Add request specs for unsubscribe

spec/controllers/public/unsubscribes_controller_spec.rb

+require 'spec_helper'
+
+describe Public::UnsubscribesController do
+  let!(:user) { create :user, email: 'me@example.com' }
+
+  describe "show" do
+    it "responds with success" do
+      get :show, email: 'me@example', format: 'com'
+
+      assert_response :success
+    end
+  end
+
+  describe "create" do
+    it "unsubscribes the connected user" do
+      post :create, email: 'me@example', format: 'com'
+
+      assert user.reload.admin_email_unsubscribed_at
+    end
+  end
+end