books_controller.rb

class BooksController < ApplicationController
  def new
    @book = Book.new
  end

  def create
    Book.create(params['book'])
    redirect_to books_path
  end

  def index
    @books = Book.all
  end
end

books_controller_spec.rb

require 'spec_helper'


describe BooksController do
  before :each do
    mock_model("Book")
  end

  describe "GET 'new'" do
    before :each do
      get :new
    end

    it "assigns a new Book to @book" do
      assigns(:book).should_not be_nil
      assigns(:book).class.should eq(Book)
    end
  end

  describe "POST 'index'" do
    before :each do
      @attrs = FactoryGirl.attributes_for(:book)
    end
    
    it "creates a new Book given valid attributes" do
      initial_count = Book.count
      post :index, @attrs
      (Book.count > initial_count).should be_true
    end
  end
  
  describe "GET 'index" do
    before :each do
      10.times { FactoryGirl.create(:book) }
      get :index
    end

    it "assigns an array of Books called @books" do
      assigns(:books).should_not be_nil
      assigns(:books).class.should eq(Array)
      assigns(:books)[0].class.should eq(Book)
    end
  end
end

Error

› rake spec cucumber
/Users/rpowell93/.rvm/rubies/ruby-1.9.3-p0/bin/ruby -S rspec ./spec/controllers/books_controller_spec.rb ./spec/helpers/books_helper_spec.rb ./spec/models/book_spec.rb ./spec/views/books/index.html.erb_spec.rb ./spec/views/books/new.html.erb_spec.rb
.F....

Failures:

  1) BooksController POST 'index' creates a new Book given valid attributes
     Failure/Error: (Book.count > initial_count).should be_true
       expected false to be true
     # ./spec/controllers/books_controller_spec.rb:28:in `block (3 levels) in <top (required)>'

Finished in 3.09 seconds
6 examples, 1 failure

Failed examples:

rspec ./spec/controllers/books_controller_spec.rb:25 # BooksController POST 'index' creates a new Book given valid attributes
rake aborted!
ruby /Users/rpowell93/.rvm/rubies/ruby-1.9.3-p0/bin/ruby -S rspec ./spec/controllers/books_controller_spec.rb ./spec/helpers/books_helper_spec.rb ./spec/models/book_spec.rb ./spec/views/books/index.html.erb_spec.rb ./spec/views/books/new.html.erb_spec.rb failed

Tasks: TOP => spec
(See full trace by running task with --trace)