test: remove redundant code blocks and empty context in EventsPreloader spec

Author: jrhoads

spec/services/events_preloader_spec.rb

@@ -8,15 +8,6 @@
   let(:doi2) { create(:doi, client: client, doi: "10.1234/TEST2", aasm_state: "findable") }
   let(:doi3) { create(:doi, client: client, doi: "10.1234/TEST3", aasm_state: "findable") }
 
-  describe "#initialize" do
-    it "initializes preloaded_events for each DOI" do
-      dois = [doi1, doi2]
-      EventsPreloader.new(dois)
-
-      expect(doi1.preloaded_events).to eq([])
-      expect(doi2.preloaded_events).to eq([])
-    end
-
   describe "#initialize" do
     it "initializes preloaded_events for each DOI" do
       dois = [doi1, doi2]
@@ -35,10 +26,6 @@
       end
     end
 
-    context "with source and target events" do
-  end
-
-  describe "#preload!" do
     context "with source and target events" do
       let!(:reference_event) do
         create(:event_for_crossref, {