diff --git a/src/Validator/Validator.php b/src/Validator/Validator.php
index 7bdd03e..0d6bdbb 100644
--- a/src/Validator/Validator.php
+++ b/src/Validator/Validator.php
@@ -31,7 +31,7 @@ class Validator
         }
         $propertyAnnotations = $this->_getPropertyAnnotations($property);
 
-        if (empty($value) && !in_array('required', $propertyAnnotations, true)) {
+        if (empty($value) && count(array_filter($property['rules'], static fn($rule) => str_starts_with($rule, 'required'))) === 0) {
             return true;
         }
 
@@ -69,9 +69,9 @@ class Validator
      */
     public function isObjectValid($object): bool
     {
-        if (!$object->validated) {
+//        if (!$object->validated) {
             $object = $this->validateObject($object);
-        }
+//        }
 
         return !in_array(false, $object->validated, true);
     }
@@ -91,7 +91,7 @@ class Validator
         foreach ($properties as $property) {
             $propertyValue = $object->{$property['name']};
 
-            if (empty($propertyValue) && !in_array('required', $property['rules'], true)) {
+            if (empty($propertyValue) && count(array_filter($property['rules'], static fn($rule) => str_starts_with($rule, 'required'))) === 0) {
                 continue;
             }
 
@@ -117,7 +117,7 @@ class Validator
 
         $args_annotation = array_splice($annotation, 1);
 
-        return $this->{sprintf('_validate%s', ucfirst($annotation[0]))}($property, ...$args_annotation);
+        return $this->{sprintf('_validate%s', ucfirst($annotation[0]))}($property, $args_annotation);
     }
 
 
@@ -199,7 +199,6 @@ class Validator
     {
         $options = [
             'options' => [
-                'default' => 0,
                 'min_range' => 0,
                 'max_range' => 23
             ]
diff --git a/tests/FailingTest.php b/tests/FailingTest.php
new file mode 100644
index 0000000..17291e1
--- /dev/null
+++ b/tests/FailingTest.php
@@ -0,0 +1,114 @@
+<?php
+
+use PHPUnit\Framework\TestCase;
+use Shikiryu\SRSS\SRSS;
+
+class FailingTest extends TestCase
+{
+    private ?SRSS $srss;
+
+    public function testInvalidChannel()
+    {
+        $this->srss = SRSS::create();
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->title = 'title'; // mandatory
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->description = 'desc'; // mandatory
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->link = 'desc'; // mandatory but should be a url
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->link = 'https://example.org';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->language = 'en-en'; // should be a valid language
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->language = 'en-us'; // should be a valid
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->copyright = '<strong>test</strong>'; // should not have html element
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->copyright = 'shikiryu';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->managingEditor = '<strong>test</strong>'; // should not have html element
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->managingEditor = 'shikiryu';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->webMaster = '<strong>test</strong>'; // should not have html element
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->webMaster = 'shikiryu';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->pubDate = 'test'; // should be a valid date
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->pubDate = (new DateTime())->format(DATE_RSS);
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->lastBuildDate = 'test'; // should be a valid date
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->lastBuildDate = (new DateTime())->format(DATE_RSS);
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->generator = '<strong>test</strong>'; // should not have html element
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->generator = 'shikiryuRSS';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->docs = 'desc'; //should be a url
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->docs = 'https://example.org';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->ttl = 'desc'; // should be an int
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->ttl = '85';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        // rating and textInput not tested because there's no validation
+
+        $this->srss->skipHours = 'desc'; // should be an hour
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->skipHours = '12';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+
+        $this->srss->skipDays = 'desc'; // should be a day
+        self::assertFalse($this->srss->isValid(), var_export($this->srss->validated, true));
+        $this->srss->skipDays = 'monday';
+        self::assertTrue($this->srss->isValid(), var_export($this->srss->validated, true));
+    }
+
+    public function testItem()
+    {
+        $item = new Shikiryu\SRSS\Entity\Item();
+
+        self::assertFalse($item->isValid(), var_export($item->validated, true));
+        $item->title = 'title';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+
+        $item->link = 'test';
+        self::assertFalse($item->isValid(), var_export($item->validated, true));
+        $item->link = 'https://example.org/link1';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+
+        $item->title = null;
+        self::assertFalse($item->isValid(), var_export($item->validated, true));
+        $item->description = 'desc';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+        $item->title = 'title';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+
+        $item->author = 'test';
+        self::assertFalse($item->isValid(), var_export($item->validated, true));
+        $item->author = 'email@example.org';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+
+        $item->comments = 'test';
+        self::assertFalse($item->isValid(), var_export($item->validated, true));
+        $item->comments = 'https://example.org/link1';
+        self::assertTrue($item->isValid(), var_export($item->validated, true));
+
+        // guid is not validated and, so, not tested
+    }
+}
\ No newline at end of file