diff --git a/src/TestsExcelDocuments.php b/src/TestsExcelDocuments.php
index 61088d8..b36c6e8 100644
--- a/src/TestsExcelDocuments.php
+++ b/src/TestsExcelDocuments.php
@@ -11,14 +11,17 @@ trait TestsExcelDocuments
 
     public function assertExcelContent(string $should, string $content): void
     {
+        $output = '';
         $filename = sys_get_temp_dir() . '/' . str()->uuid()->toString();
         file_put_contents($filename, $content);
         $spreadsheet = IOFactory::load($filename, 0, [IOFactory::READER_XLSX]);
+
         $writer = new Csv($spreadsheet);
-        $writer->save($filename);
+        foreach ($spreadsheet->getAllSheets() as $i => $sheet) {
+            $writer->setSheetIndex($i)->save($filename);
+            $output .= file_get_contents($filename);
+        }
         $spreadsheet->disconnectWorksheets();
-        $contents = file_get_contents($filename);
-        unlink($filename);
-        Assert::assertStringContainsString($should, $contents);
+        Assert::assertStringContainsString($should, $output);
     }
 }