Wine Glass Homework 1

wine_glass.rb

class WineGlass
	attr_accessor :material, :volume, :stem_length, :wine_volume
	def pretty_print_material
		"Happy Dance Party : #{material}"
	end
	def pretty_print_stuff
		"This wine glass is cool. It has a stem length of #{stem_length} and a volume of #{volume}ml"
	end	
	def pretty_print_everything
		"My #{material} wine glass, that has a stem length of #{stem_length}, is cool because it holds #{volume}ml"
	end
	def pretty_print_precise
		"Needs More Wine :#{(wine_volume / volume) * 100}"
	end
end

require 'minitest/autorun'

class TestWineGlass < MiniTest::Unit::TestCase

	def setup
	@wg = WineGlass.new
                @wg.material = 'wood'
                @wg.volume = 650
                @wg.stem_length = 5
                @wg.wine_volume = 65
           
	end

	def test_that_wine_glasses_have_volume
		assert_respond_to @wg, :volume
	end

	def test_that_wg_has_a_pretty_print_for_material
		@wg.material= 'wood'
		assert_equal "Happy Dance Party : #{@wg.material}", @wg.pretty_print_material
	end

	def test_wg_pretty_prints_stem_length_and_volume
		@wg.volume = 650
		@wg.stem_length = 5
		assert_equal "This wine glass is cool. It has a stem length of 5 and a volume of 650ml", @wg.pretty_print_stuff
	end

	def test_that_wg_has_everything
		assert_equal "My wood wine glass, that has a stem length of 5, is cool because it holds 650ml", @wg.pretty_print_everything
		
	end
	def test_that_wg_needs_more_wine
		@wg.volume= 650
		@wg.wine_volume= 65
		assert_equal "Needs More Wine :#{(@wg.wine_volume/ @wg.volume) * 100}", @wg.pretty_print_precise
	end
end

I'm stuck on this part with the following error message:

1. Error:
   test_that_wg_needs_more_wine(TestWineGlass):
   NameError: undefined local variable or method wine_volume' for #<TestWineGlass:0x000001008e6a10> wine_glass.rb:89:intest_that_wg_needs_more_wine'

5 tests, 4 assertions, 0 failures, 1 errors, 0 skips
mary-ann-valentines-macbook-pro-7:~ maryannvalentine$

Ok-I worked on it a little more, but I'm not seeing what I need to fix. Ideas?

1. Failure:
   test_that_wg_needs_more_wine(TestWineGlass) [wine_glass.rb:89]:
   --- expected
   +++ actual
   @@ -1 +1 @@
   -"Needs More Wine : (@wg.wine_volume/ @wg.volume) * 100"
   +"Needs More Wine : (65 / 650 * 100)"

5 tests, 5 assertions, 1 failures, 0 errors, 0 skips
mary-ann-valentines-macbook-pro-7:~ maryannvalentine$

and now...

1. Failure:
   test_that_wg_needs_more_wine(TestWineGlass) [wine_glass.rb:89]:
   --- expected
   +++ actual
   @@ -1 +1 @@
   -"Needs More Wine : (@wg.wine_volume/ @wg.volume * 100)"
   +"Needs More Wine : (0)"

5 tests, 5 assertions, 1 failures, 0 errors, 0 skips
mary-ann-valentines-macbook-pro-7:~ maryannvalentine$

yay! fixed it!
Run options: --seed 59338

Running tests:

.....

Finished tests in 0.000741s, 6747.6383 tests/s, 6747.6383 assertions/s.

5 tests, 5 assertions, 0 failures, 0 errors, 0 skips
mary-ann-valentines-macbook-pro-7:~ maryannvalentine$