require 'test_helper'

module Byebug
  #
  # Tests undisplay command used to stop periodically displaying expressions.
  #
  class UndisplayTestCase < TestCase
    def program
      strip_line_numbers <<-EOC
        1:  module Byebug
        2:    d = 0
        3:
        4:    byebug
        5:
        6:    d += 3
        7:    d + 6
        8:  end
      EOC
    end

    def test_asks_for_confirmation
      enter 'display d', 'display d + 1', 'undisplay'
      debug_code(program) { clear_displays }

      check_output_includes 'Clear all expressions? (y/n)'
    end

    def test_removes_all_expressions_from_list_if_confirmed
      enter 'display d', 'display d + 1', 'undisplay', 'y', 'next'

      debug_code(program) do
        assert_equal [[false, 'd'], [false, 'd + 1']], Byebug.displays
        clear_displays
      end

      check_output_doesnt_include '1: d = 3', '2: d + 1 = 4'
    end

    def test_does_not_remove_all_expressions_from_list_unless_confirmed
      enter 'display d', 'display d + 1', 'undisplay', 'n', 'display'

      debug_code(program) do
        assert_equal [[true, 'd'], [true, 'd + 1']], Byebug.displays
        clear_displays
      end

      check_output_includes '1: d = 0', '2: d + 1 = 1'
    end

    def test_marks_specific_expression_from_list_as_inactive
      enter 'display d', 'display d + 1', 'undisplay 1'

      debug_code(program) do
        assert_equal [[nil, 'd'], [true, 'd + 1']], Byebug.displays
        clear_displays
      end
    end

    def test_displays_only_the_active_position
      enter 'display d', 'display d + 1', 'undisplay 1', 'next'
      debug_code(program) { clear_displays }

      check_output_includes '2: d + 1 = 4'
      check_output_doesnt_include '1: d = 3'
    end

    def test_disable_display_removes_the_expression_from_display_list
      enter 'display d', 'disable display 1'

      debug_code(program) do
        assert_equal [[false, 'd']], Byebug.displays
        clear_displays
      end
    end

    def test_disable_display_shows_an_error_if_no_displays_are_set
      enter 'disable display 1'
      debug_code(program)

      check_error_includes 'No display expressions have been set'
    end

    def test_disable_display_shows_an_error_if_theres_no_such_display_position
      enter 'display d', 'disable display 4'
      debug_code(program) { clear_displays }

      check_error_includes \
        '"disable display" argument "4" needs to be at most 1'
    end

    def test_enable_display_set_display_flag_to_true_in_display_list
      enter 'display d', 'disable display 1', 'enable display 1'

      debug_code(program) do
        assert_equal [[true, 'd']], Byebug.displays
        clear_displays
      end
    end
  end
end
