Fibonacci number
+- 16 must be a valid Fibonacci number
+- 21 must not be a valid Fibonacci number

tests/unit/Rules/FibonacciTest.php

@@ -16,11 +16,19 @@ namespace Respect\Validation\Rules;
 use Respect\Validation\Test\RuleTestCase;
 
 /**
- * @group  rule
+ * @group rule
+ *
  * @covers \Respect\Validation\Rules\Fibonacci
+ *
+ * @author Danilo Correa <danilosilva87@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ * @author Samuel Heinzmann <samuel.heinzmann@swisscom.com>
  */
-class FibonacciTest extends RuleTestCase
+final class FibonacciTest extends RuleTestCase
 {
+    /**
+     * {@inheritdoc}
+     */
     public function providerForValidInput(): array
     {
         $rule = new Fibonacci();
@@ -42,6 +50,9 @@ class FibonacciTest extends RuleTestCase
         ];
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function providerForInvalidInput(): array
     {
         $rule = new Fibonacci();