Add rendering to controller

lib/kangaru/controller.rb

@@ -1,13 +1,16 @@
 module Kangaru
   class Controller
-    attr_reader :command
+    attr_reader :command, :renderer
 
     def initialize(command)
       @command = command
+      @renderer = Renderer.new(command)
     end
 
     def execute
       public_send(command.action)
+
+      renderer.render(binding)
     end
   end
 end

sig/kangaru/controller.rbs

@@ -1,6 +1,7 @@
 module Kangaru
   class Controller
     attr_reader command: Command
+    attr_reader renderer: Renderer
 
     def initialize: (Command) -> void
 

spec/features/command_spec.rb

@@ -1,9 +1,11 @@
 RSpec.describe "Running a command", :with_gem do
+  subject(:run_command!) { SomeGem.run!(argv) }
+
+  let(:argv) { [] }
+
   include_context :kangaru_initialised
 
   describe "calling SomeGem.run! directly" do
-    subject(:run_command!) { SomeGem.run!(argv) }
-
     let(:target) do
       Module.new { def self.do_something = nil }
     end
@@ -266,4 +268,49 @@ def some_action
       end
     end
   end
+
+  describe "rendering view files" do
+    before do
+      gem.gem_file("default_controller").write(<<~RUBY)
+        module SomeGem
+          class DefaultController < Kangaru::Controller
+            def default
+              @name = "Some Name"
+              @age = 30
+            end
+          end
+        end
+      RUBY
+    end
+
+    context "when view file does not exist" do
+      before { gem.load! }
+
+      it "does not output to stdout" do
+        expect { run_command! }.not_to output.to_stdout
+      end
+    end
+
+    context "when view file exists" do
+      before do
+        gem.gem_dir("views").mkdir
+        gem.gem_dir("views/default").mkdir
+        gem.view_file(controller: "default", action: "default").write(view_file)
+
+        gem.load!
+      end
+
+      let(:view_file) do
+        <<~ERB
+          Hello <%= @name %>, you are <%= @age %> years old.
+        ERB
+      end
+
+      it "outputs the interpolated view file" do
+        expect { run_command! }.to output(<<~TEXT).to_stdout
+          Hello Some Name, you are 30 years old.
+        TEXT
+      end
+    end
+  end
 end

spec/kangaru/controller_spec.rb

@@ -7,10 +7,25 @@
 
   let(:action) { :some_action }
 
+  let(:renderer) { instance_spy(Kangaru::Renderer) }
+
+  before do
+    allow(Kangaru::Renderer).to receive(:new).and_return(renderer)
+  end
+
   describe "#initialize" do
     it "sets the command" do
       expect(controller.command).to eq(command)
     end
+
+    it "instantiates a renderer" do
+      controller
+      expect(Kangaru::Renderer).to have_received(:new).with(command).once
+    end
+
+    it "sets the renderer" do
+      expect(controller.renderer).to eq(renderer)
+    end
   end
 
   describe "#execute" do
@@ -30,6 +45,11 @@
       execute
       expect(controller).to have_received(action).once
     end
+
+    it "renders the command output" do
+      execute
+      expect(renderer).to have_received(:render).with(a_kind_of(Binding)).once
+    end
   end
 end