Feature: TUI Shell Exec Coverage
  Scenarios that exercise previously uncovered code paths
  in the tui/input/shell_exec module (lines 48-49, 52-56, 61, 77-82).

  Background:
    Given the shell_exec module is imported

  Scenario: Empty command returns error result
    When I run a shell command with an empty string
    Then the shell result exit code should be 2
    And the shell result stderr should be "empty command"
    And the shell result stdout should be empty

  Scenario: Whitespace-only command returns error result
    When I run a shell command with only whitespace "   "
    Then the shell result exit code should be 2
    And the shell result stderr should be "empty command"

  Scenario: Shell mode disabled via env var set to 1
    Given the environment variable CLEVERAGENTS_DISABLE_SHELL_MODE is set to "1"
    When I run a shell command "echo hello"
    Then the shell result exit code should be 2
    And the shell result stderr should be "shell mode is disabled"

  Scenario: Shell mode disabled via env var set to true
    Given the environment variable CLEVERAGENTS_DISABLE_SHELL_MODE is set to "true"
    When I run a shell command "echo hello"
    Then the shell result exit code should be 2
    And the shell result stderr should be "shell mode is disabled"

  Scenario: Dangerous command confirmed via callback proceeds to execution
    Given a confirm_dangerous callback that returns True
    When I run a dangerous command "rm -rf /" with the callback
    Then the dangerous command should have been confirmed
    And the shell result should reflect the executed command

  Scenario: Dangerous command confirmed but callback returns False is still blocked
    Given a confirm_dangerous callback that returns False
    When I run a dangerous command "rm -rf /" with the callback
    Then the shell result exit code should be 1
    And the shell result stderr should be "blocked by shell safety policy"

  Scenario: Command that exceeds timeout returns timeout result
    Given subprocess run is mocked to raise TimeoutExpired
    When I run a shell command "sleep 999" with a 1 second timeout
    Then the shell result exit code should be 124
    And the shell result stderr should contain "command timed out after"