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ruby-on-rails-4rspec-railsrspec3

Rspec Change Matcher and factory girl

I'm using factory girl to create my objects. I'm wondering why I have to do the following:

RSpec.describe V1::SlotsController, type: :controller do
  let(:valid_slot) { create(:slot) }
  let(:valid_attributes) { attributes_for(:slot) }

  describe "DELETE destroy" do
    it "destroys the requested slot" do
      slot = Slot.create! valid_attributes # not working without this line
      expect {
        delete :destroy, { id: slot.id }
      }.to change(Slot, :count).by(-1)
    end
  end
end

If I do not overwrite slot, and just use the one created by factory_girl, the test will not pass. Why that?

Solution

  • because let is "lazy loaded". You should use 

    let!(:slot) { create(:slot) }

describe "DELETE destroy" do
  it "destroys the requested slot" do
    expect {
      delete :destroy, { id: slot.id }
    }.to change(Slot, :count).by(-1)
  end
end