Add HamService unit tests

spec/services/spam/ham_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Spam::HamService do
+  let_it_be(:user) { create(:user) }
+  let!(:spam_log) { create(:spam_log, user: user, submitted_as_ham: false) }
+  let(:fake_akismet_service) { double(:akismet_service) }
+
+  subject { described_class.new(spam_log) }
+
+  before do
+    allow(Spam::AkismetService).to receive(:new).and_return fake_akismet_service
+  end
+
+  describe '#mark_as_ham!' do
+    context 'AkismetService returns false (Akismet cannot be reached, etc)' do
+      before do
+        allow(fake_akismet_service).to receive(:submit_ham).and_return false
+      end
+
+      it 'returns false' do
+        expect(subject.mark_as_ham!).to be_falsey
+      end
+
+      it 'does not update the record' do
+        expect { subject.mark_as_ham! }.not_to change { spam_log.submitted_as_ham }
+      end
+
+      context 'if spam log record has already been marked as spam' do
+        before do
+          spam_log.update_attribute(:submitted_as_ham, true)
+        end
+
+        it 'does not update the record' do
+          expect { subject.mark_as_ham! }.not_to change { spam_log.submitted_as_ham }
+        end
+      end
+    end
+
+    context 'Akismet ham submission is successful' do
+      before do
+        spam_log.update_attribute(:submitted_as_ham, false)
+        allow(fake_akismet_service).to receive(:submit_ham).and_return true
+      end
+
+      it 'returns true' do
+        expect(subject.mark_as_ham!).to be_truthy
+      end
+
+      it 'updates the record' do
+        expect { subject.mark_as_ham! }.to change { spam_log.submitted_as_ham }.from(false).to(true)
+      end
+    end
+  end
+end