Created
March 3, 2015 14:20
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Composition Challenge
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require 'minitest/autorun' | |
require 'minitest/pride' | |
# Write a class which wraps around an array, but only allows odd numbers | |
# to be stored in the array. | |
class OddArray | |
def initialize(array) | |
@array = [] | |
array.each do |num| | |
@array << num if num.odd? | |
end | |
end | |
def to_a | |
@array.to_a | |
end | |
def add(i) | |
@array << i if i.odd? | |
end | |
end | |
class CompositionChallenge < MiniTest::Test | |
def test_class_exists | |
assert OddArray | |
end | |
def test_initializer_takes_array_parameter | |
assert OddArray.new([1, 3, 5]) | |
end | |
def test_to_a | |
odd_array = OddArray.new([1, 3, 5]) | |
assert_equal [1, 3, 5], odd_array.to_a | |
end | |
def test_add_number | |
odd_array = OddArray.new([1, 3, 5]) | |
odd_array.add(7) | |
assert_equal [1, 3, 5, 7], odd_array.to_a | |
end | |
def test_initialize_with_evens | |
odd_array = OddArray.new([1, 2, 3, 4, 5]) | |
assert_equal [1, 3, 5], odd_array.to_a | |
end | |
def test_add_evens | |
odd_array = OddArray.new([1, 3, 5]) | |
odd_array.add(2) | |
assert_equal [1, 3, 5], odd_array.to_a | |
end | |
def test_add_negatives | |
odd_array = OddArray.new([-1, -2, 3, 4, -5]) | |
odd_array.add(-4) | |
assert_equal [-1, 3, -5], odd_array.to_a | |
end | |
end |
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