In output_difference(), replace blank lines in `want` with <BLANKLINE>
(rather than replacing <BLANKLINE> with blank lines in `got`). This
makes it easier to see what's intended.
diff --git a/Lib/doctest.py b/Lib/doctest.py
index 9b91277..a98df1a 100644
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -1492,10 +1492,10 @@
compare `want` and `got`. `indent` is the indentation of the
original example.
"""
- # If <BLANKLINE>s are being used, then replace <BLANKLINE>
- # with blank lines in the expected output string.
+ # If <BLANKLINE>s are being used, then replace blank lines
+ # with <BLANKLINE> in the actual output string.
if not (optionflags & DONT_ACCEPT_BLANKLINE):
- want = re.sub('(?m)^%s$' % re.escape(BLANKLINE_MARKER), '', want)
+ got = re.sub('(?m)^[ ]*(?=\n)', BLANKLINE_MARKER, got)
# Check if we should use diff. Don't use diff if the actual
# or expected outputs are too short, or if the expected output