third_party.pylibs.pylint.src/tests/test_import_graph.py

# Copyright (c) 2006-2008, 2010, 2013 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2012 FELD Boris <lothiraldan@gmail.com>
# Copyright (c) 2014-2017 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2014 Google, Inc.
# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
# Copyright (c) 2016 Derek Gustafson <degustaf@gmail.com>
# Copyright (c) 2018 Reverb C <reverbc@users.noreply.github.com>

# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING

import os
from os.path import exists

import pytest

import pylint.testutils as testutils
from pylint.checkers import imports, initialize
from pylint.lint import PyLinter


@pytest.fixture
def dest():
    dest = "dependencies_graph.dot"
    yield dest
    os.remove(dest)


def test_dependencies_graph(dest):
    imports._dependencies_graph(dest, {"labas": ["hoho", "yep"], "hoho": ["yep"]})
    with open(dest) as stream:
        assert (
            stream.read().strip()
            == """
digraph "dependencies_graph" {
rankdir=LR
charset="utf-8"
URL="." node[shape="box"]
"hoho" [];
"yep" [];
"labas" [];
"yep" -> "hoho" [];
"hoho" -> "labas" [];
"yep" -> "labas" [];
}
""".strip()
        )


@pytest.fixture
def linter():
    l = PyLinter(reporter=testutils.TestReporter())
    initialize(l)
    return l


@pytest.fixture
def remove_files():
    yield
    for fname in ("import.dot", "ext_import.dot", "int_import.dot"):
        try:
            os.remove(fname)
        except:
            pass


@pytest.mark.usefixtures("remove_files")
def test_checker_dep_graphs(linter):
    l = linter
    l.global_set_option("persistent", False)
    l.global_set_option("reports", True)
    l.global_set_option("enable", "imports")
    l.global_set_option("import-graph", "import.dot")
    l.global_set_option("ext-import-graph", "ext_import.dot")
    l.global_set_option("int-import-graph", "int_import.dot")
    l.global_set_option("int-import-graph", "int_import.dot")
    # ignore this file causing spurious MemoryError w/ some python version (>=2.3?)
    l.global_set_option("ignore", ("func_unknown_encoding.py",))
    l.check("input")
    l.generate_reports()
    assert exists("import.dot")
    assert exists("ext_import.dot")
    assert exists("int_import.dot")