Rails asset_host failure

result

Failure/Error: expect(helper.image_url("blah.jpg")).to eq("http://this-is-a-test.com/assets/blah.jpg")
       
       expected: "http://this-is-a-test.com/assets/blah.jpg"
            got: "http://test.hosthttp://this-is-a-test.com/assets/blah.jpg"
       
       (compared using ==)
       
       

test.rb

  describe "bug with image_url" do
    before do
      ActionController::Base.asset_host = 'this-is-a-test.com'
    end

    after do
      ActionController::Base.asset_host = nil
    end

    it "should return the correct urls" do
      expect(helper.image_url("blah.jpg")).to eq("http://this-is-a-test.com/assets/blah.jpg")
    end
  end