tests: fix error case in test-url.py's doctest
This required some careful attention, so I wanted to split it out from
the uninteresting bits that'll be in the next change.
Differential Revision: https://phab.mercurial-scm.org/D3469
BasedOnStyle: LLVM
IndentWidth: 8
UseTab: ForIndentation
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AllowShortBlocksOnASingleLine: false
AllowShortFunctionsOnASingleLine: false
IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2