@tdd_issue @tdd_issue_10371
Feature: TDD Issue #10371 — Block cursor navigation (alt+up/alt+down) not implemented in TUI

  This test captures bug #10371: the TUI application is missing ``alt+up``
  and ``alt+down`` key bindings for block cursor navigation.

  The scenario is tagged ``@tdd_expected_fail`` so the underlying assertion
  failure (confirming the bug exists) is inverted to a CI pass.  Once the
  fix for #10371 is merged, remove the ``@tdd_expected_fail`` tag from the
  scenario and this test will run normally as a regression guard.

  See CONTRIBUTING.md > Bug Fix Workflow > TDD Issue Test Tags.

  @tdd_expected_fail
  Scenario: TUI app BINDINGS includes alt+up and alt+down for block cursor navigation
    Given the TUI app module is imported with mocked Textual
    When I inspect the TUI app BINDINGS for block cursor navigation
    Then the BINDINGS should include "alt+up" key binding
    And the BINDINGS should include "alt+down" key binding
