diff --git a/spec/controllers/discouraged_articles_controller_spec.rb b/spec/controllers/discouraged_articles_controller_spec.rb
new file mode 100644
index 0000000000..b73c0a2242
--- /dev/null
+++ b/spec/controllers/discouraged_articles_controller_spec.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe DiscouragedArticlesController, type: :controller do
+  describe 'GET #category_member?' do
+    it 'returns true when a category member exists' do
+      FactoryBot.create(:wikipedia_category_member, category_member: 'Example Article')
+      get :category_member?, params: { article_title: 'Example Article' }
+      expect(response).to have_http_status(:success)
+      expect(JSON.parse(response.body)['is_category_member']).to be_truthy
+    end
+
+    it 'returns false when a category member does not exist' do
+      get :category_member?, params: { article_title: 'Nonexistent Article' }
+      expect(response).to have_http_status(:success)
+      expect(JSON.parse(response.body)['is_category_member']).to be_falsey
+    end
+  end
+end
diff --git a/spec/factories/wikipedia_category_members.rb b/spec/factories/wikipedia_category_members.rb
index 4c76f9d268..6b9e5b5e10 100644
--- a/spec/factories/wikipedia_category_members.rb
+++ b/spec/factories/wikipedia_category_members.rb
@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 FactoryBot.define do
   factory :wikipedia_category_member do
-    category_members { "MyText" }
+    category_member { 'Example Category Member' }
   end
 end
diff --git a/spec/models/wikipedia_category_member_spec.rb b/spec/models/wikipedia_category_member_spec.rb
index ed30875283..2ad3d31c45 100644
--- a/spec/models/wikipedia_category_member_spec.rb
+++ b/spec/models/wikipedia_category_member_spec.rb
@@ -1,5 +1,35 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 
 RSpec.describe WikipediaCategoryMember, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  describe '#fetch_category_members' do
+    it 'fetches and saves category members' do
+      response = instance_double('response', status: 200,
+      data: { 'categorymembers' => [{ 'title' => 'Member 1' }, { 'title' => 'Member 2' }] })
+
+      wiki_api = instance_double('wiki_api', query: response)
+      allow(WikiApi).to receive(:new).and_return(wiki_api)
+
+      described_class.create(category_member: 'Member 2')
+      described_class.create(category_member: 'Member 3')
+
+      subject.fetch_category_members
+
+      expect(described_class.pluck(:category_member)).to contain_exactly('Member 1', 'Member 2')
+
+      expect(described_class.find_by(category_member: 'Member 3')).to be_nil
+    end
+
+    it 'logs a warning on API failure' do
+      response = instance_double('response', status: 500)
+
+      wiki_api = instance_double('wiki_api', query: response)
+      allow(WikiApi).to receive(:new).and_return(wiki_api)
+
+      expect(Rails.logger).to receive(:warn).with('Failed to fetch categorymembers data')
+
+      subject.fetch_category_members
+    end
+  end
 end
diff --git a/spec/workers/update_wikipedia_category_worker_spec.rb b/spec/workers/update_wikipedia_category_worker_spec.rb
new file mode 100644
index 0000000000..3f42c277c0
--- /dev/null
+++ b/spec/workers/update_wikipedia_category_worker_spec.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+require 'sidekiq/testing'
+
+Sidekiq::Testing.fake!
+
+RSpec.describe UpdateWikipediaCategoryWorker, type: :worker do
+  it 'fetches and saves Wikipedia category members' do
+    allow_any_instance_of(WikipediaCategoryMember).to receive(:fetch_category_members)
+
+    expect do
+      described_class.perform_async
+    end.to change(described_class.jobs, :size).by(1)
+
+    described_class.drain
+  end
+end