Add transcript test for commands with no output

Author: kotfu

tests/test_transcript.py

@@ -77,6 +77,10 @@ def do_mumble(self, opts, arg):
                 output.append(random.choice(self.MUMBLE_LAST))
             self.poutput(' '.join(output))
 
+    def do_nothing(self, statement):
+        """Do nothing and output nothing"""
+        pass
+
 
 def test_commands_at_invocation():
     testargs = ["prog", "say hello", "say Gracie", "quit"]
@@ -96,6 +100,7 @@ def test_commands_at_invocation():
     ('from_cmdloop.txt', True),
     ('multiline_no_regex.txt', False),
     ('multiline_regex.txt', False),
+    ('no_output.txt', False),
     ('regex_set.txt', False),
     ('singleslash.txt', False),
     ('slashes_escaped.txt', False),
@@ -123,7 +128,7 @@ def test_transcript(request, capsys, filename, feedback_to_output):
     # Check for the unittest "OK" condition for the 1 test which ran
     expected_start = ".\n----------------------------------------------------------------------\nRan 1 test in"
     expected_end = "s\n\nOK\n"
-    out, err = capsys.readouterr()
+    _, err = capsys.readouterr()
     assert err.startswith(expected_start)
     assert err.endswith(expected_end)
 

tests/transcripts/from_cmdloop.txt

@@ -5,8 +5,8 @@
 
 Documented commands (type help <topic>):
 ========================================
-alias  help     load    orate  pyscript  say  shell      speak/ */
-edit   history  mumble  py     quit      set  shortcuts  unalias/ */
+alias  help     load    nothing  py        quit  set    shortcuts  unalias/ */
+edit   history  mumble  orate    pyscript  say   shell  speak/ */
 
 (Cmd) help say
 usage: speak [-h] [-p] [-s] [-r REPEAT]/ */

tests/transcripts/no_output.txt

@@ -0,0 +1,7 @@
+# ensure the transcript can play a command with no output
+
+(Cmd) say something
+something
+(Cmd) nothing
+(Cmd) say something else
+something else