Justin Holm solution

Gemfile.lock

@@ -1,4 +1,5 @@
 GEM
+  remote: https://rubygems.org/
   specs:
     diff-lcs (1.2.5)
     rspec (3.1.0)
@@ -19,3 +20,6 @@ PLATFORMS
 
 DEPENDENCIES
   rspec
+
+BUNDLED WITH
+   1.14.6

lib/tree.rb

@@ -1,38 +1,69 @@
 class NoApplesError < StandardError; end
 
-class AppleTree
-  attr_#fill_in :height, :age, :apples, :alive
-
-  def initialize
+class Tree
+  attr_reader :height, :age, :apples, :alive
+
+  def initialize(height = 0, age = 0, apples = [], alive = true)
+    @height = height
+    @age = age
+    @apples = apples
+    @alive = alive
   end
 
   def age!
+    # Age our tree by one year
+    @age += 1
+
+    # Grow our tree a rand height between 1-3 feet per year
+    @height += rand(1..3)
+
+    # Wait for our tree to age until 5, grow some fruit, then steal it
+    if @age >= 5
+      rand(100..300).times{ add_apples }
+    end
+
+    # Our poor tree dies exactly on its 30th birthday, assuming its fruit has been picked
+    if @age >= 30
+      @alive = false
+    end
   end
 
   def add_apples
+    # Push a new red apple. Choose a random diameter size between 5-10 inch 
+    @apples.push Apple.new('red', rand(4..10))
   end
 
   def any_apples?
+    @apples.count > 0
   end
 
   def pick_an_apple!
     raise NoApplesError, "This tree has no apples" unless self.any_apples?
+    @apples.pop
   end
 
   def dead?
+    !@alive
   end
 end
 
 class Fruit
+  attr_reader :has_seeds
+
   def initialize
-    has_seeds = true
+    @has_seeds = true
   end
-end
+end 
 
-class Apple <
-  attr_reader #what should go here 
+class Apple < Fruit
+  attr_reader :color, :diameter
 
   def initialize(color, diameter)
+    @color = color
+    @diameter = diameter
+
+    # Call our Fruit initialize method
+    super()
   end
 end
 
@@ -61,7 +92,7 @@ def tree_data
       diameter_sum += apple.diameter
     end
 
-    avg_diameter = # It's up to you to calculate the average diameter for this harvest.
+    avg_diameter = basket.count > 0 ? diameter_sum / basket.count : 0
 
     puts "Year #{tree.age} Report"
     puts "Tree height: #{tree.height} feet"
@@ -76,4 +107,4 @@ def tree_data
 end
 
 # Uncomment this line to run the script, but BE SURE to comment it before you try to run your tests!
-# tree_data
+#tree_data

spec/tree_spec.rb

@@ -2,13 +2,93 @@
 require 'tree'
 
 describe 'Tree' do
+  before :each do
+    @tree = Tree.new
+  end
+
   it 'should be a Class' do
-    expect(described_class.is_a? 'Class').to be_true
+    expect(@tree.is_a? Tree).to eq true
+  end
+
+  it 'should have no (0) age initially' do
+    expect(@tree.age).to eq 0
+  end
+
+  it 'should have no (0) height initially' do
+    expect(@tree.height).to eq 0
+  end
+
+  it 'should have no apples initially' do
+    expect(@tree.apples.count).to eq 0
+  end
+
+  it 'should be alive' do
+    expect(@tree.alive).to eq true
+  end
+
+  it 'should increase age by 1 when age is called' do
+    @tree.age!
+    expect(@tree.age).to eq 1
+  end
+
+  it 'should increase height every year after its first 5 years' do
+    @tree.age!
+    expect(@tree.height).not_to eq 0
+  end
+
+  it 'should have apples after the first 5 years' do
+    5.times{ @tree.age! }
+    expect(@tree.apples.count).not_to eq 0
+  end
+
+  it 'should die after 30 years' do
+    30.times{ @tree.age! }
+    expect(@tree.alive).to eq false
+  end
+
+  it 'should be able to pick an apple' do
+    basket = []
+    while @tree.apples.count == 0
+      @tree.age!
+    end
+
+    basket << @tree.pick_an_apple!
+    expect(basket.count).to eq 1
+  end
+
+  it 'should decrease the total amount of apples when they are picked' do
+    basket = []
+    while @tree.apples.count == 0
+      @tree.age!
+    end
+
+    num_before = @tree.apples.count
+    basket << @tree.pick_an_apple!
+    expect(@tree.apples.count).not_to eq num_before
   end
 end
 
 describe 'Fruit' do
+  it 'should be a class' do
+    @fruit = Fruit.new
+    expect(@fruit.is_a? Fruit).to eq true
+  end
 end
 
 describe 'Apple' do
+  before :each do
+    @apple = Apple.new('red', 5)
+  end
+
+  it 'should be a class' do
+    expect(@apple.is_a? Apple).to eq true
+  end
+
+  it 'should have a color' do
+    expect(@apple.color).to eq 'red'
+  end
+
+  it 'should have a diameter of 5' do
+    expect(@apple.diameter).to eq 5
+  end
 end