Hari's solution

lib/tree.rb

@@ -1,26 +1,40 @@
 class NoApplesError < StandardError; end
 
-class AppleTree
-  attr_#fill_in :height, :age, :apples, :alive
+class Tree
+  attr_reader :age, :apples, :alive
+  attr_accessor :height
 
   def initialize
+    @height = 0
+    @age = 0
+    @apples = []
+    @alive = true
   end
 
   def age!
+    @age += 1 if @alive
+    @height += rand(0..2) if @alive
+    add_apples if @alive and @age > 5
+    @alive = false if @age > 30 or @height > 30
   end
 
   def add_apples
+    rand(2..30).times{ |x| @apples << Apple.new('green', rand(1..4))}
   end
 
   def any_apples?
+    not @apples.empty?
   end
 
   def pick_an_apple!
-    raise NoApplesError, "This tree has no apples" unless self.any_apples?
+    raise NoApplesError, "This tree has no apples" unless any_apples?
+    @apples.pop
   end
 
   def dead?
+    not @alive
   end
+
 end
 
 class Fruit
@@ -29,10 +43,12 @@ def initialize
   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
   end
 end
 
@@ -61,7 +77,7 @@ 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 +2,68 @@
 require 'tree'
 
 describe 'Tree' do
+
+  let(:tree) { Tree.new }
+
   it 'should be a Class' do
-    expect(described_class.is_a? 'Class').to be_true
+    expect(Tree.is_a? Class).to eq true
+  end
+
+  it 'should have no apples initially' do
+    expect(tree.any_apples?).to eq false
+  end
+
+  it 'should be able to add/grow apples' do
+  	tree.add_apples
+    expect(tree.any_apples?).to eq true
+  end
+
+  it 'dies after living for 30 years' do
+  	32.times { |x| tree.age! }
+    expect(tree.dead?).to eq true
+  end
+
+  it 'dies when it is 30 feets height' do
+  	tree.height = 31
+  	tree.age!
+  	expect(tree.dead?).to eq true
+  end
+
+  it 'should age' do
+  	tree.age!
+    expect(tree.age).to eq 1
+  end
+
+  it 'should be able to pick an apple' do
+  	6.times { |x| tree.age! }
+    expect(tree.pick_an_apple!.is_a? Apple).to eq true
+  end
+
+  it 'should raise problem when no apples' do
+    expect{tree.pick_an_apple!}.to raise_error NoApplesError
   end
+
 end
 
 describe 'Fruit' do
+  it 'should be a Class' do
+    expect(Fruit.is_a? Class).to eq true
+  end
 end
 
 describe 'Apple' do
+  it 'should be a Class' do
+    expect(Apple.is_a? Class).to eq true
+  end
+
+  it 'should be a Fruit Class' do
+    expect(Apple.superclass).to eq Fruit
+  end
+
+  it 'has color and diameter' do
+    apple = Apple.new('green', 2)
+    expect(apple.color).to eq 'green'
+    expect(apple.diameter).to eq 2
+  end
+
 end