template_controller_spec: add test for create action

spec/controllers/template_controller_spec.rb

@@ -2,9 +2,26 @@
 
 RSpec.describe TemplateController, type: :controller do
 
-  it "renders the index template" do
-    get :index
-    expect(response).to render_template("index")
+  context 'GET index' do
+    it "renders the index template" do
+      get :index
+      expect(response).to render_template("index")
+    end
+    it "is successful" do
+      get :index
+      expect(response.status).to eq(200)
+    end
+  end
+
+  context "POST create" do
+    it "renders the create template" do
+      post :create
+      expect(response).to render_template("create")
+    end
+    it "is successful" do
+      post :create
+      expect(response.status).to eq(200)
+    end
   end
 
 end