Unexplicable InvalidURIError after controller testing

I was testing my Rails 5.0 application with the following code:

  test "destroy should require logged-in user" do
    assert_no_difference 'AtpSelection.count' do
      delete :destroy, params: { id: atp_selections(:selection_1) }
    end
    assert_redirected_to login_url
  end

but the test kept failing:

ERROR["test_destroy_should_require_logged-in_user", AtpSelectionsControllerTest, 1.9559332270000596]
 test_destroy_should_require_logged-in_user#AtpSelectionsControllerTest (1.96s)
URI::InvalidURIError:         URI::InvalidURIError: bad URI(is not URI?): http://www.example.com:80destroy

So, in order for the test to pass, I had to change my code using instead the following code:

  test "destroy should require logged-in user" do
    assert_no_difference 'AtpSelection.count' do
      delete atp_selection_path(atp_selections(:selection_1))
    end
    assert_redirected_to login_url
  end

I have no idea why I could not make the test pass calling delete directly on the controller action :destroy. I made this same choice in other tests I created before for other controllers and they succeed without raising errors.