Stricter validations for Enigma problem tags

app/models/enigma.rb

@@ -6,4 +6,5 @@ class Enigma < ApplicationRecord
     USER = "api.user.not_welcomed",
     DOCUMENTATION = "api.documentation.unread"
   ]
+  validates_inclusion_of :problem_tag, in: PROBLEM_TAGS
 end

spec/controllers/api/users/users_controller_spec.rb

@@ -130,8 +130,12 @@ describe Api::UsersController do
         expect(user.name).to eq("Frank")
         expect(user.email).to eq(email)
         expect(user.valid_password?("Password123")).to be_truthy
-        expect(user.device.enigmas.count).to eq(1)
-        expect(user.device.enigmas.first.problem_tag).to eq(Enigma::SEED_DATA)
+        expect(user.device.enigmas.count).to eq(4)
+        tags = user.device.enigmas.pluck(:problem_tag)
+        expect(tags).to include(Enigma::SEED_DATA)
+        expect(tags).to include(Enigma::TOUR)
+        expect(tags).to include(Enigma::USER)
+        expect(tags).to include(Enigma::DOCUMENTATION)
       end
     end
   end