Add explicit tests for Pages replication through Geo

Original MR added general tests for replicating objects
with/without object storage and selective sync enabled,
this adds test explicitly for the Pages model.

ee/spec/models/ee/pages_deployment_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe PagesDeployment do
+  using RSpec::Parameterized::TableSyntax
+  include EE::GeoHelpers
+
+  let_it_be(:group) { create(:group) }
+  let_it_be(:project) { create(:project, group: group) }
+
+  describe '.replicables_for_current_secondary' do
+    where(:selective_sync_enabled, :object_storage_sync_enabled, :pages_object_storage_enabled, :synced_pages) do
+      true  | true  | true  | 5
+      true  | true  | false | 5
+      true  | false | true  | 0
+      true  | false | false | 5
+      false | true  | true  | 10
+      false | true  | false | 10
+      false | false | true  | 0
+      false | false | false | 10
+    end
+
+    with_them do
+      let(:secondary) do
+        node = build(:geo_node, sync_object_storage: object_storage_sync_enabled)
+
+        if selective_sync_enabled
+          node.selective_sync_type = 'namespaces'
+          node.namespaces = [group]
+        end
+
+        node.save!
+        node
+      end
+
+      before do
+        stub_current_geo_node(secondary)
+        stub_pages_object_storage(::Pages::DeploymentUploader) if pages_object_storage_enabled
+
+        create_list(:pages_deployment, 5, project: project)
+        create_list(:pages_deployment, 5, project: create(:project))
+      end
+
+      it 'returns the proper number of pages deployments' do
+        expect(described_class.replicables_for_current_secondary(1..described_class.last.id).count).to eq(synced_pages)
+      end
+    end
+  end
+end