X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/10d8976a79f5a7f7e5e36369a81d9e5c983332d1..d1e0d79e38db934a65dded44b903f05ab85829b4:/tests/test_black.py

diff --git a/tests/test_black.py b/tests/test_black.py
index 225ece6..7dba611 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -89,7 +89,7 @@ class BlackTestCase(unittest.TestCase):
         try:
             sys.stdin, sys.stdout = StringIO(source), StringIO()
             sys.stdin.name = '<stdin>'
-            black.format_stdin_to_stdout(line_length=ll, fast=True)
+            black.format_stdin_to_stdout(line_length=ll, fast=True, write_back=True)
             sys.stdout.seek(0)
             actual = sys.stdout.read()
         finally:
@@ -171,6 +171,14 @@ class BlackTestCase(unittest.TestCase):
         black.assert_equivalent(source, actual)
         black.assert_stable(source, actual, line_length=ll)
 
+    @patch("black.dump_to_file", dump_to_stderr)
+    def test_empty_lines(self) -> None:
+        source, expected = read_data('empty_lines')
+        actual = fs(source)
+        self.assertFormatEqual(expected, actual)
+        black.assert_equivalent(source, actual)
+        black.assert_stable(source, actual, line_length=ll)
+
     def test_report(self) -> None:
         report = black.Report()
         out_lines = []