tests/heredoctest.py

tests: explicitly define compression engines for tests

The zstd compression engine requires C extensions and isn't present
in pure Python builds.

The compression engine list leaks into the server capabilities string.

Unless we're testing functionality specific to a compression format,
the set of compression formats supported by a server doesn't matter
much.

So this commit explicitly defines the server's compression engines for
some tests so behavior is consistent between pure and non-pure builds.

Differential Revision: https://phab.mercurial-scm.org/D3431

from __future__ import absolute_import, print_function

import sys

globalvars = {}
lines = sys.stdin.readlines()
while lines:
    l = lines.pop(0)
    if l.startswith('SALT'):
        print(l[:-1])
    elif l.startswith('>>> '):
        snippet = l[4:]
        while lines and lines[0].startswith('... '):
            l = lines.pop(0)
            snippet += l[4:]
        c = compile(snippet, '<heredoc>', 'single')
        try:
            exec(c, globalvars)
        except Exception as inst:
            print(repr(inst))