light_test.rb

require 'test_helper'

class LightTest < ActiveSupport::TestCase
  test 'arguments are valid' do
    assert_raises(ArgumentError) { Light.new(:pink, :unbroken, Arc.new(0, 90)) }
    assert_raises(ArgumentError) { Light.new(:white, :test, Arc.new(0, 90)) }
    assert_raises(ArgumentError) { Light.new(:white, :unbroken, 10) }
    assert_nothing_raised { Light.new(:white, :unbroken, Arc.new(0, 90)) }
  end

  test 'to_s' do
    masthead_light = Light.new(:white, :unbroken, Arc.new(360 - 112.5, 112.5))
    description = 'white unbroken light with arc 225.0 degrees from 247.5 to 112.5'
    assert_equal description, masthead_light.to_s
    flashing_light = Light.new(:yellow, :flashing, Arc.new(0, 0))
    description = 'yellow flashing light with arc 360 degrees from 0 to 0'
    assert_equal description, flashing_light.to_s
  end

  test 'visible?' do
    masthead_light = Light.new(:white, :unbroken, Arc.new(360 - 112.5, 112.5))
    assert masthead_light.visible?(90)
    refute masthead_light.visible?(160)
  end
end