chore: Improve the reauthorization requirement for Email Channel (#4753)

spec/models/channel/email_spec.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require Rails.root.join 'spec/models/concerns/reauthorizable_shared.rb'
+
+RSpec.describe Channel::Email do
+  let(:channel) { create(:channel_email) }
+
+  describe 'concerns' do
+    it_behaves_like 'reauthorizable'
+
+    context 'when prompt_reauthorization!' do
+      it 'calls channel notifier mail for email' do
+        admin_mailer = double
+        mailer_double = double
+        expect(AdministratorNotifications::ChannelNotificationsMailer).to receive(:with).and_return(admin_mailer)
+        expect(admin_mailer).to receive(:email_disconnect).with(channel.inbox).and_return(mailer_double)
+        expect(mailer_double).to receive(:deliver_later)
+        channel.prompt_reauthorization!
+      end
+    end
+  end
+
+  it 'has a valid name' do
+    expect(channel.name).to eq('Email')
+  end
+end