[Rails] how can I investigate when a rspec test fails?

For example:

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

I have the new template under app/views/sectors but the test says:

SectorsController POST create with invalid params re-renders the 'new' template
Failure/Error: response.should render_template("new")
expecting <"new"> but rendering with <"">

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