Prevent test failures when running under stretch-backports by checking the...

# along with diffoscope.  If not, see <https://www.gnu.org/licenses/>.

import pytest

import subprocess

from diffoscope.comparators.ocaml import OcamlInterfaceFile

from ..utils.data import load_fixture, get_data

from ..utils.tools import skip_unless_tools_exist

from ..utils.tools import skip_unless_tool_is_at_least

from ..utils.nonexisting import assert_non_existing

cmi1 = load_fixture('test1.cmi')

cmi2 = load_fixture('test2.cmi')

def ocaml_version():

    try:

        out = subprocess.check_output(['ocaml', '-version'])

    except subprocess.CalledProcessError as e:

        out = e.output

    return out.decode('utf-8').split()[-1]

def test_identification(cmi1):

    assert isinstance(cmi1, OcamlInterfaceFile)

    assert difference is None

@skip_unless_tools_exist('ocamlobjinfo')

@skip_unless_tool_is_at_least('ocamlobjinfo', ocaml_version, '4.05.0')

def test_diff(differences):

    expected_diff = get_data('ocaml_expected_diff')

    assert differences[0].unified_diff == expected_diff

@skip_unless_tools_exist('ocamlobjinfo')

@skip_unless_tool_is_at_least('ocamlobjinfo', ocaml_version, '4.05.0')

def test_compare_non_existing(monkeypatch, cmi1):

    assert_non_existing(monkeypatch, cmi1, has_null_source=False)