diff --git a/src/WritersInstance.php b/src/WritersInstance.php
index 846d516..36d1c09 100644
--- a/src/WritersInstance.php
+++ b/src/WritersInstance.php
@@ -18,23 +18,18 @@
 
 final class WritersInstance
 {
-    private static ?WritersInterface $instance;
+    private static WritersInterface $instance;
 
     public function __construct(WritersInterface $writers)
     {
         self::$instance = $writers;
     }
 
-    public function __destruct()
-    {
-        self::$instance = null;
-    }
-
     public static function get(): WritersInterface
     {
         if (! isset(self::$instance)) {
             throw new LogicException(
-                'No writers instance present'
+                sprintf('No `%s` instance present', WritersInterface::class)
             );
         }
 
diff --git a/tests/FunctionsTest.php b/tests/FunctionsTest.php
index 0d52d19..fd0a699 100644
--- a/tests/FunctionsTest.php
+++ b/tests/FunctionsTest.php
@@ -22,12 +22,18 @@
 
 final class FunctionsTest extends TestCase
 {
+    public function testWritersNoInstance(): void
+    {
+        $this->expectException(LogicException::class);
+        writers();
+    }
+
     public function testWritersInstance(): void
     {
         $writers = new Writers();
         $instance = new WritersInstance($writers);
+        $this->assertSame($writers, writers());
         $this->assertSame($instance->get(), writers());
-        unset($instance);
     }
 
     public function testStreamFor(): void
diff --git a/tests/WritersInstanceTest.php b/tests/WritersInstanceTest.php
index 7e02d61..074c665 100644
--- a/tests/WritersInstanceTest.php
+++ b/tests/WritersInstanceTest.php
@@ -15,22 +15,14 @@
 
 use Chevere\Writer\Writers;
 use Chevere\Writer\WritersInstance;
-use LogicException;
 use PHPUnit\Framework\TestCase;
 
 final class WritersInstanceTest extends TestCase
 {
-    public function testNoConstruct(): void
-    {
-        $this->expectException(LogicException::class);
-        WritersInstance::get();
-    }
-
     public function testConstruct(): void
     {
         $writers = new Writers();
         $instance = new WritersInstance($writers);
         $this->assertSame($writers, $instance::get());
-        unset($instance);
     }
 }