addressing @ElDeveloper comment

Author: antgonza

qiita_db/data.py

@@ -829,7 +829,7 @@ def delete(cls, ppd_id):
         ppd = cls(ppd_id)
         if ppd.status != 'sandbox':
             raise QiitaDBStatusError(
-                "Illegal operation on non sandbox preprocessed data")
+                "Illegal operation on non sandboxed preprocessed data")
         elif ppd.submitted_to_vamps_status() not in valid_submission_states:
             raise QiitaDBStatusError(
                 "Illegal operation. This preprocessed data has or is being "
@@ -1342,7 +1342,7 @@ def delete(cls, processed_data_id):
         """
         if cls(processed_data_id).status != 'sandbox':
             raise QiitaDBStatusError(
-                "Illegal operation on non sandbox processed data")
+                "Illegal operation on non sandboxed processed data")
 
         conn_handler = SQLConnectionHandler()
 

qiita_db/test/test_data.py

@@ -488,15 +488,19 @@ def test_delete_basic(self):
             ebi_study_accession=self.ebi_study_accession)
         PreprocessedData.delete(ppd.id)
 
-        # testing that it raises an error if ID doesn't exist
+        # testing that the deleted preprocessed data can't be instantiated
+        with self.assertRaises(QiitaDBUnknownIDError):
+            PreprocessedData(ppd.id)
+        # and for completeness testing that it raises an error if ID
+        # doesn't exist
         with self.assertRaises(QiitaDBUnknownIDError):
             PreprocessedData.delete(ppd.id)
 
         # testing that we can not remove cause the preprocessed data != sandbox
         with self.assertRaises(QiitaDBStatusError):
             PreprocessedData.delete(1)
 
-    def test_delete_advance(self):
+    def test_delete_advanced(self):
         # testing that we can not remove cause preprocessed data has been
         # submitted to EBI or VAMPS
         ppd = PreprocessedData.create(