Adding solution

lib/tree.rb

@@ -1,38 +1,62 @@
 class NoApplesError < StandardError; end
 
 class Tree
-  attr_#fill_in :height, :age, :apples, :alive
+  attr_reader :height, :age, :apples, :alive
 
   def initialize
+    @height = 0
+    @age = 0
+    @apples = []
+    @alive = true
   end
 
   def age!
+    if @age.between?(0,5)
+      @age += 1
+      @height += rand(1..3)
+    elsif @age.between?(5,10)
+      @age+=1
+      @height += rand(1..3)
+      add_apples
+    else
+      @alive = false
+    end
   end
 
   def add_apples
+    rand(1..50).times do 
+      @apples << Apple.new("red", rand(1..3))
+    end
   end
 
   def any_apples?
+    @apples.length > 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
 
-class Apple <
-  attr_reader #what should go here 
+class Apple < Fruit
+  attr_reader :color, :diameter#what should go here 
 
   def initialize(color, diameter)
+    super()
+    @color = color
+    @diameter = diameter
   end
 end
 
@@ -61,7 +85,7 @@ 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 = diameter_sum / basket.length# It's up to you to calculate the average diameter for this harvest.
 
     puts "Year #{tree.age} Report"
     puts "Tree height: #{tree.height} feet"

spec/tree_spec.rb

@@ -2,13 +2,70 @@
 require_relative '../lib/tree'
 
 describe Tree do
+  let (:tree) {Tree.new}
+
   it 'should be a Class' do
-    expect(described_class.is_a? Class).to eq true
+    expect(Tree.is_a? Class).to eq true
+  end
+
+  it 'should initalize empty' do
+    expect(tree.apples).to eq []
+    expect(tree.alive).to eq true
+    expect(tree.height).to eq 0
+    expect(tree.age).to eq 0
+  end
+
+  it 'should grow when it ages' do 
+    tree.age!
+    expect(tree.height > 0).to eq true
+    expect(tree.age).to eq 1
+  end
+
+  it 'should gorw apples' do
+    7.times {tree.age!}
+    expect(tree.any_apples?).to eq true
+  end
+
+  it 'should be able to pick an apple' do 
+    7.times {tree.age!}
+    expect(tree.pick_an_apple!).to be_a Apple
+  end
+
+  it 'should die of old age' do
+    12.times {tree.age!}
+    expect(tree.alive).to eq false
   end
 end
 
 describe 'Fruit' do
+  let(:fruit) {Fruit.new}
+
+
+  it 'should be a Class' do
+    expect(Fruit.is_a? Class).to eq true
+  end
+
+  it 'should have seeds' do
+    expect(fruit.has_seeds).to eq true
+  end
 end
 
 describe 'Apple' do
+  let(:apple) {Apple.new('Green', 2)}
+
+  it 'should be a Class' do
+    expect(Apple.is_a? Class).to eq true
+  end
+
+  it 'should have seeds' do
+    expect(apple.has_seeds).to eq true
+  end
+
+  it 'should have color' do
+    expect(apple.color).to eq 'Green'
+  end
+
+  it 'should have a diameter' do
+    expect(apple.diameter).to eq 2
+  end
 end