diff --git a/Viewable.php b/Source/Viewable.php
similarity index 96%
rename from Viewable.php
rename to Source/Viewable.php
index ec42dc3..a166f34 100644
--- a/Viewable.php
+++ b/Source/Viewable.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * Hoa
  *
@@ -40,9 +42,6 @@
  * Interface \Hoa\View\Viewable.
  *
  * Describe what a view could be.
- *
- * @copyright  Copyright © 2007-2017 Hoa community
- * @license    New BSD License
  */
 interface Viewable
 {
diff --git a/Test/Unit/Viewable.php b/Test/Unit/Viewable.php
index fa6d9ad..cdedcf4 100644
--- a/Test/Unit/Viewable.php
+++ b/Test/Unit/Viewable.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * Hoa
  *
@@ -37,22 +39,20 @@
 namespace Hoa\View\Test\Unit;
 
 use Hoa\Test;
+use Hoa\View as LUT;
 
 /**
  * Class \Hoa\View\Test\Unit\Viewable.
  *
  * Test suite of the interface.
- *
- * @copyright  Copyright © 2007-2017 Hoa community
- * @license    New BSD License
  */
 class Viewable extends Test\Unit\Suite
 {
-    public function case_interface()
+    public function case_interface(): void
     {
         $this
             ->when($result = new \Mock\Hoa\View\Viewable())
                 ->object($result)
-                    ->isInstanceOf('Hoa\View\Viewable');
+                    ->isInstanceOf(LUT\Viewable::class);
     }
 }
diff --git a/composer.json b/composer.json
index 42341b5..4e5793d 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
         "source": "https://central.hoa-project.net/Resource/Library/View"
     },
     "require": {
-        "php"            : ">=5.5.0",
+        "php"            : ">=7.1",
         "hoa/consistency": "~1.0"
     },
     "require-dev": {
@@ -31,7 +31,8 @@
     },
     "autoload": {
         "psr-4": {
-            "Hoa\\View\\": "."
+            "Hoa\\View\\"      : "Source",
+            "Hoa\\View\\Test\\": "Test"
         }
     },
     "suggest": {