index.html.haml

%h1 Listing invoices

%table
  %tr
    %th Amount
    %th Info

- for invoice in @invoices
  %tr
    %td= invoice.amount
    %td= invoice.info

    %td= link_to 'Show', invoice
    %td= link_to 'Edit', edit_invoice_path(invoice)
    %td= link_to 'Destroy', invoice, :confirm => 'Are you sure?', :method => :delete

%br

= link_to 'New invoice', new_invoice_path

invoices_controller_spec.rb

require File.expand_path(File.dirname(__FILE__) + '/../spec_helper')

describe InvoicesController do

  before(:each) do
    @invoice = Factory(:invoice)
  end

  describe "responding to GET index" do

    it "should expose all invoices as @invoices" do
      get :index
      assigns[:invoices].should == [@invoice]
    end

    describe "with mime type of xml" do
  
      it "should render all invoices as xml" do
        request.env["HTTP_ACCEPT"] = "application/xml"
        Invoice.should_receive(:find).with(:all).and_return(invoices = mock("Array of Invoices"))
        invoices.should_receive(:to_xml).and_return("generated XML")
        get :index
        response.body.should == "generated XML"
      end
    
    end

  end

  describe "responding to GET show" do

    it "should expose the requested invoice as @invoice" do
      get :show, :id => @invoice.id
      assigns[:invoice].should == @invoice
    end
    
    describe "with mime type of xml" do

      it "should render the requested invoice as xml" do
        request.env["HTTP_ACCEPT"] = "application/xml"
        Invoice.should_receive(:find).with("37").and_return(@invoice)
        @invoice.should_receive(:to_xml).and_return("generated XML")
        get :show, :id => "37"
        response.body.should == "generated XML"
      end

    end
    
  end

  describe "responding to GET new" do
  
    it "should expose a new invoice as @invoice" do
      invoice = Factory.build(:invoice)
      Invoice.should_receive(:new).and_return(invoice)
      get :new
      assigns[:invoice].should equal(invoice)
    end

  end

  describe "responding to GET edit" do
  
    it "should expose the requested invoice as @invoice" do
      get :edit, :id => @invoice.id
      assigns[:invoice].should == @invoice
    end

  end

  describe "responding to POST create" do

    before(:each) do
      @new_invoice = Factory.build(:invoice)
    end

    describe "with valid params" do

      it "should expose a newly created invoice as @invoice" do
        Invoice.should_receive(:new).with({'these' => 'params'}).and_return(@new_invoice)
        post :create, :invoice => {:these => 'params'}
        assigns(:invoice).should equal(@new_invoice)
      end

      it "should redirect to the created invoice" do
        Invoice.stub!(:new).and_return(@new_invoice)
        post :create, :invoice => {}
        response.should redirect_to(invoice_url(@new_invoice))
      end
      
    end
    
    describe "with invalid params" do

      before(:each) do
        @new_invoice.stub!(:save => false)
      end

      it "should expose a newly created but unsaved invoice as @invoice" do
        Invoice.stub!(:new).with({'these' => 'params'}).and_return(@new_invoice)
        post :create, :invoice => {:these => 'params'}
        assigns(:invoice).should equal(@new_invoice)
      end

      it "should re-render the 'new' template" do
        Invoice.stub!(:new).and_return(@new_invoice)
        post :create, :invoice => {}
        response.should render_template('new')
      end
      
    end
    
  end

  describe "responding to PUT update" do

    before(:each) do
      Invoice.should_receive(:find).with(@invoice.id.to_s).and_return(@invoice)
    end

    it "should update the requested invoice" do
      @invoice.should_receive(:update_attributes).with({'these' => 'params'})
      put :update, :id => @invoice.id, :invoice => {:these => 'params'}
    end

    describe "with valid params" do

      before(:each) do
        @invoice.stub!(:update_attributes => true)
      end

      it "should expose the requested invoice as @invoice" do
        put :update, :id => @invoice.id
        assigns(:invoice).should equal(@invoice)
      end

      it "should redirect to the invoice" do
        put :update, :id => @invoice.id
        response.should redirect_to(invoice_url(@invoice))
      end

    end
    
    describe "with invalid params" do

      before(:each) do
        @invoice.stub!(:update_attributes => false)
      end

      it "should expose the invoice as @invoice" do
        put :update, :id => @invoice.id
        assigns(:invoice).should equal(@invoice)
      end

      it "should re-render the 'edit' template" do
        put :update, :id => @invoice.id
        response.should render_template('edit')
      end

    end

  end

  describe "responding to DELETE destroy" do

    it "should destroy the requested invoice" do
      Invoice.should_receive(:find).with(@invoice.id.to_s).and_return(@invoice)
      @invoice.should_receive(:destroy)
      delete :destroy, :id => @invoice.id
    end
  
    it "should redirect to the invoices list" do
      delete :destroy, :id => @invoice.id
      response.should redirect_to(invoices_url)
    end

  end

end