allergies.md

Allergies

An allergy test produces a single numeric score which contains the information about all the allergies the person has (that they were tested for).

The list of items (and their value) that were tested are:

• eggs (1)
• peanuts (2)
• shellfish (4)
• strawberries (8)
• tomatoes (16)
• chocolate (32)
• pollen (64)
• cats (128)

So if Tom is allergic to peanuts and chocolate, he gets a score of 34.

Write a program that, given a person's score can tell them - use the test file attached to verify your results.

a) whether or not they're allergic to a given item, and b) the full list of allergies.

allergies = Allergies.new(34)
allergies.allergic_to?('chocolate')
=> true
allergies.allergic_to?('cats')
=> false
allergies.list
=> ['peanuts', 'chocolate']

Allergies_test.rb

require 'minitest/autorun'
require 'minitest/reporters' # optional

Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new() # optional

require_relative './allergies'


class AllergiesTest < MiniTest::Test

  def test_no_allergies_at_all
    allergies = Allergies.new(0)
    assert_equal [], allergies.list
  end

  def test_allergic_to_just_eggs
    allergies = Allergies.new(1)
    assert_equal ['eggs'], allergies.list
  end

  def test_allergic_to_just_peanuts
    allergies = Allergies.new(2)
    assert_equal ['peanuts'], allergies.list
  end

  def test_allergic_to_just_strawberries

    allergies = Allergies.new(8)
    assert_equal ['strawberries'], allergies.list
  end

  def test_allergic_to_eggs_and_peanuts
    allergies = Allergies.new(3)
    assert_equal ['eggs', 'peanuts'], allergies.list
  end

  def test_allergic_to_more_than_eggs_but_not_peanuts
    allergies = Allergies.new(5)
    assert_equal ['eggs', 'shellfish'], allergies.list
  end

  def test_allergic_to_lots_of_stuff
    allergies = Allergies.new(248)
    assert_equal ["strawberries", "tomatoes", "chocolate", "pollen", "cats"], allergies.list
  end

  def test_allergic_to_everything
    allergies = Allergies.new(255)
    assert_equal ["eggs", "peanuts", "shellfish", "strawberries", "tomatoes", "chocolate", "pollen", "cats"], allergies.list
  end

  def test_no_allergies_means_not_allergic
    allergies = Allergies.new(0)
    assert !allergies.allergic_to?('peanuts')
    assert !allergies.allergic_to?('cats')
    assert !allergies.allergic_to?('strawberries')
  end

  def test_is_allergic_to_eggs
    allergies = Allergies.new(1)
    assert allergies.allergic_to?('eggs')
  end

  def test_allergic_to_eggs_in_addition_to_other_stuff
    allergies = Allergies.new(5)
    assert allergies.allergic_to?('eggs')
  end

  def test_ignore_non_allergen_score_parts
    allergies = Allergies.new(509)
    assert_equal ["eggs", "shellfish", "strawberries", "tomatoes", "chocolate", "pollen", "cats"], allergies.list
  end

end