py3: add a b'' prefix in tests/test-convert-identity.t

Differential Revision: https://phab.mercurial-scm.org/D6662

tests/test-convert-identity.t

@@ -1,40 +1,40 b''
 Testing that convert.hg.preserve-hash=true can be used to make hg
 convert from hg repo to hg repo preserve hashes, even if the
 computation of the files list in commits change slightly between hg
 versions.
 
   $ cat <<'EOF' >> "$HGRCPATH"
   > [extensions]
   > convert =
   > EOF
   $ cat <<'EOF' > changefileslist.py
   > from mercurial import (changelog, extensions)
   > def wrap(orig, clog, manifest, files, *args, **kwargs):
-  >   return orig(clog, manifest, ["a"], *args, **kwargs)
+  >   return orig(clog, manifest, [b"a"], *args, **kwargs)
   > def extsetup(ui):
   >   extensions.wrapfunction(changelog.changelog, 'add', wrap)
   > EOF
 
   $ hg init repo
   $ cd repo
   $ echo a > a; hg commit -qAm a
   $ echo b > a; hg commit -qAm b
   $ hg up -qr 0; echo c > c; hg commit -qAm c
   $ hg merge -qr 1
   $ hg commit -m_ --config extensions.x=../changefileslist.py
   $ hg log -r . -T '{node|short} {files|json}\n'
   c085bbe93d59 ["a"]
 
 Now that we have a commit with a files list that's not what the
 current hg version would create, check that convert either fixes it or
 keeps it depending on config:
 
   $ hg convert -q . ../convert
   $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'
   b7c4d4bbacd3 []
   $ rm -rf ../convert
 
   $ hg convert -q . ../convert --config convert.hg.preserve-hash=true
   $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'
   c085bbe93d59 ["a"]
   $ rm -rf ../convert