diff --git a/src/darker/tests/test_command_line.py b/src/darker/tests/test_command_line.py
index 1255b0cfd..8cc68e831 100644
--- a/src/darker/tests/test_command_line.py
+++ b/src/darker/tests/test_command_line.py
@@ -17,7 +17,7 @@
 from darker.__main__ import main
 from darker.command_line import make_argument_parser, parse_command_line
 from darker.config import Exclusions
-from darker.formatters import black_formatter, ruff_formatter
+from darker.formatters import ruff_formatter
 from darker.formatters.black_formatter import BlackFormatter
 from darker.tests.helpers import flynt_present, isort_present
 from darkgraylib.config import ConfigurationError
diff --git a/src/darker/tests/test_formatters_black_compatible.py b/src/darker/tests/test_formatters_black_compatible.py
index 006e0261a..69ea925e7 100644
--- a/src/darker/tests/test_formatters_black_compatible.py
+++ b/src/darker/tests/test_formatters_black_compatible.py
@@ -8,7 +8,7 @@
 
 import pytest
 
-from darker.formatters import black_formatter, ruff_formatter
+from darker.formatters import ruff_formatter
 from darker.formatters.black_formatter import BlackFormatter
 from darker.formatters.ruff_formatter import RuffFormatter
 from darkgraylib.testtools.helpers import raises_or_matches
@@ -82,16 +82,16 @@ def test_run(formatter_class, encoding, newline):
 @pytest.mark.parametrize(
     "formatter_setup",
     [
-        (BlackFormatter, black_formatter, "format_str"),
-        (RuffFormatter, ruff_formatter, "_ruff_format_stdin"),
+        (BlackFormatter, "black.format_str"),
+        (RuffFormatter, "darker.formatters.ruff_formatter._ruff_format_stdin"),
     ],
 )
 @pytest.mark.parametrize("newline", ["\n", "\r\n"])
 def test_run_always_uses_unix_newlines(formatter_setup, newline):
     """Content is always passed to Black and Ruff with Unix newlines."""
-    formatter_class, formatter_module, formatter_func_name = formatter_setup
+    formatter_class, formatter_func_name = formatter_setup
     src = TextDocument.from_str(f"print ( 'touché' ){newline}")
-    with patch.object(formatter_module, formatter_func_name) as formatter_func:
+    with patch(formatter_func_name) as formatter_func:
         formatter_func.return_value = 'print("touché")\n'
 
         _ = formatter_class().run(src, Path("a.py"))