testDms: Add test OOoDocument with OnlyOffice data

product/ERP5OOo/tests/testDms.py

@@ -2631,6 +2631,16 @@ return 1
     self.assertFalse(document.hasContentMd5())
     self.assertEqual(document.getExternalProcessingState(), 'empty')
 
+  def test_isOnlyOfficeDocumentBaseConvertable(self):
+    document = self.portal.document_module.newContent(
+      portal_type="Text",
+      data=makeFileUpload('TEST-en-002.docy'),
+      content_type="application/x-asc-text",
+    )
+    document.convertToBaseFormat()
+    self.tic()
+    document.convert(format="docy")
+
   def _test_document_publication_workflow(self, portal_type, transition):
     document = self.getDocumentModule().newContent(portal_type=portal_type)
     self.portal.portal_workflow.doActionFor(document, transition)