Add objects and methods exercise

objects-and-methods/README.md

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+# Objects and Methods
+
+## Exercise 1
+
+If you'd like to be walked through the exercise, check out the [Objects and Methods](http://tutorials.jumpstartlab.com/academy/workshops/objects_and_methods.html) workshop on the Jumpstart Lab tutorials site.
+
+Make the tests pass in the following sequence:
+
+* `test/candy_test.rb`
+* `test/bag_test.rb`
+* `test/costume_test.rb`
+* `test/trick_or_treater_test.rb`
+
+Run a test file by calling it with `ruby`:
+
+```bash
+$ ruby test/bag_test.rb
+```
+
+## Exercise 2
+
+Each object has become a little bit more complex.
+
+Make the tests pass in the following sequence:
+
+* `test/candy_test.rb`
+* `test/bag_test.rb`
+* `test/costume_test.rb`
+* `test/trick_or_treater_test.rb`
+

objects-and-methods/exercise-1/test/bag_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/bag'
+require_relative '../lib/candy'
+
+class BagTest < Minitest::Test
+  def test_a_new_bag_is_empty
+    assert Bag.new.empty?
+  end
+
+  def test_count_the_candies_in_an_empty_bag
+    skip
+    assert_equal 0, Bag.new.count
+  end
+
+  def test_empty_bag_has_no_candies
+    skip
+    assert_equal [], Bag.new.candies
+  end
+
+  def test_put_candy_in_the_bag
+    skip
+    bag = Bag.new
+    candy = Candy.new("Sour frogs")
+    bag << candy
+    assert_equal [candy], bag.candies
+  end
+
+  def test_a_bag_with_candies_is_not_empty
+    skip
+    bag = Bag.new
+    bag << Candy.new("Nerds")
+    refute bag.empty?
+  end
+
+  def test_bag_counts_candies
+    skip
+    bag = Bag.new
+    bag << Candy.new("Caramelized Almonds")
+    assert_equal 1, bag.count
+  end
+
+  def test_bag_contains_candies_and_candies_have_a_type
+    skip
+    bag = Bag.new
+    bag << Candy.new("Hershey's Kisses")
+    # You usually don't want to chain a bunch of different
+    # types of things together like this.
+    # We'll talk about it more in a few weeks.
+    # It's important to understand how these methods work, though.
+    type = bag.candies.first.type
+    assert_equal "Hershey's Kisses", type
+  end
+
+  def test_ask_bag_if_it_contains_a_particular_type_of_candy
+    skip
+    bag = Bag.new
+    bag << Candy.new("Lindt chocolate")
+
+    assert bag.contains?("Lindt chocolate")
+    refute bag.contains?("Hershey's chocolate")
+  end
+end
+

objects-and-methods/exercise-1/test/candy_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/candy'
+
+class CandyTest < Minitest::Test
+  def test_candy_type
+    candy = Candy.new("Skittles")
+    assert_equal candy.type, "Skittles"
+  end
+
+  def test_other_type_of_candy
+    skip
+    candy = Candy.new("Mars")
+    assert_equal candy.type, "Mars"
+  end
+end
+

objects-and-methods/exercise-1/test/costume_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/costume'
+
+class CostumeTest < Minitest::Test
+  def test_costume_style
+    costume = Costume.new("Batman")
+    assert_equal costume.style, "Batman"
+  end
+
+  def test_other_style_of_costume
+    skip
+    costume = Costume.new("Princess")
+    assert_equal costume.style, "Princess"
+  end
+end
+

objects-and-methods/exercise-1/test/trick_or_treater_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/costume'
+require_relative '../lib/bag'
+require_relative '../lib/candy'
+require_relative '../lib/trick_or_treater'
+
+class TrickOrTreaterTest < Minitest::Test
+  def test_wears_a_costume
+    costume = Costume.new("Cowboy")
+    trick_or_treater = TrickOrTreater.new(costume)
+    assert_equal "Cowboy", trick_or_treater.dressed_up_as
+  end
+
+  def test_wears_a_different_costume
+    skip
+    costume = Costume.new("Pony")
+    trick_or_treater = TrickOrTreater.new(costume)
+    assert_equal "Pony", trick_or_treater.dressed_up_as
+  end
+
+  def test_has_an_empty_bag_by_default
+    skip
+    trick_or_treater = TrickOrTreater.new(Costume.new("Alien"))
+    assert trick_or_treater.bag.empty?
+  end
+
+  def test_an_empty_bag_means_no_candy
+    skip
+    trick_or_treater = TrickOrTreater.new(Costume.new("Knight"))
+    refute trick_or_treater.has_candy?
+  end
+
+  def test_gets_candies
+    skip
+    trick_or_treater = TrickOrTreater.new(Costume.new("Spaceship Mechanic"))
+    trick_or_treater.bag << Candy.new("Gummy bears")
+    assert trick_or_treater.has_candy?
+  end
+
+  def test_counts_candies
+    skip
+    trick_or_treater = TrickOrTreater.new(Costume.new("Spaceship Mechanic"))
+    assert_equal 0, trick_or_treater.candy_count
+    trick_or_treater.bag << Candy.new("Gummy bears")
+    assert_equal 1, trick_or_treater.candy_count
+  end
+
+  def test_eats_candies
+    skip
+    trick_or_treater = TrickOrTreater.new(Costume.new("Baron"))
+    trick_or_treater.bag << Candy.new("Gummy worms")
+    trick_or_treater.bag << Candy.new("Liquorice")
+    trick_or_treater.bag << Candy.new("Salty Serpents")
+    assert_equal 3, trick_or_treater.candy_count
+    trick_or_treater.eat
+    assert_equal 2, trick_or_treater.candy_count
+    trick_or_treater.eat
+    assert_equal 1, trick_or_treater.candy_count
+    trick_or_treater.eat
+    assert_equal 0, trick_or_treater.candy_count
+  end
+end
+

objects-and-methods/exercise-2/test/bag_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/bag'
+require_relative '../lib/candy'
+
+class BagTest < Minitest::Test
+  def test_a_new_bag_is_empty
+    assert Bag.new.empty?
+  end
+
+  def test_count_the_candies_in_an_empty_bag
+    skip
+    assert_equal 0, Bag.new.count
+  end
+
+  def test_empty_bag_has_no_candies
+    skip
+    assert_equal [], Bag.new.candies
+  end
+
+  def test_put_candy_in_the_bag
+    skip
+    bag = Bag.new
+    candy = Candy.new("Sour frogs")
+    bag << candy
+    assert_equal [candy], bag.candies
+  end
+
+  def test_a_bag_with_candies_is_not_empty
+    skip
+    bag = Bag.new
+    bag << Candy.new("Nerds")
+    refute bag.empty?
+  end
+
+  def test_bag_counts_candies
+    skip
+    bag = Bag.new
+    bag << Candy.new("Caramelized Almonds")
+    assert_equal 1, bag.count
+  end
+
+  def test_bag_contains_candies_and_candies_have_a_type
+    skip
+    bag = Bag.new
+    bag << Candy.new("Hershey's Kisses")
+    # You usually don't want to chain a bunch of different
+    # types of things together like this.
+    # We'll talk about it more in a few weeks.
+    # It's important to understand how these methods work, though.
+    type = bag.candies.first.type
+    assert_equal "Hershey's Kisses", type
+  end
+
+  def test_ask_bag_if_it_contains_a_particular_type_of_candy
+    skip
+    bag = Bag.new
+    bag << Candy.new("Lindt chocolate")
+
+    assert bag.contains?("Lindt chocolate")
+    refute bag.contains?("Hershey's chocolate")
+  end
+
+  def test_get_a_particular_type_of_candy
+    skip
+    bag = Bag.new
+    bag << Candy.new("Jawbreaker")
+    bag << Candy.new("Jawbreaker")
+    bag << Candy.new("Jolly Ranchers")
+
+    candy = bag.grab "Jawbreaker"
+    assert_equal "Jawbreaker", candy.type
+  end
+
+  def test_grabbing_candy_removes_it_from_the_bag
+    skip
+    bag = Bag.new
+    bag << Candy.new("Reese's Pieces")
+    bag << Candy.new("Junior Mints")
+    bag << Candy.new("Reese's Pieces")
+    assert_equal 3, bag.count
+
+    candy = bag.grab "Reese's Pieces"
+    assert_equal 2, bag.count
+  end
+
+  def test_take_a_number_of_candies_from_the_bag
+    skip
+    bag = Bag.new
+    bag << Candy.new("Swedish Fish")
+    bag << Candy.new("Milky Way")
+    bag << Candy.new("Cotton Candy")
+
+    assert_equal 3, bag.count
+
+    taken = bag.take(2)
+    assert_equal 2, taken.size
+    assert_equal 1, bag.count
+  end
+
+  def test_take_one_candy
+    skip
+    bag = Bag.new
+    bag << Candy.new("Lifesavers")
+
+    candy = bag.take(1)
+    assert_equal "Lifesavers", candy.type
+  end
+end
+

objects-and-methods/exercise-2/test/candy_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/candy'
+
+class CandyTest < Minitest::Test
+  def test_candy_type
+    candy = Candy.new("Skittles")
+    assert_equal candy.type, "Skittles"
+  end
+
+  def test_other_type_of_candy
+    skip
+    candy = Candy.new("Mars")
+    assert_equal candy.type, "Mars"
+  end
+
+  def test_amount_of_sugar_is_100_by_default
+    skip
+    candy = Candy.new("Circus Peanuts")
+    assert_equal 100, candy.sugar
+  end
+
+  def test_amount_of_sugar_is_configurable
+    skip
+    candy = Candy.new("Pop Rocks", 78)
+    assert_equal 78, candy.sugar
+  end
+end
+

objects-and-methods/exercise-2/test/costume_test.rb

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+gem 'minitest', '~> 5.2'
+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative '../lib/costume'
+
+class CostumeTest < Minitest::Test
+  def test_costume_style
+    costume = Costume.new("Batman")
+    assert_equal costume.style, "Batman"
+  end
+
+  def test_other_style_of_costume
+    skip
+    costume = Costume.new("Princess")
+    assert_equal costume.style, "Princess"
+  end
+end
+