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9 changes: 9 additions & 0 deletions toolz/tests/test_dicttoolz.py
Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
from collections import defaultdict as _defaultdict
import os
from toolz.dicttoolz import (merge, merge_with, valmap, keymap, update_in,
assoc, dissoc, keyfilter, valfilter, itemmap,
itemfilter, assoc_in)
from toolz.functoolz import identity
from toolz.utils import raises
from toolz.compatibility import PY3

Expand Down Expand Up @@ -250,3 +252,10 @@ class TestCustomMapping(TestDict):
"""
D = CustomMapping
kw = {'factory': lambda: CustomMapping()}


def test_environ():
# See: https://github.com/pytoolz/cytoolz/issues/127
assert keymap(identity, os.environ) == os.environ
assert valmap(identity, os.environ) == os.environ
assert itemmap(identity, os.environ) == os.environ