tests: Adjust to new oleobj output

tests/oleobj/test_basic.py

@@ -69,16 +69,16 @@ def preread_file(args):
         raise ValueError('ignore_arg not as expected!')
     with open(filename, 'rb') as file_handle:
         data = file_handle.read()
-    err_stream, err_dumping, did_dump = \
+    err_stream, err_dumping, did_dump, found_external = \
         oleobj.process_file(filename, data, output_dir=output_dir)
-    if did_dump and not err_stream and not err_dumping:
+    if did_dump and not err_stream and not err_dumping and not found_external:
         return oleobj.RETURN_DID_DUMP
     else:
-        return oleobj.RETURN_NO_DUMP   # just anything else
+        return oleobj.RETURN_NO_DUMP   # just anything else, will cause error
 
 
 class TestOleObj(unittest.TestCase):
-    """ Tests oleobj basic feature """
+    """Tests oleobj basic feature: dump embedded content."""
 
     def setUp(self):
         """ fixture start: create temp dir """

tests/oleobj/test_external_links.py

@@ -26,7 +26,7 @@ def test_external_links(self):
 
                 output, ret_val = call_and_capture('oleobj', ['--nodump', file_path, ],
                                                    accept_nonzero_exit=True)
-                self.assertEqual(ret_val, oleobj.RETURN_DID_DUMP,
+                self.assertEqual(ret_val, oleobj.RETURN_FOUND_EXTERNAL,
                                  msg='Wrong return value {} for {}. Output:\n{}'
                                      .format(ret_val, filename, output))
                 found_relationship = False