"""Tests for IPython.utils.importstring."""

# -----------------------------------------------------------------------------

# Copyright (C) 2013 The IPython Development Team

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

# -----------------------------------------------------------------------------

import os

import os.path

import sys

import pytest

from IPython.utils.importstring import import_item

# -----------------------------------------------------------------------------

# Tests

# -----------------------------------------------------------------------------

def test_import_plain():

os2 = import_item("os")

assert os is os2

def test_import_nested():

path2 = import_item("os.path")

assert os.path is path2

def test_import_raises():

pytest.raises(ImportError, import_item, "IPython.foobar")

@pytest.mark.parametrize("name,expected", [

("os", os),

("sys", sys),

("os.path", os.path),

])

def test_import_returns_correct_object(name, expected):

assert import_item(name) is expected

@pytest.mark.parametrize("bad_name", [

"IPython.nonexistent_module",

"completely.fake.module",

"os.nonexistent_attribute",

])

def test_import_invalid_raises_importerror(bad_name):

with pytest.raises(ImportError):

import_item(bad_name)

def test_import_deep_nested():

from collections import abc

result = import_item("collections.abc")

assert result is abc

def test_import_result_is_callable_for_functions():

result = import_item("os.path.join")

assert callable(result)

assert result("a", "b") == os.path.join("a", "b")