tests: add `revlogutils.deltas` module to doctests

The doctest in these module have been from `mercurial.revlog` but the module was
not added to the doctests.

Spotted by Yuya Nishihara.

tests/test-doctest.py

@@ -1,83 +1,84 b''
 # this is hack to make sure no escape characters are inserted into the output
 
 from __future__ import absolute_import
 
 import doctest
 import os
 import re
 import sys
 
 ispy3 = (sys.version_info[0] >= 3)
 
 if 'TERM' in os.environ:
     del os.environ['TERM']
 
 class py3docchecker(doctest.OutputChecker):
     def check_output(self, want, got, optionflags):
         want2 = re.sub(r'''\bu(['"])(.*?)\1''', r'\1\2\1', want)  # py2: u''
         got2 = re.sub(r'''\bb(['"])(.*?)\1''', r'\1\2\1', got)  # py3: b''
         # py3: <exc.name>: b'<msg>' -> <name>: <msg>
         #      <exc.name>: <others> -> <name>: <others>
         got2 = re.sub(r'''^mercurial\.\w+\.(\w+): (['"])(.*?)\2''', r'\1: \3',
                       got2, re.MULTILINE)
         got2 = re.sub(r'^mercurial\.\w+\.(\w+): ', r'\1: ', got2, re.MULTILINE)
         return any(doctest.OutputChecker.check_output(self, w, g, optionflags)
                    for w, g in [(want, got), (want2, got2)])
 
 def testmod(name, optionflags=0, testtarget=None):
     __import__(name)
     mod = sys.modules[name]
     if testtarget is not None:
         mod = getattr(mod, testtarget)
 
     # minimal copy of doctest.testmod()
     finder = doctest.DocTestFinder()
     checker = None
     if ispy3:
         checker = py3docchecker()
     runner = doctest.DocTestRunner(checker=checker, optionflags=optionflags)
     for test in finder.find(mod, name):
         runner.run(test)
     runner.summarize()
 
 testmod('mercurial.changegroup')
 testmod('mercurial.changelog')
 testmod('mercurial.cmdutil')
 testmod('mercurial.color')
 testmod('mercurial.config')
 testmod('mercurial.context')
 testmod('mercurial.dagparser', optionflags=doctest.NORMALIZE_WHITESPACE)
 testmod('mercurial.dispatch')
 testmod('mercurial.encoding')
 testmod('mercurial.fancyopts')
 testmod('mercurial.formatter')
 testmod('mercurial.hg')
 testmod('mercurial.hgweb.hgwebdir_mod')
 testmod('mercurial.match')
 testmod('mercurial.mdiff')
 testmod('mercurial.minirst')
 testmod('mercurial.patch')
 testmod('mercurial.pathutil')
 testmod('mercurial.parser')
 testmod('mercurial.pycompat')
 testmod('mercurial.revlog')
+testmod('mercurial.revlogutils.deltas')
 testmod('mercurial.revsetlang')
 testmod('mercurial.smartset')
 testmod('mercurial.store')
 testmod('mercurial.subrepo')
 testmod('mercurial.templatefilters')
 testmod('mercurial.templater')
 testmod('mercurial.ui')
 testmod('mercurial.url')
 testmod('mercurial.util')
 testmod('mercurial.util', testtarget='platform')
 testmod('mercurial.utils.stringutil')
 testmod('hgext.convert.convcmd')
 testmod('hgext.convert.cvsps')
 testmod('hgext.convert.filemap')
 testmod('hgext.convert.p4')
 testmod('hgext.convert.subversion')
 testmod('hgext.fix')
 testmod('hgext.mq')
 # Helper scripts in tests/ that have doctests:
 testmod('drawdag')