diff --git a/src/PhpSpreadsheet/Reader/Csv.php b/src/PhpSpreadsheet/Reader/Csv.php
index db2b50b9..30b39a9b 100644
--- a/src/PhpSpreadsheet/Reader/Csv.php
+++ b/src/PhpSpreadsheet/Reader/Csv.php
@@ -522,6 +522,7 @@ class Csv extends BaseReader
 
         // Attempt to guess mimetype
         $type = mime_content_type($pFilename);
+        var_dump($type);
         $supportedTypes = [
             'text/csv',
             'text/plain',
diff --git a/tests/PhpSpreadsheetTests/Writer/Csv/CsvEnclosureTest.php b/tests/PhpSpreadsheetTests/Writer/Csv/CsvEnclosureTest.php
index d048183c..d4799356 100644
--- a/tests/PhpSpreadsheetTests/Writer/Csv/CsvEnclosureTest.php
+++ b/tests/PhpSpreadsheetTests/Writer/Csv/CsvEnclosureTest.php
@@ -153,6 +153,7 @@ class CsvEnclosureTest extends Functional\AbstractFunctional
         $writer->save($filename);
         $filedata = file_get_contents($filename);
         $filedata = preg_replace('/\\r/', '', $filedata);
+        var_dump($filedata);
         $reader = new CsvReader();
         $reader->setDelimiter($delimiter);
         $reader->setEnclosure($enclosure);