comparison tests/run-tests.py @ 43819:e8a3bbffdc7d

tests: add test for Rust formatting

We enforce formatting for Python and C. It makes sense to do it
for Rust as well.

Since our rustfmt.toml relies on unstable rustfmt features, we
need to use a Nightly rustfmt with --unstable-features in order
for it to work. This is a bit hacky and I would prefer we remove
this requirement. But for now, this commit assumes this is the
way things must be and we go out of our way to detect and use the
rustfmt from the "nightly" toolchain, as installed via rustup.

We had to add some environment variables to the tests to make
the Rust binaries happy. Otherwise when running rustfmt we get
an error about no default toolchain being installed.

Differential Revision: https://phab.mercurial-scm.org/D7579

43818:ce088b38f92b

        # This has the same effect as Py_LegacyWindowsStdioFlag in exewrapper.c,
        # but this is needed for testing python instances like dummyssh,
        # dummysmtpd.py, and dumbhttp.py.
        if PYTHON3 and os.name == 'nt':
            env['PYTHONLEGACYWINDOWSSTDIO'] = '1'

        # Reset some environment variables to well-known values so that
        # the tests produce repeatable output.
        env['LANG'] = env['LC_ALL'] = env['LANGUAGE'] = 'C'
        env['TZ'] = 'GMT'

43819:e8a3bbffdc7d

        # This has the same effect as Py_LegacyWindowsStdioFlag in exewrapper.c,
        # but this is needed for testing python instances like dummyssh,
        # dummysmtpd.py, and dumbhttp.py.
        if PYTHON3 and os.name == 'nt':
            env['PYTHONLEGACYWINDOWSSTDIO'] = '1'

        # Modified HOME in test environment can confuse Rust tools. So set
        # CARGO_HOME and RUSTUP_HOME automatically if a Rust toolchain is
        # present and these variables aren't already defined.
        cargo_home_path = os.path.expanduser('~/.cargo')
        rustup_home_path = os.path.expanduser('~/.rustup')

        if os.path.exists(cargo_home_path) and b'CARGO_HOME' not in osenvironb:
            env['CARGO_HOME'] = cargo_home_path
        if (
            os.path.exists(rustup_home_path)
            and b'RUSTUP_HOME' not in osenvironb
        ):
            env['RUSTUP_HOME'] = rustup_home_path

        # Reset some environment variables to well-known values so that
        # the tests produce repeatable output.
        env['LANG'] = env['LC_ALL'] = env['LANGUAGE'] = 'C'
        env['TZ'] = 'GMT'