Test to ensure NullFile set as Console.file when stdout null

tests/test_console.py

@@ -9,6 +9,7 @@ from unittest import mock
 import pytest
 
 from rich import errors
+from rich._null_file import NullFile
 from rich.color import ColorSystem
 from rich.console import (
     CaptureError,
@@ -238,6 +239,15 @@ def test_print_json_indent_none():
     assert result == expected
 
 
+def test_console_null_file(monkeypatch):
+    # When stdout and stderr are null, Console.file should be replaced with NullFile
+    monkeypatch.setattr("sys.stdout", None)
+    monkeypatch.setattr("sys.stderr", None)
+
+    console = Console()
+    assert isinstance(console.file, NullFile)
+
+
 def test_log():
     console = Console(
         file=io.StringIO(),