diff --git a/src/models/File.php b/src/models/File.php
index f3d2870..316d293 100644
--- a/src/models/File.php
+++ b/src/models/File.php
@@ -47,7 +47,7 @@ public function fields()
     public function rules()
     {
         return [
-            [['name', 'model', 'itemId', 'hash', 'size', 'type', 'mime'], 'required'],
+            [['name', 'model', 'itemId', 'hash', 'size', 'mime'], 'required'],
             [['itemId', 'size'], 'integer'],
             [['name', 'model', 'hash', 'type', 'mime'], 'string', 'max' => 255]
         ];
diff --git a/tests/FileControllerTest.php b/tests/FileControllerTest.php
index e7fcee1..79ed1d7 100644
--- a/tests/FileControllerTest.php
+++ b/tests/FileControllerTest.php
@@ -123,4 +123,57 @@ public function testPreUpload5()
         $errorMessage = 'Only files with these MIME types are allowed: image/png, image/jpeg.';
         $this->assertTrue(in_array($errorMessage, $response['error']));
     }
+
+    public function testPreUpload6()
+    {
+        $types = ['png', ''];
+        $this->generateFiles($types);
+        $response = Yii::$app->runAction('attachments/file/upload');
+        $this->assertArrayHasKey('uploadedFiles', $response);
+        $this->assertTrue(in_array('file', $response['uploadedFiles']));
+        $this->checkFilesExist($types);
+
+        foreach ($types as $type) {
+            $fileType = empty($type) ? $type : ".".$type;
+            /** @var Response $response */
+            $response = Yii::$app->runAction('attachments/file/download-temp', ['filename' => "file$fileType"]);
+            ob_start();
+            $response->send();
+            $actual = ob_get_clean();
+            $response->clear();
+            $expected = file_get_contents(Yii::getAlias("@tests/files/file$fileType"));
+            $this->assertEquals($expected, $actual);
+
+            $response = Yii::$app->runAction('attachments/file/delete-temp', ['filename' => "file$fileType"]);
+            $this->assertEquals($response, []);
+        }
+        $this->checkFilesNotExist($types);
+        $this->assertFileNotExists($this->getTempDirPath());
+
+        $comment = new Comment();
+        $comment->text = 'test';
+        $this->assertTrue($comment->save());
+
+        foreach ($comment->files as $file) {
+            $fileType = empty($file->type) ? $file->type : ".".$file->type;
+            /** @var Response $response */
+            $response = Yii::$app->runAction('attachments/file/download', ['id' => $file->id]);
+            ob_start();
+            $response->send();
+            $actual = ob_get_clean();
+            $response->clear();
+            $expected = file_get_contents(Yii::getAlias("@tests/files/file{$fileType}"));
+            $this->assertEquals($expected, $actual);
+            $this->assertFileExists($file->path);
+            $response = Yii::$app->runAction('attachments/file/delete', ['id' => -1]);
+            $this->assertEquals($response, false);
+            $response = Yii::$app->runAction('attachments/file/delete', ['id' => $file->id]);
+            $this->assertEquals($response, true);
+            $this->assertFileNotExists($file->path);
+        }
+
+        $this->assertNotSame(false, $comment->delete());
+
+    }
+
 }
diff --git a/tests/FileTest.php b/tests/FileTest.php
index 2a1d234..f80d46f 100644
--- a/tests/FileTest.php
+++ b/tests/FileTest.php
@@ -22,7 +22,7 @@ public function testValidate()
         $this->assertArrayHasKey('itemId', $file->errors);
         $this->assertArrayHasKey('hash', $file->errors);
         $this->assertArrayHasKey('size', $file->errors);
-        $this->assertArrayHasKey('type', $file->errors);
+        //$this->assertArrayHasKey('type', $file->errors);
         $this->assertArrayHasKey('mime', $file->errors);
     }
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 88ae47f..92f52a6 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -113,7 +113,7 @@ public function generateFiles($types)
         UploadedFile::reset();
 
         foreach ($types as $index => $type) {
-            $file = "file.$type";
+            $file = $type ? "file.$type" : "file";
             $path = Yii::getAlias("@tests/files/$file");
             $_FILES["UploadForm[file][$index]"] = [
                 'name' => $file,
@@ -128,7 +128,8 @@ public function generateFiles($types)
     public function checkFilesExist($types)
     {
         foreach ($types as $type) {
-            $filePath = $this->getTempDirPath() . "/file.$type";
+            $file = $type ? "/file.$type" : "/file";
+            $filePath = $this->getTempDirPath() . $file;
             $this->assertFileExists($filePath);
         }
     }
@@ -136,7 +137,8 @@ public function checkFilesExist($types)
     public function checkFilesNotExist($types)
     {
         foreach ($types as $type) {
-            $filePath = $this->getTempDirPath() . "/file.$type";
+            $file = $type ? "/file.$type" : "/file";
+            $filePath = $this->getTempDirPath() . $file;
             $this->assertFileNotExists($filePath);
         }
     }
diff --git a/tests/data/db.sqlite b/tests/data/db.sqlite
index ff2b87b..07b0d48 100644
Binary files a/tests/data/db.sqlite and b/tests/data/db.sqlite differ
diff --git a/tests/files/file b/tests/files/file
new file mode 100644
index 0000000..6c8db5d
--- /dev/null
+++ b/tests/files/file
@@ -0,0 +1 @@
+file 1
\ No newline at end of file