path: root/test/unittest_checker_python3.py

# Copyright 2014 Google Inc.
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""Tests for the python3 checkers."""
from __future__ import absolute_import

import sys
import unittest

from astroid import test_utils

from pylint import testutils
from pylint.checkers import python3 as checker


def python2_only(test):
    """Decorator for any tests that will fail under Python 3."""
    return unittest.skipIf(sys.version_info[0] > 2, 'Python 2 only')(test)


class Python3CheckerTest(testutils.CheckerTestCase):

    CHECKER_CLASS = checker.Python3Checker

    def check_bad_builtin(self, builtin_name):
        node = test_utils.extract_node(builtin_name + '  #@')
        message = builtin_name.lower() + '-builtin'
        with self.assertAddsMessages(testutils.Message(message, node=node)):
            self.checker.visit_name(node)

    @python2_only
    def test_apply_builtin(self):
        self.check_bad_builtin('apply')

    @python2_only
    def test_buffer_builtin(self):
        self.check_bad_builtin('buffer')

    @python2_only
    def test_cmp_builtin(self):
        self.check_bad_builtin('cmp')

    @python2_only
    def test_coerce_builtin(self):
        self.check_bad_builtin('coerce')

    @python2_only
    def test_execfile_builtin(self):
        self.check_bad_builtin('execfile')

    @python2_only
    def test_file_builtin(self):
        self.check_bad_builtin('file')

    @python2_only
    def test_long_builtin(self):
        self.check_bad_builtin('long')

    @python2_only
    def test_raw_input_builtin(self):
        self.check_bad_builtin('raw_input')

    @python2_only
    def test_reduce_builtin(self):
        self.check_bad_builtin('reduce')

    @python2_only
    def test_StandardError_builtin(self):
        self.check_bad_builtin('StandardError')

    @python2_only
    def test_unicode_builtin(self):
        self.check_bad_builtin('unicode')

    @python2_only
    def test_xrange_builtin(self):
        self.check_bad_builtin('xrange')

    def test_delslice_method(self):
        node = test_utils.extract_node("""
            class Foo(object):
                def __delslice__(self, i, j):  #@
                    pass""")
        message = testutils.Message('delslice-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_function(node)

    def test_getslice_method(self):
        node = test_utils.extract_node("""
            class Foo(object):
                def __getslice__(self, i, j):  #@
                    pass""")
        message = testutils.Message('getslice-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_function(node)

    def test_setslice_method(self):
        node = test_utils.extract_node("""
            class Foo(object):
                def __setslice__(self, i, j, value):  #@
                    pass""")
        message = testutils.Message('setslice-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_function(node)

    def test_coerce_method(self):
        node = test_utils.extract_node("""
            class Foo(object):
                def __coerce__(self, other):  #@
                    pass""")
        message = testutils.Message('coerce-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_function(node)

    @python2_only
    def test_print_statement(self):
        node = test_utils.extract_node('print "Hello, World!" #@')
        message = testutils.Message('print-statement', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_print(node)

    def test_relative_import(self):
        node = test_utils.extract_node('import string  #@')
        message = testutils.Message('no-absolute-import', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_import(node)

    def test_relative_from_import(self):
        node = test_utils.extract_node('from os import path  #@')
        message = testutils.Message('no-absolute-import', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_import(node)

    def test_absolute_import(self):
        module_import = test_utils.build_module(
                'from __future__ import absolute_import; import os')
        module_from = test_utils.build_module(
                'from __future__ import absolute_import; from os import path')
        with self.assertNoMessages():
            for module in (module_import, module_from):
                self.walk(module)

    def test_division(self):
        node = test_utils.extract_node('3 / 2  #@')
        message = testutils.Message('old-division', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_binop(node)

    def test_division_with_future_statement(self):
        module = test_utils.build_module('from __future__ import division; 3 / 2')
        with self.assertNoMessages():
            self.walk(module)

    def test_floor_division(self):
        node = test_utils.extract_node(' 3 // 2  #@')
        with self.assertNoMessages():
            self.checker.visit_binop(node)

    def test_division_by_float(self):
        left_node = test_utils.extract_node('3.0 / 2 #@')
        right_node = test_utils.extract_node(' 3 / 2.0  #@')
        with self.assertNoMessages():
            for node in (left_node, right_node):
                self.checker.visit_binop(node)

    def test_dict_iter_method(self):
        for meth in ('keys', 'values', 'items'):
            node = test_utils.extract_node('x.iter%s()  #@' % meth)
            message = testutils.Message('dict-iter-method', node=node)
            with self.assertAddsMessages(message):
                self.checker.visit_callfunc(node)

    def test_dict_iter_method_on_dict(self):
        node = test_utils.extract_node('{}.iterkeys()')
        message = testutils.Message('dict-iter-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_callfunc(node)

    def test_dict_not_iter_method(self):
        arg_node = test_utils.extract_node('x.iterkeys(x)  #@')
        stararg_node = test_utils.extract_node('x.iterkeys(*x)  #@')
        kwarg_node = test_utils.extract_node('x.iterkeys(y=x)  #@')
        non_dict_node = test_utils.extract_node('x=[]\nx.iterkeys() #@')
        with self.assertNoMessages():
            for node in (arg_node, stararg_node, kwarg_node, non_dict_node):
                self.checker.visit_callfunc(node)

    def test_dict_view_method(self):
        for meth in ('keys', 'values', 'items'):
            node = test_utils.extract_node('x.view%s()  #@' % meth)
            message = testutils.Message('dict-view-method', node=node)
            with self.assertAddsMessages(message):
                self.checker.visit_callfunc(node)

    def test_dict_view_method_on_dict(self):
        node = test_utils.extract_node('{}.viewkeys()')
        message = testutils.Message('dict-view-method', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_callfunc(node)

    def test_dict_not_view_method(self):
        arg_node = test_utils.extract_node('x.viewkeys(x)  #@')
        stararg_node = test_utils.extract_node('x.viewkeys(*x)  #@')
        kwarg_node = test_utils.extract_node('x.viewkeys(y=x)  #@')
        non_dict_node = test_utils.extract_node('x=[]\nx.viewkeys() #@')
        with self.assertNoMessages():
            for node in (arg_node, stararg_node, kwarg_node, non_dict_node):
                self.checker.visit_callfunc(node)

    def test_next_method(self):
        node = test_utils.extract_node('x.next()  #@')
        message = testutils.Message('next-method-called', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_callfunc(node)

    def test_not_next_method(self):
        arg_node = test_utils.extract_node('x.next(x)  #@')
        stararg_node = test_utils.extract_node('x.next(*x)  #@')
        kwarg_node = test_utils.extract_node('x.next(y=x)  #@')
        with self.assertNoMessages():
            for node in (arg_node, stararg_node, kwarg_node):
                self.checker.visit_callfunc(node)

    def test_metaclass_assignment(self):
        node = test_utils.extract_node("""
            class Foo(object):  #@
                __metaclass__ = type""")
        message = testutils.Message('metaclass-assignment', node=node)
        with self.assertAddsMessages(message):
            self.checker.visit_class(node)

    def test_metaclass_global_assignment(self):
        module = test_utils.build_module('__metaclass__ = type')
        with self.assertNoMessages():
            self.walk(module)

    @python2_only
    def test_parameter_unpacking(self):
        node = test_utils.extract_node('def func((a, b)):#@\n pass')
        arg = node.args.args[0]
        with self.assertAddsMessages(testutils.Message('parameter-unpacking', node=arg)):
            self.walk(node)


if __name__ == '__main__':
    unittest.main()