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Fix patching of io.TextWrapper in tests #2489

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akaihola wants to merge 3 commits into from
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Fix patching of io.TextWrapper in tests #2489

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9a1897c
Fix patching of `io.TextWrapper` in tests
Sep 10, 2021
c068ec3
Update change log
Sep 10, 2021
a99ad3a
Update CHANGES.md
akaihola Sep 11, 2021
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4 changes: 4 additions & 0 deletions CHANGES.md
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,10 @@
- Fix missing modules in self-contained binaries (#2466)
- Fix missing toml extra used during installation (#2475)

### Tests

- Fix patching of `io.TextWrapper` (#2489)

## 21.8b0

### _Black_
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6 changes: 4 additions & 2 deletions tests/test_black.py
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Expand Up @@ -25,7 +25,7 @@
)
import pytest
import unittest
from unittest.mock import patch, MagicMock
from unittest.mock import patch, MagicMock, Mock
from parameterized import parameterized

import click
Expand Down Expand Up @@ -1689,7 +1689,9 @@ def test_reformat_one_with_stdin_and_existing_path(self) -> None:

def test_reformat_one_with_stdin_empty(self) -> None:
output = io.StringIO()
with patch("io.TextIOWrapper", lambda *args, **kwargs: output):
mock_io = Mock()
mock_io.TextIOWrapper.return_value = output
with patch.object(black, "io", mock_io):
try:
black.format_stdin_to_stdout(
fast=True,
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