Add rack attack config for reset password

config/initializers/rack_attack.rb

@@ -0,0 +1,8 @@
+Rack::Attack.cache.store = ActiveSupport::Cache::MemoryStore.new
+Rack::Attack.enabled = false
+
+Rack::Attack.throttle("password reset requests", limit: 5, period: 60.seconds) do |request|
+  if request.params["user"].present? && request.path == "/users/password" && request.post?
+    request.params["user"]["email"].to_s.downcase.gsub(/\s+/, "")
+  end
+end

spec/requests/rack_attack_spec.rb

@@ -11,20 +11,24 @@ describe "Rack::Attack" do
   let(:notify_client) { instance_double(Notifications::Client) }
   let(:devise_notify_mailer) { DeviseNotifyMailer.new }
 
+  let(:params) { { user: { email: } } }
+  let(:user) { FactoryBot.create(:user) }
+  let(:email) { user.email }
+
   before do
-    Rack::Attack.enabled = false
+    Rack::Attack.enabled = true
     allow(DeviseNotifyMailer).to receive(:new).and_return(devise_notify_mailer)
     allow(devise_notify_mailer).to receive(:notify_client).and_return(notify_client)
     allow(notify_client).to receive(:send_email).and_return(true)
   end
 
-  context "when a regular user" do
-    let(:params) { { user: { email: } } }
-
-    context "when a password reset is requested for a valid email" do
-      let(:user) { FactoryBot.create(:user) }
-      let(:email) { user.email }
+  after do
+    Rack::Attack.enabled = false
+    Rack::Attack.reset!
+  end
 
+  context "when a password reset is requested" do
+    context "when the number of requests is under the throttle limit" do
       it "does not throttle" do
         under_limit.times do
           post "/users/password", params: params
@@ -34,5 +38,26 @@ describe "Rack::Attack" do
         expect(last_response.status).to eq(200)
       end
     end
+
+    context "when the number of requests is at the throttle limit" do
+      it "does not throttle" do
+        limit.times do
+          post "/users/password", params: params
+          follow_redirect!
+        end
+        last_response = response
+        expect(last_response.status).to eq(200)
+      end
+    end
+
+    context "when the number of requests is over the throttle limit" do
+      it "throttles" do
+        over_limit.times do
+          post "/users/password", params: params
+        end
+        last_response = response
+        expect(last_response.status).to eq(429)
+      end
+    end
   end
 end