Move officing voters system test to controller test

As mentioned in the previous commit, checking the database after
starting the browser with the `visit` method sometimes results in
database corruption and failing tests on our CI due to the process
running the test accessing the database after the process running the
browser has started.

IMHO this is also a bad practice for system tests, since these tests
should be checking what users experience.

In this case, however, I haven't been able to test the user
experience since it looks like booths and officer assignments for voters
aren't shown anywhere.

So, since the purpose of the test was to check the database, and there
are other tests checking what happens after clicking the "Confirm vote"
button in the user interface, we're converting this test into a
controller test.

spec/controllers/officing/voters_controller_spec.rb

@@ -22,5 +22,44 @@ describe Officing::VotersController do
       expect(Poll::Voter.count).to eq 1
       expect(Poll::Voter.last.officer_id).to eq(officer.id)
     end
+
+    it "stores officer and booth information" do
+      officer = create(:poll_officer)
+      user = create(:user, :in_census)
+      poll1 = create(:poll, name: "Would you be interested in XYZ?")
+      poll2 = create(:poll, name: "Testing polls")
+
+      booth = create(:poll_booth)
+
+      assignment1 = create(:poll_booth_assignment, poll: poll1, booth: booth)
+      assignment2 = create(:poll_booth_assignment, poll: poll2, booth: booth)
+      create(:poll_shift, officer: officer, booth: booth, date: Date.current, task: :vote_collection)
+
+      validate_officer
+      set_officing_booth(booth)
+      sign_in(officer.user)
+
+      post :create, params: {
+        voter: { poll_id: poll1.id, user_id: user.id },
+        format: :js
+      }
+      expect(response).to be_successful
+
+      post :create, params: {
+        voter: { poll_id: poll2.id, user_id: user.id },
+        format: :js
+      }
+      expect(response).to be_successful
+
+      expect(Poll::Voter.count).to eq(2)
+
+      voter1 = Poll::Voter.first
+      expect(voter1.booth_assignment).to eq(assignment1)
+      expect(voter1.officer_assignment).to eq(assignment1.officer_assignments.first)
+
+      voter2 = Poll::Voter.last
+      expect(voter2.booth_assignment).to eq(assignment2)
+      expect(voter2.officer_assignment).to eq(assignment2.officer_assignments.first)
+    end
   end
 end