Add pagination to alerts index

spec/models/park_spec.rb

@@ -0,0 +1,15 @@
+require 'rails_helper'
+
+RSpec.describe Park, type: :model do
+  describe "#alerts" do
+    it "has alerts" do
+      expect(parks(:one).alerts).to eq([alerts(:one)])
+    end
+
+    it "destroys dependent alerts" do
+      expect do
+        parks(:one).destroy!
+      end.to change(Alert, :count).by(-1)
+    end
+  end
+end