There are several issues with error reports when doctests are wrapped inDocTestCase.

• When error happens during compilation or execution an example, the traceback contains several lines fromdoctest.py:

      File ...      exec(compile(example.source, filename, "single",      ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                   compileflags, True), test.globs)                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

• When the output differs, the traceback of AssertionError contains other line fromdoctest.py:

    Traceback (most recent call last):    File ...      raise self.failureException(self.format_failure(new.getvalue()))

• Also, the AssertionError message contains redundant newline character.

Linked PRs

• gh-134857: Improve error report for doctests run with unittest #134858
• [3.14] gh-134857: Improve error report for doctests run with unittest (GH-134858) #134903