update equality for Book.

2 files changed, 23 insertions, 2 deletions

diff --git a/lib/book.rb b/lib/book.rb
index a883e49..60557e5 100644
--- a/lib/book.rb
+++ b/lib/book.rb
@@ -1,12 +1,15 @@
 class Book
-  attr_reader :title
+  attr_reader :title, :author, :publisher, :year_published
   def initialize(title, author, publisher, year_published)
     @title=title
+    @author=author
+    @publisher=publisher
+    @year_published = year_published
   end
   def is_titled?(title)
     @title == title
   end
   def ==(other)
-    other.kind_of?( Book ) && @title == other.title
+    other.kind_of?( Book ) && @title == other.title && @author == other.author && @publisher == other.publisher && @year_published == other.year_published
   end
 end
diff --git a/test/book_specs.rb b/test/book_specs.rb
index 3129d76..805aef6 100644
--- a/test/book_specs.rb
+++ b/test/book_specs.rb
@@ -21,6 +21,24 @@ class TestBook < Test::Unit::TestCase
   end
 end
 
+describe Book do 
+  describe "when testing equality" do 
+    def setup
+      @publisher = Publisher.new("Pear press");
+      @book = Book.new("Brain Rules for Baby", "John Medina", @publisher, 2010)
+    end
+    it "should be equal when it's the same instance" do 
+      assert_equal(@book, @book)
+    end
+    it "should be equal when they are the same book" do 
+      assert_equal(@book, Book.new("Brain Rules for Baby", "John Medina", @publisher, 2010))
+    end
+    it "should not be equal when they are different books" do 
+      refute_equal(@book, Book.new("Brain Rules for Baby", "some other guy", @publisher, 2009))
+    end
+  end
+end
+
 class Game
   attr_reader :title;
   def initialize(title, author, publisher, year)