diff --git a/tests/Unit/FileExtensionTest.php b/tests/Unit/FileExtensionTest.php
index 33d73c6e..13ced4fe 100644
--- a/tests/Unit/FileExtensionTest.php
+++ b/tests/Unit/FileExtensionTest.php
@@ -24,6 +24,9 @@ final class FileExtensionTest extends BaseTestCase
         $this->assertEquals(FileExtension::JPG, FileExtension::create('jpg'));
         $this->assertEquals(FileExtension::JPEG, FileExtension::create('jpeg'));
         $this->assertEquals(FileExtension::JPG, FileExtension::create('image/jpeg'));
+        $this->assertEquals(FileExtension::JPG, FileExtension::create('JPG'));
+        $this->assertEquals(FileExtension::JPEG, FileExtension::create('JPEG'));
+        $this->assertEquals(FileExtension::JPG, FileExtension::create('IMAGE/JPEG'));
     }
 
     public function testCreateUnknown(): void
diff --git a/tests/Unit/FormatTest.php b/tests/Unit/FormatTest.php
index dc8274df..33a359c1 100644
--- a/tests/Unit/FormatTest.php
+++ b/tests/Unit/FormatTest.php
@@ -30,6 +30,10 @@ final class FormatTest extends BaseTestCase
         $this->assertEquals(Format::JPEG, Format::create('jpeg'));
         $this->assertEquals(Format::JPEG, Format::create('image/jpeg'));
         $this->assertEquals(Format::GIF, Format::create('image/gif'));
+        $this->assertEquals(Format::JPEG, Format::create('JPG'));
+        $this->assertEquals(Format::JPEG, Format::create('JPEG'));
+        $this->assertEquals(Format::JPEG, Format::create('IMAGE/JPEG'));
+        $this->assertEquals(Format::GIF, Format::create('IMAGE/GIF'));
         $this->assertEquals(Format::PNG, Format::create(FileExtension::PNG));
         $this->assertEquals(Format::WEBP, Format::create(MediaType::IMAGE_WEBP));
     }
diff --git a/tests/Unit/MediaTypeTest.php b/tests/Unit/MediaTypeTest.php
index b9643bcb..d80e76f5 100644
--- a/tests/Unit/MediaTypeTest.php
+++ b/tests/Unit/MediaTypeTest.php
@@ -24,6 +24,9 @@ final class MediaTypeTest extends BaseTestCase
         $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('jpg'));
         $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('jpeg'));
         $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('image/jpeg'));
+        $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('JPG'));
+        $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('JPEG'));
+        $this->assertEquals(MediaType::IMAGE_JPEG, MediaType::create('IMAGE/JPEG'));
     }
 
     public function testCreateUnknown(): void