X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/be16cfa0353f33adf0ee5f026d9b46f9ca6ac7ac..548d6991610ae547b34e6c3058fc8299c9b25658:/tests/test_black.py

diff --git a/tests/test_black.py b/tests/test_black.py
index 5262c0e..42ac119 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -6,6 +6,7 @@ from concurrent.futures import ThreadPoolExecutor
 from contextlib import contextmanager
 from dataclasses import replace
 import inspect
+import io
 from io import BytesIO
 import os
 from pathlib import Path
@@ -1682,6 +1683,20 @@ class BlackTestCase(BlackBaseTestCase):
             # __BLACK_STDIN_FILENAME__ should have been stripped
             report.done.assert_called_with(expected, black.Changed.YES)
 
+    def test_reformat_one_with_stdin_empty(self) -> None:
+        output = io.StringIO()
+        with patch("io.TextIOWrapper", lambda *args, **kwargs: output):
+            try:
+                black.format_stdin_to_stdout(
+                    fast=True,
+                    content="",
+                    write_back=black.WriteBack.YES,
+                    mode=DEFAULT_MODE,
+                )
+            except io.UnsupportedOperation:
+                pass  # StringIO does not support detach
+            assert output.getvalue() == ""
+
     def test_gitignore_exclude(self) -> None:
         path = THIS_DIR / "data" / "include_exclude_tests"
         include = re.compile(r"\.pyi?$")