test: add shared input/password fixture

tests/conftest.py

@@ -0,0 +1,16 @@
+from typing import Iterable, Callable
+
+import pytest
+
+
+@pytest.fixture
+def user_input(monkeypatch) -> Callable[[Iterable[str], Iterable[str]], None]:
+    def _set(inputs: Iterable[str], passwords: Iterable[str]) -> None:
+        input_iter = iter(inputs)
+        password_iter = iter(passwords)
+
+        monkeypatch.setattr("builtins.input", lambda _prompt: next(input_iter))
+        monkeypatch.setattr("getpass.getpass",
+                            lambda _prompt: next(password_iter))
+
+    return _set