diff --git a/spec/controllers/moderation/anonymous_block_controller_spec.rb b/spec/controllers/moderation/anonymous_block_controller_spec.rb
new file mode 100644
index 00000000..f2147756
--- /dev/null
+++ b/spec/controllers/moderation/anonymous_block_controller_spec.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe Moderation::AnonymousBlockController, :ajax_controller, type: :controller do
+  describe "#index" do
+    subject { get :index }
+
+    shared_examples_for "should render the page successfully" do
+      it "should render the page successfully" do
+        subject
+        expect(response).to have_rendered(:index)
+        expect(response).to have_http_status(200)
+      end
+    end
+
+    shared_examples_for "empty" do
+      it "should assign an empty result set" do
+        subject
+        expect(assigns(:anonymous_blocks)).to be_empty
+      end
+    end
+
+    context "when there are no anonymous blocks" do
+      include_examples "empty"
+      include_examples "should render the page successfully"
+    end
+
+    context "when there are some anonymous blocks set" do
+      before do
+        %w[a b c].each do |identifier|
+          AnonymousBlock.create!(identifier:)
+        end
+      end
+
+      it "should assign an result set" do
+        subject
+        expect(assigns(:anonymous_blocks).length).to eq(3)
+      end
+
+      include_examples "should render the page successfully"
+    end
+
+    context "when there are only anonymous blocks assigned for users" do
+      before do
+        user = FactoryBot.create(:user)
+        %w[a b c].each do |identifier|
+          AnonymousBlock.create!(user:, identifier:)
+        end
+      end
+
+      include_examples "empty"
+      include_examples "should render the page successfully"
+    end
+  end
+end