add post

spec/routing/posts_routing_spec.rb

@@ -0,0 +1,18 @@
+require "rails_helper"
+
+RSpec.describe PostsController, type: :routing do
+  describe "routing" do
+    it "routes to #index" do
+      expect(get: "/posts").to route_to("posts#index")
+    end
+
+    it "routes to #show" do
+      expect(get: "/posts/1").to route_to("posts#show", id: "1")
+    end
+
+
+    it "routes to #create" do
+      expect(post: "/posts").to route_to("posts#create")
+    end
+  end
+end