diff --git a/library/Exceptions/IntValException.php b/library/Exceptions/IntValException.php
index a67dc8db..5b57a0f9 100644
--- a/library/Exceptions/IntValException.php
+++ b/library/Exceptions/IntValException.php
@@ -13,8 +13,16 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Exceptions;
 
-class IntValException extends ValidationException
+/**
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class IntValException extends ValidationException
 {
+    /**
+     * {@inheritdoc}
+     */
     public static $defaultTemplates = [
         self::MODE_DEFAULT => [
             self::STANDARD => '{{name}} must be an integer number',
diff --git a/library/Rules/IntVal.php b/library/Rules/IntVal.php
index dd1e4805..8c3387f8 100644
--- a/library/Rules/IntVal.php
+++ b/library/Rules/IntVal.php
@@ -13,7 +13,17 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-class IntVal extends AbstractRule
+use function filter_var;
+use function is_float;
+
+/**
+ * Validates if the input is an integer.
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class IntVal extends AbstractRule
 {
     public function validate($input): bool
     {
diff --git a/tests/integration/intVal.phpt b/tests/integration/intVal.phpt
new file mode 100644
index 00000000..34e0f692
--- /dev/null
+++ b/tests/integration/intVal.phpt
@@ -0,0 +1,37 @@
+--FILE--
+<?php
+require 'vendor/autoload.php';
+
+use Respect\Validation\Exceptions\intValException;
+use Respect\Validation\Exceptions\NestedValidationException;
+use Respect\Validation\Validator as v;
+
+try {
+    v::intVal()->check('42.33');
+} catch (intValException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::intVal())->check(2);
+} catch (intValException $exception) {
+    echo $exception->getMessage().PHP_EOL;
+}
+
+try {
+    v::intVal()->assert('Foo');
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::intVal())->assert(3);
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+?>
+--EXPECTF--
+"42.33" must be an integer number
+2 must not be an integer number
+- "Foo" must be an integer number
+- 3 must not be an integer number
diff --git a/tests/unit/Rules/IntValTest.php b/tests/unit/Rules/IntValTest.php
index 4d9508d8..40b3ace4 100644
--- a/tests/unit/Rules/IntValTest.php
+++ b/tests/unit/Rules/IntValTest.php
@@ -13,64 +13,52 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-use PHPUnit\Framework\TestCase;
+use Respect\Validation\Test\RuleTestCase;
 
 /**
- * @group  rule
+ * @group rule
+ *
  * @covers \Respect\Validation\Rules\IntVal
- * @covers \Respect\Validation\Exceptions\IntValException
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Danilo Benevides <danilobenevides01@gmail.com>
+ * @author Gabriel Caruso <carusogabriel34@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
  */
-class IntValTest extends TestCase
+final class IntValTest extends RuleTestCase
 {
-    protected $intValidator;
-
-    protected function setUp(): void
+    /*
+    * {@inheritdoc}
+    */
+    public function providerForValidInput(): array
     {
-        $this->intValidator = new IntVal();
-    }
+        $rule = new IntVal();
 
-    /**
-     * @dataProvider providerForInt
-     */
-    public function testValidIntegersShouldReturnTrue($input): void
-    {
-        self::assertTrue($this->intValidator->__invoke($input));
-        $this->intValidator->check($input);
-        $this->intValidator->assert($input);
-    }
-
-    /**
-     * @dataProvider providerForNotInt
-     * @expectedException \Respect\Validation\Exceptions\IntValException
-     */
-    public function testInvalidIntegersShouldThrowIntException($input): void
-    {
-        self::assertFalse($this->intValidator->__invoke($input));
-        $this->intValidator->assert($input);
-    }
-
-    public function providerForInt()
-    {
         return [
-            [16],
-            ['165'],
-            [123456],
-            [PHP_INT_MAX],
+            [$rule, 16],
+            [$rule, '165'],
+            [$rule, 123456],
+            [$rule, PHP_INT_MAX],
         ];
     }
 
-    public function providerForNotInt()
+    /*
+    * {@inheritdoc}
+    */
+    public function providerForInvalidInput(): array
     {
+        $rule = new IntVal();
+
         return [
-            [''],
-            [null],
-            ['a'],
-            ['1.0'],
-            [1.0],
-            [' '],
-            ['Foo'],
-            ['1.44'],
-            [1e-5],
+            [$rule, ''],
+            [$rule, null],
+            [$rule, 'a'],
+            [$rule, '1.0'],
+            [$rule, 1.0],
+            [$rule, ' '],
+            [$rule, 'Foo'],
+            [$rule, '1.44'],
+            [$rule, 1e-5],
         ];
     }
 }