fix: harden legacy/tui3 non-tty flows and shutdown stability

src/tests/test_password_prompt.py

@@ -28,6 +28,16 @@ def test_prompt_existing_password(monkeypatch):
     assert password_prompt.prompt_existing_password() == "mypassword"
 
 
+def test_prompt_existing_password_non_tty(monkeypatch):
+    monkeypatch.setattr(
+        password_prompt,
+        "masked_input",
+        lambda _prompt: (_ for _ in ()).throw(EOFError("no tty")),
+    )
+    with pytest.raises(password_prompt.PasswordPromptError, match="requires a TTY"):
+        password_prompt.prompt_existing_password()
+
+
 def test_confirm_action_yes_no(monkeypatch):
     monkeypatch.setattr(builtins, "input", lambda _: "Y")
     assert password_prompt.confirm_action()

src/tests/test_seed_prompt.py

@@ -5,6 +5,7 @@ from utils import seed_prompt
 
 def test_masked_input_posix_backspace(monkeypatch, capsys):
     seq = iter(["a", "b", "\x7f", "c", "\n"])
+    monkeypatch.setattr(seed_prompt.sys.stdin, "isatty", lambda: True)
     monkeypatch.setattr(seed_prompt.sys.stdin, "read", lambda n=1: next(seq))
     monkeypatch.setattr(seed_prompt.sys.stdin, "fileno", lambda: 0)
 
@@ -36,6 +37,7 @@ def test_masked_input_posix_backspace(monkeypatch, capsys):
 
 def test_masked_input_windows_space(monkeypatch, capsys):
     seq = iter(["x", "y", " ", "z", "\r"])
+    monkeypatch.setattr(seed_prompt.sys.stdin, "isatty", lambda: True)
     fake_msvcrt = types.SimpleNamespace(getwch=lambda: next(seq))
     monkeypatch.setattr(seed_prompt, "msvcrt", fake_msvcrt)
     monkeypatch.setattr(seed_prompt.sys, "platform", "win32", raising=False)
@@ -49,6 +51,7 @@ def test_masked_input_windows_space(monkeypatch, capsys):
 
 def test_masked_input_posix_ctrl_c(monkeypatch):
     seq = iter(["\x03"])
+    monkeypatch.setattr(seed_prompt.sys.stdin, "isatty", lambda: True)
     monkeypatch.setattr(seed_prompt.sys.stdin, "read", lambda n=1: next(seq))
     monkeypatch.setattr(seed_prompt.sys.stdin, "fileno", lambda: 0)
 
@@ -70,6 +73,7 @@ def test_masked_input_posix_ctrl_c(monkeypatch):
 
 def test_masked_input_windows_ctrl_c(monkeypatch):
     seq = iter(["\x03"])
+    monkeypatch.setattr(seed_prompt.sys.stdin, "isatty", lambda: True)
     fake_msvcrt = types.SimpleNamespace(getwch=lambda: next(seq))
     monkeypatch.setattr(seed_prompt, "msvcrt", fake_msvcrt)
     monkeypatch.setattr(seed_prompt.sys, "platform", "win32", raising=False)
@@ -93,6 +97,12 @@ def test_prompt_seed_words_valid(monkeypatch):
     assert result == phrase
 
 
+def test_masked_input_requires_tty(monkeypatch):
+    monkeypatch.setattr(seed_prompt.sys.stdin, "isatty", lambda: False)
+    with pytest.raises(EOFError, match="requires a TTY"):
+        seed_prompt.masked_input("Enter: ")
+
+
 def test_prompt_seed_words_invalid_word(monkeypatch):
     from mnemonic import Mnemonic
 

src/tests/test_typer_cli.py

@@ -1092,6 +1092,18 @@ def test_tui2_check(monkeypatch):
     assert payload["textual_available"] is True
 
 
+def test_tui3_check(monkeypatch):
+    monkeypatch.setattr(
+        cli,
+        "check_tui2_runtime",
+        lambda: {"status": "ok", "backend": "textual", "textual_available": True},
+    )
+    result = runner.invoke(app, ["tui3", "--check"])
+    assert result.exit_code == 0
+    payload = json.loads(result.stdout)
+    assert "textual_available" in payload
+
+
 def test_tui2_unavailable_without_fallback(monkeypatch):
     monkeypatch.setattr(cli, "_get_entry_service", lambda _ctx: object())
     monkeypatch.setattr(cli, "launch_tui2", lambda **_: False)