Initial cut

Gemfile

@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
 
 gem 'rubocop', require: false
-gem 'rspec'
+gem 'rspec'

gem_city.rb

@@ -0,0 +1,43 @@
+# This class represents the town of GemCity
+# This is a town riddled with crime but we can find out how happy the town is
+class GemCity
+  attr_reader :population
+  attr_accessor :thieves, :officers
+
+  def initialize
+    @thieves = 5
+    @officers = 1
+    @population = 50
+  end
+
+  def happiness_of_town
+    # happiness is random... people don't know what they want!
+    happiness_vals = (1..population).collect do
+      rand((100 - successful_crime_rate)..100)
+    end
+    happiness = happiness_vals.reduce(0, :+)
+    happiness / 100
+  end
+
+  def no_crimes_can_occur?
+    thieves <= 0 || officers > thieves
+  end
+
+  def crime_probability
+    (1 - officers.to_f / thieves.to_f) * 100
+  end
+
+  def successful_crime_rate
+    no_crimes_can_occur? ? 0 : crime_probability
+  end
+
+  def percentage_of_population(group)
+    format('%.0f%', (group.to_f / population.to_f) * 100.0)
+  end
+
+  def city_demographics
+    { thieves: percentage_of_population(thieves),
+      officers: percentage_of_population(officers),
+      civilians: percentage_of_population(population - thieves - officers) }
+  end
+end

gem_city_spec.rb

@@ -1,5 +1,5 @@
 require 'rspec'
-require_relative 'GemCity' # This line may need to be changed
+require_relative 'gem_city'
 
 describe 'Gem City' do
   let(:city) { GemCity.new }
@@ -15,19 +15,19 @@
     end
 
     it 'officers = thieves' do
-      city.thieves 1
-      city.setOfficers 1 # This line may need to be changed
+      city.thieves = 1
+      city.officers = 1
       expect(city.successful_crime_rate).to eq(0)
     end
 
     it 'thieves = 0' do
-      city.thieves 0
+      city.thieves = 0
       expect(city.successful_crime_rate).to eq(0)
     end
 
     it 'officers > thieves' do
-      city.thieves 1
-      city.setOfficers 2 # This line may need to be changed
+      city.thieves = 1
+      city.officers = 2
       expect(city.successful_crime_rate).to eq(0)
     end
   end
@@ -38,26 +38,26 @@
     end
 
     it 'successful_crime_rate = 0' do
-      city.thieves 0
+      city.thieves = 0
       expect(city.happiness_of_town).to eq(50)
     end
   end
 
-  # context 'city_demographics' do
-  #   it 'initialize' do
-  #     demographics = city.city_demographics
-  #     expect(demographics[:thieves]).to eq('10%')
-  #     expect(demographics[:officers]).to eq('2%')
-  #     expect(demographics[:civilians]).to eq('88%')
-  #   end
-
-  #   it 'thieves = 10, officers = 25' do
-  #     city.thieves = 10
-  #     city.officers = 25
-  #     demographics = city.city_demographics
-  #     expect(demographics[:thieves]).to eq('20%')
-  #     expect(demographics[:officers]).to eq('50%')
-  #     expect(demographics[:civilians]).to eq('30%')
-  #   end
-  # end
+  context 'city_demographics' do
+    it 'initialize' do
+      demographics = city.city_demographics
+      expect(demographics[:thieves]).to eq('10%')
+      expect(demographics[:officers]).to eq('2%')
+      expect(demographics[:civilians]).to eq('88%')
+    end
+
+    it 'thieves = 10, officers = 25' do
+      city.thieves = 10
+      city.officers = 25
+      demographics = city.city_demographics
+      expect(demographics[:thieves]).to eq('20%')
+      expect(demographics[:officers]).to eq('50%')
+      expect(demographics[:civilians]).to eq('30%')
+    end
+  end
 end