FEATURE: plugins can register a custom admin quick start topic that will be seeded into new sites

spec/components/discourse_plugin_registry_spec.rb

@@ -43,6 +43,14 @@ describe DiscoursePluginRegistry do
     end
   end
 
+  context '#seed_data' do
+    it 'defaults to an empty Set' do
+      registry.seed_data = nil
+      expect(registry.seed_data).to be_a(Hash)
+      expect(registry.seed_data.size).to eq(0)
+    end
+  end
+
   context '.register_css' do
     before do
       registry_instance.register_css('hello.css')
@@ -143,4 +151,20 @@ describe DiscoursePluginRegistry do
     end
   end
 
+  context '#register_seed_data' do
+    let(:registry) { DiscoursePluginRegistry }
+
+    after do
+      registry.reset!
+    end
+
+    it "registers seed data properly" do
+      registry.register_seed_data("admin_quick_start_title", "Banana Hosting: Quick Start Guide")
+      registry.register_seed_data("admin_quick_start_filename", File.expand_path("../docs/BANANA-QUICK-START.md", __FILE__))
+
+      expect(registry.seed_data["admin_quick_start_title"]).to eq("Banana Hosting: Quick Start Guide")
+      expect(registry.seed_data["admin_quick_start_filename"]).to eq(File.expand_path("../docs/BANANA-QUICK-START.md", __FILE__))
+    end
+  end
+
 end