diff --git a/tests/EncoderTest.php b/tests/EncoderTest.php
index 834618c3..3a18e14a 100644
--- a/tests/EncoderTest.php
+++ b/tests/EncoderTest.php
@@ -61,6 +61,18 @@ class EncoderTest extends TestCase
         }
     }
 
+    /**
+     * @expectedException \Intervention\Image\Exception\NotSupportedException
+     */
+    public function testProcessAvifGd()
+    {
+        $core = imagecreatefromjpeg(__DIR__.'/images/test.jpg');
+        $encoder = new GdEncoder;
+        $image = Mockery::mock('\Intervention\Image\Image');
+        $img = $encoder->process($image, 'avif', 90);
+        $this->assertInstanceOf('Intervention\Image\Image', $img);
+    }
+
     /**
      * @expectedException \Intervention\Image\Exception\NotSupportedException
      */
@@ -180,6 +192,16 @@ class EncoderTest extends TestCase
         $img = $encoder->process($image, 'webp', 90);
     }
 
+    /**
+     * @expectedException \Intervention\Image\Exception\NotSupportedException
+     */
+    public function testProcessAvifImagick()
+    {
+        $encoder = new ImagickEncoder;
+        $image = Mockery::mock('\Intervention\Image\Image');
+        $img = $encoder->process($image, 'avif', 90);
+    }
+
     public function testProcessTiffImagick()
     {
         $core = $this->getImagickMock('tiff');