updated lessons for two-day ruby

Author: ultrasaurus

01_class/calculator.rb renamed to 01_class/calculator1.rb

@@ -0,0 +1,22 @@
+class Calculator
+  attr_reader :num_calculations
+  attr_accessor :name
+
+  @@num_calculators = 0
+
+  def initialize
+    @num_calculations = 0
+    @name = "I am a really neat calculator!"
+    @@num_calculators += 1
+  end
+  
+  def self.num_calculators
+    @@num_calculators
+  end
+  
+  def add(a, b)
+    @num_calculations = @num_calculations + 1
+    a + b
+  end
+end
+

01_class/calculator2_with_attr.rb

@@ -21,4 +21,45 @@
   it "subtracts numbers" do
     @calculator.subtract(10,4).should == 6
   end
+
+  describe "#sum" do
+    it "computes the sum of an empty array" do
+      pending
+      @calculator.sum([]).should == 0
+    end
+    
+    it "computes the sum of an array of one number" do
+      pending
+      @calculator.sum([7]).should == 7
+    end
+    
+    it "computes the sum of an array of two numbers" do
+      pending
+      @calculator.sum([7,11]).should == 18
+    end
+    
+    it "computes the sum of an array of many numbers" do
+      pending
+      @calculator.sum([1,3,5,7,9]).should == 25
+    end
+  end
+  
+  # Test-Driving Bonus: once the above tests pass, 
+  # write tests and code for the following:
+  
+  it "multiplies two numbers"
+
+  it "multiplies an array of numbers"
+  
+  it "raises one number to the power of another number"
+  
+  # http://en.wikipedia.org/wiki/Factorial
+  describe "#factorial" do
+    it "computes the factorial of 0"
+    it "computes the factorial of 1"
+    it "computes the factorial of 2"
+    it "computes the factorial of 5"
+    it "computes the factorial of 10"
+  end
+
 end

05_calculator/calculator_spec.rb

@@ -0,0 +1,42 @@
+describe "Simon says" do
+  
+  it "should echo hello" do
+    echo("hello").should == "hello"
+  end
+  
+  it "should echo bye" do
+    echo("bye").should == "bye"
+  end
+
+  it "should shout hello" do
+    shout("hello").should == "HELLO"
+  end
+  
+  it "should shout multiple words" do
+    shout("hello world").should == "HELLO WORLD"
+  end
+
+  it "should repeat" do
+    repeat("hello").should == "hello hello"
+  end
+
+  it "should repeat a number of times" do
+    repeat("hello", 3).should == "hello hello hello"
+  end
+
+  it "should return the first letter" do
+    start_of_word("hello", 1).should == "h"
+  end
+  
+  it "should return the first two letters" do
+    start_of_word("Bob", 2).should == "Bo"
+  end
+
+  it "should tell us the first word of 'Hello World' is 'Hello'" do
+    first_word("Hello World").should == "Hello"
+  end
+
+  it "should tell us the first word of 'oh dear' is 'oh'" do
+    first_word("Hello World").should == "oh"
+  end
+end

07_simon_says/simon_spec.rb

@@ -0,0 +1,40 @@
+require 'fakeweb'
+require 'news'
+
+describe News do
+
+  before do
+    f = File.new("cnn.html", "r")
+    FakeWeb.register_uri(:get, "http://www.cnn.com", :body => f.read)
+    @news = News.new
+  end
+
+  it "should allow you to set the uri" do
+    @news.uri = "http://www.cnn.com"
+    @news.uri.should == "http://www.cnn.com"
+  end
+
+  it "should fetch the page when you set the uri" do
+    @news.uri = "http://www.cnn.com"
+    @news.source_data.should == File.new("cnn.html", "r").read      
+  end
+
+  describe "#top_story" do
+    it "should find the first list item after 'Latest news' heading" do
+      FakeWeb.register_uri(:get, "http://www.test1.com", :body => "<h4>Latest news</h4><ul><li><a href=\"http://something.com\">Story Name</a>")
+      @news.uri = "http://www.test1.com"
+      @news.top_story.should == 
+        {:url => "http://something.com",
+         :title => "Story Name"}
+    end
+
+    it "should return the first headlines with url listed under 'Latest News'" do
+      @news.uri = "http://www.cnn.com"
+      @news.top_story.should == 
+        {:url => "/2010/WORLD/americas/01/31/haiti.us.airlifts/index.html?hpt=T2",
+         :title => "Evacuations of Haitians to U.S. to resume"}
+    end
+  end
+
+end
+