Fixed transcript testing bug where last command in transcript has no expected output

Also:
- Added unit test for this specific case

Author: tleonhardt

CHANGELOG.md

@@ -3,6 +3,7 @@
     * Fixed bug where ``get_all_commands`` could return non-callable attributes
     * Fixed bug where **alias** command was dropping quotes around arguments
     * Fixed bug where running help on argparse commands didn't work if they didn't support -h
+    * Fixed transcript testing bug where last command in transcript has no expected output
 * Enhancements
     * Added ``exit_code`` attribute of ``cmd2.Cmd`` class
         * Enables applications to return a non-zero exit code when exiting from ``cmdloop``

cmd2/transcript.py

@@ -67,7 +67,10 @@ def _test_transcript(self, fname: str, transcript):
                     break
                 line_num += 1
             command = [line[len(self.cmdapp.visible_prompt):]]
-            line = next(transcript)
+            try:
+                line = next(transcript)
+            except StopIteration:
+                line = ''
             # Read the entirety of a multi-line command
             while line.startswith(self.cmdapp.continuation_prompt):
                 command.append(line[len(self.cmdapp.continuation_prompt):])

tests/test_transcript.py

@@ -103,6 +103,7 @@ def test_commands_at_invocation():
     ('multiline_no_regex.txt', False),
     ('multiline_regex.txt', False),
     ('no_output.txt', False),
+    ('no_output_last.txt', False),
     ('regex_set.txt', False),
     ('singleslash.txt', False),
     ('slashes_escaped.txt', False),

tests/transcripts/no_output.txt

@@ -1,4 +1,4 @@
-# ensure the transcript can play a command with no output
+# ensure the transcript can play a command with no output from a command somewhere in the middle
 
 (Cmd) say something
 something

tests/transcripts/no_output_last.txt

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