Merge lp:~cjwatson/lazr.restful/fix-py3-pretty-print-helpers into lp:lazr.restful

[Colin Watson]

Fix pformat_value to apply more escaping to Unicode values.

Otherwise it wasn't enough like repr() as promised by the docstring: for example, '\n' was rendered as a literal newline.

Noticed by the Launchpad test suite when attempting to upgrade lazr.restful to the pretty-printing changes (https://code.launchpad.net/~cjwatson/lazr.restful/py3-pretty-print-helpers/+merge/390200).

[Thiago F. Pappacena (pappacena)]

LGTM

review: Approve

=== modified file 'src/lazr/restful/testing/webservice.py'
--- src/lazr/restful/testing/webservice.py	2020-09-07 16:41:27 +0000
+++ src/lazr/restful/testing/webservice.py	2020-09-28 09:03:19 +0000
@@ -184,6 +184,7 @@
     ambiguity.
     """
     if isinstance(value, six.text_type):
+        value = value.encode('unicode_escape').decode('ASCII')
         if "'" in value and '"' not in value:
             return '"%s"' % value
         else: