fix(console): write UTF-8 to redirected streams on Windows

tests/core/test_main_banner.py

@@ -2,12 +2,16 @@
 
 from __future__ import annotations
 
+import io
+import sys
+
 import pytest
 from click.testing import CliRunner
 
 from unshackle.core import __version__
-from unshackle.core.__main__ import main
+from unshackle.core.__main__ import main, print_banner
 from unshackle.core.config import config
+from unshackle.core.console import force_utf8_streams
 
 
 @pytest.mark.parametrize("args", [["--help"], ["env", "--help"]])
@@ -19,3 +23,13 @@ def test_help_prints_the_banner_once(monkeypatch: pytest.MonkeyPatch, args: list
     assert result.exit_code == 0, result.output
     assert result.output.count(f"v {__version__}") == 1
     assert "Usage:" in result.output
+
+
+def test_banner_prints_to_a_legacy_code_page_stream(monkeypatch: pytest.MonkeyPatch) -> None:
+    buffer = io.BytesIO()
+    monkeypatch.setattr(sys, "stdout", io.TextIOWrapper(buffer, encoding="cp1252"))
+
+    force_utf8_streams()
+    print_banner()
+
+    assert "▄".encode() in buffer.getvalue()