test: Add a test for the posting check in

WcaOnRails/spec/requests/admin_results_spec.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+RSpec.describe "Admin Results" do
+  describe "Posting Check In" do
+    let!(:competition) { FactoryBot.create :competition, :with_valid_submitted_results }
+    let!(:wrt_member) { FactoryBot.create :user, :wrt_member }
+
+    it "locks a competition and returns the correct attributes" do
+      sign_in wrt_member
+      post start_posting_path, params: {
+        'competition_ids' => [competition.id],
+      }
+      expect(response).to be_successful
+      response_json = JSON.parse(response.body)
+      expect(response_json["message"]).to eq "Competitions successfully locked, go on posting!"
+      get results_posting_dashboard_path(format: :json)
+      expect(response).to be_successful
+      competitions = JSON.parse(response.body)["competitions"]
+      expect(competitions.size).to eq 1
+      expect(competitions[0]["id"]).to eq competition.id
+      expect(competitions[0]["posting_user"]["id"]).to eq wrt_member.id
+    end
+  end
+end