add test case for user count on about page

spec/controllers/static_controller_spec.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe StaticController, type: :controller do
+  describe "#about" do
+    subject { get :about }
+    
+    before(:each) {
+      User.create(screen_name: 'very_valid_user', confirmed_at: Time.now, answered_count: 1, asked_count: 1)
+      User.create(screen_name: 'big_ben', permanently_banned: true)
+      User.create(screen_name: 'youre_mom', banned_until: Time.now + 10.days)
+      User.create(screen_name: 'silence_fox', confirmed_at: Time.now)
+    }
+
+    it "shows the correct user count" do
+      subject
+      expect(assigns(:users)).to eq(1)
+    end
+  end
+end