index: add a `has_node` method (API)
The new `index.has_node(node)` is to be preferred over:
`node in index.nodemap`.
This get us closer to be able to remove the `nodemap` attribute of the index.
Differential Revision: https://phab.mercurial-scm.org/D7322
# Balto (https://bitbucket.org/lothiraldan/balto/src) is a test orchestrator
# which is compatible with all test runner that can emit the LITF
# (https://github.com/lothiraldan/litf) test format.
# The plugin for the Mercurial test runner is mercurial-litf
# (https://pypi.org/project/mercurial-litf/). Make sure to follow the
# instruction and configuration instructions here:
# https://bitbucket.org/lothiraldan/mercurial_litf/src/default/
# You can launch Balto with `balto /path/to/mercurial/tests/`
name = "Mercurial Test Suite"
tool = "mercurial"