growstuff/spec/controllers/comments_controller_spec.rb

require 'spec_helper'

describe CommentsController do

  login_member

  def valid_attributes
    @post = FactoryGirl.create(:post)
    { :post_id => @post.id, :author_id => 1, :body => "some text" }
  end

  describe "GET index" do
    it "assigns all comments as @comments" do
      comment = Comment.create! valid_attributes
      get :index, {}
      assigns(:comments).should eq([comment])
    end
  end

  describe "GET RSS feed" do
    it "returns an RSS feed" do
      get :index, :format => "rss"
      response.should be_success
      response.should render_template("comments/index")
      response.content_type.should eq("application/rss+xml")
    end
  end

  describe "GET show" do
    it "assigns the requested comment as @comment" do
      comment = Comment.create! valid_attributes
      get :show, {:id => comment.to_param}
      assigns(:comment).should eq(comment)
    end
  end

  describe "GET new" do
    it "assigns a new comment as @comment" do
      get :new, {}
      assigns(:comment).should be_a_new(Comment)
    end

    it "picks up post from params" do
      post = FactoryGirl.create(:post)
      get :new, {:post_id => post.id}
      assigns(:post).should eq(post)
    end

    it "assigns the old comments as @comments" do
      post = FactoryGirl.create(:post)
      old_comment = FactoryGirl.create(:comment, :post => post)
      get :new, {:post_id => post.id}
      assigns(:comments).should eq [old_comment]
    end

    it "dies if no post specified" do
      get :new
      response.should redirect_to(root_url)
    end
  end

  describe "GET edit" do
    it "assigns the requested comment as @comment" do
      comment = Comment.create! valid_attributes
      get :edit, {:id => comment.to_param}
      assigns(:comment).should eq(comment)
    end

    it "assigns previous comments as @comments" do
      post = FactoryGirl.create(:post)
      old_comment = FactoryGirl.create(:comment, :post => post)
      comment = FactoryGirl.create(:comment, :post => post)
      get :edit, {:id => comment.to_param}
      assigns(:comments).should eq([comment, old_comment])
    end

  end

  describe "POST create" do
    describe "with valid params" do
      it "creates a new Comment" do
        expect {
          post :create, {:comment => valid_attributes}
        }.to change(Comment, :count).by(1)
      end

      it "assigns a newly created comment as @comment" do
        post :create, {:comment => valid_attributes}
        assigns(:comment).should be_a(Comment)
        assigns(:comment).should be_persisted
      end

      it "redirects to the created comment" do
        post :create, {:comment => valid_attributes}
        response.should redirect_to(Comment.last.post)
      end
    end

    describe "with invalid params" do
      it "assigns a newly created but unsaved comment as @comment" do
        # Trigger the behavior that occurs when invalid params are submitted
        Comment.any_instance.stub(:save).and_return(false)
        post :create, {:comment => { "post_id" => "invalid value" }}
        assigns(:comment).should be_a_new(Comment)
      end

      it "re-renders the 'new' template" do
        # Trigger the behavior that occurs when invalid params are submitted
        Comment.any_instance.stub(:save).and_return(false)
        post :create, {:comment => { "post_id" => "invalid value" }}
        response.should render_template("new")
      end
    end
  end

  describe "PUT update" do
    describe "with valid params" do
      it "updates the requested comment" do
        comment = Comment.create! valid_attributes
        # Assuming there are no other comments in the database, this
        # specifies that the Comment created on the previous line
        # receives the :update_attributes message with whatever params are
        # submitted in the request.
        Comment.any_instance.should_receive(:update_attributes).with({ "body" => "some text" })
        put :update, {:id => comment.to_param, :comment => { "body" => "some text" }}
      end

      it "assigns the requested comment as @comment" do
        comment = Comment.create! valid_attributes
        put :update, {:id => comment.to_param, :comment => valid_attributes}
        assigns(:comment).should eq(comment)
      end

      it "redirects to the comment" do
        comment = Comment.create! valid_attributes
        put :update, {:id => comment.to_param, :comment => valid_attributes}
        response.should redirect_to(comment.post)
      end
    end

    describe "with invalid params" do
      it "assigns the comment as @comment" do
        comment = Comment.create! valid_attributes
        # Trigger the behavior that occurs when invalid params are submitted
        Comment.any_instance.stub(:save).and_return(false)
        put :update, {:id => comment.to_param, :comment => { "post_id" => "invalid value" }}
        assigns(:comment).should eq(comment)
      end

      it "re-renders the 'edit' template" do
        comment = Comment.create! valid_attributes
        # Trigger the behavior that occurs when invalid params are submitted
        Comment.any_instance.stub(:save).and_return(false)
        put :update, {:id => comment.to_param, :comment => { "post_id" => "invalid value" }}
        response.should render_template("edit")
      end
    end
  end

  describe "DELETE destroy" do
    it "destroys the requested comment" do
      comment = Comment.create! valid_attributes
      expect {
        delete :destroy, {:id => comment.to_param}
      }.to change(Comment, :count).by(-1)
    end

    it "redirects to the post the comment was on" do
      comment = Comment.create! valid_attributes
      post = comment.post
      delete :destroy, {:id => comment.to_param}
      response.should redirect_to(post)
    end
  end

end