Bowling Challenge

.rspec

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+--require spec_helper

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+# gem "rails"
+
+gem "rspec", "~> 3.12"

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.5.0)
+    rspec (3.12.0)
+      rspec-core (~> 3.12.0)
+      rspec-expectations (~> 3.12.0)
+      rspec-mocks (~> 3.12.0)
+    rspec-core (3.12.1)
+      rspec-support (~> 3.12.0)
+    rspec-expectations (3.12.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-mocks (3.12.4)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.12.0)
+    rspec-support (3.12.0)
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  rspec (~> 3.12)
+
+BUNDLED WITH
+   2.4.8

lib/bowling_game.rb

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+class BowlingGame
+
+  def initialize
+    # Empty array that contains no 'rolls' when a new game is created
+    @rolls = []
+  end
+
+  def roll(pins) # Pins is the number of pins knocked down in a roll
+    # Pushes the roll (number of pins) into the rolls array
+    @rolls << pins
+  end
+
+  def score
+    total_score = 0
+    # Index of the @rolls array
+    roll_index = 0
+
+    # Loops through frame 10 times to cover a full game
+    10.times do |frame|
+      if strike?(roll_index)
+        total_score += strike_score(roll_index)
+        roll_index += 1
+      elsif spare?(roll_index)
+        total_score += spare_score(roll_index)
+        roll_index += 2
+      else
+        total_score += frame_score(roll_index)
+        roll_index += 2
+      end
+    end
+
+    return total_score
+  end
+
+  private
+
+  def spare?(roll_index)
+    @rolls[roll_index] + @rolls[roll_index + 1] == 10
+  end
+
+  def spare_score(roll_index)
+    10 + @rolls[roll_index + 2]
+  end
+
+  def strike?(roll_index)
+    @rolls[roll_index] == 10
+  end
+
+  def strike_score(roll_index)
+    10 + @rolls[roll_index + 1] + @rolls[roll_index + 2]
+  end
+
+  def frame_score(roll_index)
+    @rolls[roll_index] + @rolls[roll_index + 1] 
+  end
+
+end

spec/bowling_game_spec.rb

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+require 'bowling_game'
+
+RSpec.describe BowlingGame do
+
+  before(:each) do
+    @game = BowlingGame.new
+  end
+
+  it "constructs a game" do
+    game = BowlingGame.new
+  end
+
+  context "when a player rolls all zeros" do
+    it "scores a gutter game" do
+      20.times do 
+        @game.roll(0)
+      end
+      expect(@game.score).to eq 0
+    end
+  end
+
+  context "when a player rolls all ones" do
+    it "scores a game of 20" do
+      20.times do
+        @game.roll(1)
+      end
+      expect(@game.score).to eq 20
+    end
+  end
+
+  context "when a player rolls a spare" do
+    it "adds the score of the next roll on to the 10 from the spare" do
+      @game.roll(5)
+      @game.roll(5)
+      @game.roll(5)
+      @game.roll(3) 
+      16.times do
+        @game.roll(0)
+      end
+      expect(@game.score).to eq 23
+    end
+  end
+
+  context "when a player rolls a strike" do
+    it "adds the score of the next two rolls on to the 10 from the strike" do
+      @game.roll(10)
+      @game.roll(5)
+      @game.roll(2)
+      16.times do 
+        @game.roll(0)
+      end
+      expect(@game.score).to eq 24 
+    end
+  end
+
+  context "when a player rolls all strikes" do
+    it "scores a perfect game" do
+      12.times do
+        @game.roll(10)
+      end
+      expect(@game.score).to eq 300
+    end
+  end
+
+end

spec/spec_helper.rb

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+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# The generated `.rspec` file contains `--require spec_helper` which will cause
+# this file to always be loaded, without a need to explicitly require it in any
+# files.
+#
+# Given that it is always loaded, you are encouraged to keep this file as
+# light-weight as possible. Requiring heavyweight dependencies from this file
+# will add to the boot time of your test suite on EVERY test run, even for an
+# individual file that may not need all of that loaded. Instead, consider making
+# a separate helper file that requires the additional dependencies and performs
+# the additional setup, and require it from the spec files that actually need
+# it.
+#
+# See https://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  # rspec-expectations config goes here. You can use an alternate
+  # assertion/expectation library such as wrong or the stdlib/minitest
+  # assertions if you prefer.
+  config.expect_with :rspec do |expectations|
+    # This option will default to `true` in RSpec 4. It makes the `description`
+    # and `failure_message` of custom matchers include text for helper methods
+    # defined using `chain`, e.g.:
+    #     be_bigger_than(2).and_smaller_than(4).description
+    #     # => "be bigger than 2 and smaller than 4"
+    # ...rather than:
+    #     # => "be bigger than 2"
+    expectations.include_chain_clauses_in_custom_matcher_descriptions = true
+  end
+
+  # rspec-mocks config goes here. You can use an alternate test double
+  # library (such as bogus or mocha) by changing the `mock_with` option here.
+  config.mock_with :rspec do |mocks|
+    # Prevents you from mocking or stubbing a method that does not exist on
+    # a real object. This is generally recommended, and will default to
+    # `true` in RSpec 4.
+    mocks.verify_partial_doubles = true
+  end
+
+  # This option will default to `:apply_to_host_groups` in RSpec 4 (and will
+  # have no way to turn it off -- the option exists only for backwards
+  # compatibility in RSpec 3). It causes shared context metadata to be
+  # inherited by the metadata hash of host groups and examples, rather than
+  # triggering implicit auto-inclusion in groups with matching metadata.
+  config.shared_context_metadata_behavior = :apply_to_host_groups
+
+# The settings below are suggested to provide a good initial experience
+# with RSpec, but feel free to customize to your heart's content.
+=begin
+  # This allows you to limit a spec run to individual examples or groups
+  # you care about by tagging them with `:focus` metadata. When nothing
+  # is tagged with `:focus`, all examples get run. RSpec also provides
+  # aliases for `it`, `describe`, and `context` that include `:focus`
+  # metadata: `fit`, `fdescribe` and `fcontext`, respectively.
+  config.filter_run_when_matching :focus
+
+  # Allows RSpec to persist some state between runs in order to support
+  # the `--only-failures` and `--next-failure` CLI options. We recommend
+  # you configure your source control system to ignore this file.
+  config.example_status_persistence_file_path = "spec/examples.txt"
+
+  # Limits the available syntax to the non-monkey patched syntax that is
+  # recommended. For more details, see:
+  # https://relishapp.com/rspec/rspec-core/docs/configuration/zero-monkey-patching-mode
+  config.disable_monkey_patching!
+
+  # This setting enables warnings. It's recommended, but in some cases may
+  # be too noisy due to issues in dependencies.
+  config.warnings = true
+
+  # Many RSpec users commonly either run the entire suite or an individual
+  # file, and it's useful to allow more verbose output when running an
+  # individual spec file.
+  if config.files_to_run.one?
+    # Use the documentation formatter for detailed output,
+    # unless a formatter has already been configured
+    # (e.g. via a command-line flag).
+    config.default_formatter = "doc"
+  end
+
+  # Print the 10 slowest examples and example groups at the
+  # end of the spec run, to help surface which specs are running
+  # particularly slow.
+  config.profile_examples = 10
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = :random
+
+  # Seed global randomization in this process using the `--seed` CLI option.
+  # Setting this allows you to use `--seed` to deterministically reproduce
+  # test failures related to randomization by passing the same `--seed` value
+  # as the one that triggered the failure.
+  Kernel.srand config.seed
+=end
+end