New to rspec

Hi all…
I am new to rspec. I am testing create action of communities_controller
in my application, which is below:
def create
@community = Community.new(params[:community])
@community.url_title = params[:community][:title].parameterize
@community.title = params[:community][:title].strip
@community.description = params[:community][:description].strip
@community.country_id = params[:referenceid][:country]
@community.state_id = params[:referenceid][:state]
@community.city_id = params[:referenceid][:city]
@community.user_id = current_user.id
respond_to do |format|
if @community.save
format.html { redirect_to :action => “show”, :id =>
@community.url_title}
format.xml { render :xml => @community, :status => :created,
:location => @community }
else
format.html { render :action => “new” }
format.xml { render :xml => @community.errors, :status =>
:unprocessable_entity }
end
end
end
My test cases are as below:

describe “POST create” do
describe “with valid params” do
it “assigns a newly created community as @community” do
Community.stub(:new).with({‘these’ => ‘params’}) {
mock_community(:save => true) }
post :create, :community => {‘these’ => ‘params’}
assigns(:community).should be(mock_community)
end

  it "redirects to the created community" do
    Community.stub(:new) { mock_community(:save => true) }
    post :create, :community => {}
    response.should redirect_to(community_url(mock_community))
  end
end

describe "with invalid params" do
  it "assigns a newly created but unsaved community as @community"

do
Community.stub(:new).with({‘these’ => ‘params’}) {
mock_community(:save => false) }
post :create, :community => {‘these’ => ‘params’}
assigns(:community).should be(mock_community)
end

  it "re-renders the 'new' template" do
    Community.stub(:new) { mock_community(:save => false) }
    post :create, :community => {}
    response.should render_template("new")
  end
end

end

I dont know how to test : @community.url_title =
params[:community][:title].parameterize
I am having following failure:
Failure/Error: post :create, :community => {‘these’ => ‘params’}
undefined method `parameterize’ for nil:NilClass
Please help me…

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