Improved header tests

src/Appwrite/Functions/Validator/Headers.php

@@ -47,6 +47,10 @@ class Headers extends Validator
             $value = \json_decode($value, true);
         }
 
+        if (!\is_array($value)) {
+            return false;
+        }
+
         if (json_last_error() !== JSON_ERROR_NONE) {
             return false;
         } else {

tests/unit/Functions/Validator/HeadersTest.php

@@ -95,5 +95,14 @@ class HeadersTest extends TestCase
             'a' => 'b',
         ];
         $this->assertTrue($this->object->isValid($headers));
+
+        $headers = 123;
+        $this->assertFalse($this->object->isValid($headers));
+
+        $headers = true;
+        $this->assertFalse($this->object->isValid($headers));
+
+        $headers = 'string';
+        $this->assertFalse($this->object->isValid($headers));
     }
 }