Refactor domain expiration email

#186

spec/jobs/domain_expiration_email_job_spec.rb

@@ -0,0 +1,40 @@
+require 'rails_helper'
+
+RSpec.describe DomainExpirationEmailJob do
+  it 'queues the job' do
+    expect { described_class.perform_later }.to have_enqueued_job(described_class)
+  end
+
+  describe '#perform' do
+    let(:domain) { instance_double(Domain) }
+
+    before :example do
+      expect(Domain).to receive(:find).and_return(domain)
+    end
+
+    context 'when domain is expired' do
+      let(:message) { instance_double(ActionMailer::MessageDelivery) }
+
+      before :example do
+        allow(domain).to receive(:registered?).and_return(false)
+      end
+
+      it 'sends email notification' do
+        expect(DomainMailer).to receive(:expiration).with(domain: domain).and_return(message)
+        expect(message).to receive(:deliver!)
+        described_class.perform_now(domain_id: 1)
+      end
+    end
+
+    context 'when domain is registered' do
+      before :example do
+        allow(domain).to receive(:registered?).and_return(true)
+      end
+
+      it 'does not send email notification' do
+        expect(DomainMailer).to_not receive(:expiration)
+        described_class.perform_now(domain_id: 1)
+      end
+    end
+  end
+end