diff --git a/docs/ObjectType.md b/docs/ObjectType.md
index b78f9d4c..1d481e0b 100644
--- a/docs/ObjectType.md
+++ b/docs/ObjectType.md
@@ -2,7 +2,7 @@
 
 - `ObjectType()`
 
-Validates if the input is an object.
+Validates whether the input is an [object](http://php.net/types.object).
 
 ```php
 v::objectType()->validate(new stdClass); // true
diff --git a/library/Exceptions/ObjectTypeException.php b/library/Exceptions/ObjectTypeException.php
index e99701c8..5fdfe868 100644
--- a/library/Exceptions/ObjectTypeException.php
+++ b/library/Exceptions/ObjectTypeException.php
@@ -13,14 +13,23 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Exceptions;
 
-class ObjectTypeException extends ValidationException
+/**
+ * Exception class for ObjectType rule.
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class ObjectTypeException extends ValidationException
 {
+    /**
+     * {@inheritdoc}
+     */
     public static $defaultTemplates = [
         self::MODE_DEFAULT => [
-            self::STANDARD => '{{name}} must be an object',
+            self::STANDARD => '{{name}} must be of type object',
         ],
         self::MODE_NEGATIVE => [
-            self::STANDARD => '{{name}} must not be an object',
+            self::STANDARD => '{{name}} must not be of type object',
         ],
     ];
 }
diff --git a/library/Rules/ObjectType.php b/library/Rules/ObjectType.php
index 8440b1a5..23eb2c38 100644
--- a/library/Rules/ObjectType.php
+++ b/library/Rules/ObjectType.php
@@ -13,8 +13,19 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-class ObjectType extends AbstractRule
+use function is_object;
+
+/**
+ * Validates whether the input is an object.
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Henrique Moody <henriquemoody@gmail.com>
+ */
+final class ObjectType extends AbstractRule
 {
+    /**
+     * {@inheritdoc}
+     */
     public function validate($input): bool
     {
         return is_object($input);
diff --git a/tests/integration/rules/objectType.phpt b/tests/integration/rules/objectType.phpt
new file mode 100644
index 00000000..b67454db
--- /dev/null
+++ b/tests/integration/rules/objectType.phpt
@@ -0,0 +1,37 @@
+--FILE--
+<?php
+require 'vendor/autoload.php';
+
+use Respect\Validation\Exceptions\NestedValidationException;
+use Respect\Validation\Exceptions\ObjectTypeException;
+use Respect\Validation\Validator as v;
+
+try {
+    v::objectType()->check([]);
+} catch (ObjectTypeException $exception) {
+    echo $exception->getMainMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::objectType())->check(new stdClass());
+} catch (ObjectTypeException $exception) {
+    echo $exception->getMainMessage().PHP_EOL;
+}
+
+try {
+    v::objectType()->assert('test');
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+
+try {
+    v::not(v::objectType())->assert(new ArrayObject());
+} catch (NestedValidationException $exception) {
+    echo $exception->getFullMessage().PHP_EOL;
+}
+?>
+--EXPECTF--
+`{ }` must be of type object
+`[object] (stdClass: { })` must not be of type object
+- "test" must be of type object
+- `[traversable] (ArrayObject: { })` must not be of type object
diff --git a/tests/integration/rules/objectType_1.phpt b/tests/integration/rules/objectType_1.phpt
deleted file mode 100644
index 0edd9e2b..00000000
--- a/tests/integration/rules/objectType_1.phpt
+++ /dev/null
@@ -1,10 +0,0 @@
---FILE--
-<?php
-require 'vendor/autoload.php';
-
-use Respect\Validation\Validator as v;
-
-v::objectType()->assert(new stdClass());
-v::objectType()->check(new stdClass());
-?>
---EXPECTF--
diff --git a/tests/integration/rules/objectType_2.phpt b/tests/integration/rules/objectType_2.phpt
deleted file mode 100644
index 5271d883..00000000
--- a/tests/integration/rules/objectType_2.phpt
+++ /dev/null
@@ -1,29 +0,0 @@
---FILE--
-<?php
-require 'vendor/autoload.php';
-
-use Respect\Validation\Exceptions\ObjectTypeException;
-use Respect\Validation\Validator as v;
-
-try {
-    v::objectType()->check('');
-} catch (ObjectTypeException $exception) {
-    echo $exception->getMainMessage().PHP_EOL;
-}
-
-try {
-    v::objectType()->check(true);
-} catch (ObjectTypeException $exception) {
-    echo $exception->getMainMessage().PHP_EOL;
-}
-
-try {
-    v::objectType()->check(0);
-} catch (ObjectTypeException $exception) {
-    echo $exception->getMainMessage().PHP_EOL;
-}
-?>
---EXPECTF--
-"" must be an object
-`TRUE` must be an object
-0 must be an object
diff --git a/tests/integration/rules/objectType_3.phpt b/tests/integration/rules/objectType_3.phpt
deleted file mode 100644
index efb2cbcc..00000000
--- a/tests/integration/rules/objectType_3.phpt
+++ /dev/null
@@ -1,15 +0,0 @@
---FILE--
-<?php
-require 'vendor/autoload.php';
-
-use Respect\Validation\Exceptions\ObjectTypeException;
-use Respect\Validation\Validator as v;
-
-try {
-    v::not(v::objectType())->check(new stdClass());
-} catch (ObjectTypeException $exception) {
-    echo $exception->getMainMessage();
-}
-?>
---EXPECTF--
-`[object] (stdClass: { })` must not be an object
diff --git a/tests/integration/rules/objectType_4.phpt b/tests/integration/rules/objectType_4.phpt
deleted file mode 100644
index fbdf7cdd..00000000
--- a/tests/integration/rules/objectType_4.phpt
+++ /dev/null
@@ -1,11 +0,0 @@
---FILE--
-<?php
-require 'vendor/autoload.php';
-
-use Respect\Validation\Validator as v;
-
-v::not(v::objectType())->check('');
-v::not(v::objectType())->check(true);
-v::not(v::objectType())->check(0);
-?>
---EXPECTF--
\ No newline at end of file
diff --git a/tests/unit/Rules/ObjectTypeTest.php b/tests/unit/Rules/ObjectTypeTest.php
index 2784c21d..bcb46e57 100644
--- a/tests/unit/Rules/ObjectTypeTest.php
+++ b/tests/unit/Rules/ObjectTypeTest.php
@@ -13,59 +13,48 @@ declare(strict_types=1);
 
 namespace Respect\Validation\Rules;
 
-use PHPUnit\Framework\TestCase;
+use ArrayObject;
+use Respect\Validation\Test\RuleTestCase;
+use stdClass;
 
 /**
- * @group  rule
+ * @group rule
+ *
  * @covers \Respect\Validation\Rules\ObjectType
- * @covers \Respect\Validation\Exceptions\ObjectTypeException
+ *
+ * @author Alexandre Gomes Gaigalas <alexandre@gaigalas.net>
+ * @author Gabriel Caruso <carusogabriel34@gmail.com>
+ * @author Henrique Moody <henriquemoody@gmail.com>
  */
-class ObjectTypeTest extends TestCase
+final class ObjectTypeTest extends RuleTestCase
 {
-    protected $object;
-
-    protected function setUp(): void
-    {
-        $this->object = new ObjectType();
-    }
-
     /**
-     * @dataProvider providerForObject
+     * {@inheritdoc}
      */
-    public function testObject($input): void
+    public function providerForValidInput(): array
     {
-        self::assertTrue($this->object->__invoke($input));
-        $this->object->assert($input);
-        $this->object->check($input);
-    }
+        $rule = new ObjectType();
 
-    /**
-     * @dataProvider providerForNotObject
-     * @expectedException \Respect\Validation\Exceptions\ObjectTypeException
-     */
-    public function testNotObject($input): void
-    {
-        self::assertFalse($this->object->__invoke($input));
-        $this->object->assert($input);
-    }
-
-    public function providerForObject()
-    {
         return [
-            [new \stdClass()],
-            [new \ArrayObject()],
+            [$rule, new stdClass()],
+            [$rule, new ArrayObject()],
         ];
     }
 
-    public function providerForNotObject()
+    /**
+     * {@inheritdoc}
+     */
+    public function providerForInvalidInput(): array
     {
+        $rule = new ObjectType();
+
         return [
-            [''],
-            [null],
-            [121],
-            [[]],
-            ['Foo'],
-            [false],
+            [$rule, ''],
+            [$rule, null],
+            [$rule, 121],
+            [$rule, []],
+            [$rule, 'Foo'],
+            [$rule, false],
         ];
     }
 }