test: Add cached component render tests

Author: JWShuff

test/sandbox/app/components/cache_component.html.erb

@@ -1,2 +1,2 @@
 <p class='cache-component__cache-key'><%= view_cache_dependencies %></p>
-<p class='cache-component__cache-message'><%= "#{foo} #{bar}" %></p>
+<p class='cache-component__cache-message' data-time=data-time="<%= Time.zone.now %>"><%= "#{foo} #{bar}" %></p>

test/sandbox/app/controllers/integration_examples_controller.rb

@@ -11,6 +11,12 @@ def controller_inline
     render(ControllerInlineComponent.new(message: "bar"))
   end
 
+  def controller_inline_cached
+    foo = params[:foo] || "foo"
+    bar = params[:bar] || "bar"
+    render(CacheComponent.new(foo:, bar:))
+  end
+
   def controller_inline_with_block
     render(ControllerInlineWithBlockComponent.new(message: "bar").tap do |c|
       c.with_slot(name: "baz")

test/sandbox/config/routes.rb

@@ -11,6 +11,7 @@
   get :inline_products, to: "integration_examples#inline_products"
   get :cached, to: "integration_examples#cached"
   get :render_check, to: "integration_examples#render_check"
+  get :controller_inline_cached, to: "integration_examples#controller_inline_cached"
   get :controller_inline, to: "integration_examples#controller_inline"
   get :controller_inline_with_block, to: "integration_examples#controller_inline_with_block"
   get :controller_inline_baseline, to: "integration_examples#controller_inline_baseline"

test/sandbox/test/integration_test.rb

@@ -261,6 +261,26 @@ def test_rendering_component_with_caching
     Rails.cache.clear
   end
 
+  def test_rendering_cached_component
+    Rails.cache.clear
+    ActionController::Base.perform_caching = true
+
+    get "/controller_inline_cached"
+    assert_response :success
+    body = response.body
+    assert_select('.cache-component__cache-message', text: "foo bar")
+
+    get "/controller_inline_cached?foo=laser&bar=beams"
+    assert(response.body != body)
+    assert_select('.cache-component__cache-message', text: "laser beams")
+
+    get "/controller_inline_cached"
+    assert(response.body === body)
+
+    ActionController::Base.perform_caching = false
+    Rails.cache.clear
+  end
+
   def test_optional_rendering_component_depending_on_request_context
     get "/render_check"
     assert_response :success

test/sandbox/test/rendering_test.rb

@@ -1217,16 +1217,20 @@ def test_with_format
   end
 
   def test_cache_component
+    require 'pry'
     component = CacheComponent.new(foo: "foo", bar: "bar")
     render_inline(component)
 
+    binding.pry
     assert_selector(".cache-component__cache-key", text: component.view_cache_dependencies)
     assert_selector(".cache-component__cache-message", text: "foo bar")
 
+    # Is this really testing caching?
     render_inline(CacheComponent.new(foo: "foo", bar: "bar"))
 
     assert_selector(".cache-component__cache-key", text: component.view_cache_dependencies)
 
+    # Now we use Foo, Baz and the original component hasn't changed.
     render_inline(CacheComponent.new(foo: "foo", bar: "baz"))
 
     refute_selector(".cache-component__cache-key", text: component.view_cache_dependencies)