Add ex03-wallet to ruby module (#6)

Author: ysv

courses/ruby/ex03-wallet/README.md

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+# TODO: Structure and finalize me please !
+
+Use ex01 README.md as a template.

courses/ruby/ex03-wallet/wallet.rb

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+class Wallet
+
+end

courses/ruby/ex03-wallet/wallet_test.rb

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+require 'minitest/autorun'
+require 'minitest/pride'
+require_relative 'wallet'
+
+class WalletTest < Minitest::Test
+  def test_wallet_starts_at_zero
+    skip
+    wallet = Wallet.new
+    assert_equal 0, wallet.cents
+    assert_equal 0, wallet.dollars
+  end
+
+  def test_wallet_starts_at_non_zero
+    skip
+    wallet = Wallet.new(:penny, :nickel)
+    assert_equal 6, wallet.cents
+    assert_equal 0.06, wallet.dollars
+  end
+
+  def test_add_pennies
+    skip
+    wallet = Wallet.new
+    wallet << :penny
+    assert_equal 1, wallet.cents
+    assert_equal 0.01, wallet.dollars
+
+    3.times { wallet << :penny }
+    assert_equal 4, wallet.cents
+    assert_equal 0.04, wallet.dollars
+  end
+
+  def test_add_nickels
+    skip
+    wallet = Wallet.new
+    wallet << :nickel
+    assert_equal 5, wallet.cents
+    assert_equal 0.05, wallet.dollars
+
+    3.times { wallet << :nickel }
+    assert_equal 20, wallet.cents
+    assert_equal 0.2, wallet.dollars
+  end
+
+  def test_add_dimes
+    skip
+    wallet = Wallet.new
+    wallet << :dime
+    assert_equal 10, wallet.cents
+    assert_equal 0.1, wallet.dollars
+
+    3.times { wallet << :dime }
+    assert_equal 40, wallet.cents
+    assert_equal 0.4, wallet.dollars
+  end
+
+  def test_add_quarters
+    skip
+    wallet = Wallet.new
+    wallet << :quarter
+    assert_equal 25, wallet.cents
+    assert_equal 0.25, wallet.dollars
+
+    3.times { wallet << :quarter }
+    assert_equal 100, wallet.cents
+    assert_equal 1, wallet.dollars
+  end
+
+  def test_add_dollars
+    skip
+    wallet = Wallet.new
+    wallet << :dollar
+    assert_equal 100, wallet.cents
+    assert_equal 1, wallet.dollars
+
+    3.times { wallet << :dollar }
+    assert_equal 400, wallet.cents
+    assert_equal 4, wallet.dollars
+
+  end
+
+  def test_take_coins_out
+    skip
+    wallet = Wallet.new
+    wallet << :penny
+    wallet << :penny
+    wallet << :penny
+    wallet << :penny
+
+    wallet.take(:penny)
+    assert_equal 3, wallet.cents
+    assert_equal 0.03, wallet.dollars
+
+    wallet.take(:penny, :penny)
+    assert_equal 1, wallet.cents
+    assert_equal 0.01, wallet.dollars
+
+  end
+
+  def test_take_various_coins_out
+    skip
+    wallet = Wallet.new
+    wallet << :penny
+    wallet << :dime
+    wallet << :quarter
+    wallet << :quarter
+
+    wallet.take(:dime, :quarter)
+    assert_equal 26, wallet.cents
+    assert_equal 0.26, wallet.dollars
+
+  end
+
+  def test_ignore_coins_that_are_not_there
+    skip
+    wallet = Wallet.new
+    wallet << :penny
+    wallet.take(:dime)
+    assert_equal 1, wallet.cents
+    assert_equal 0.01, wallet.dollars
+  end
+end