Add (very simple) spec for a ViewComponent component

- Add `ViewComponent::TestHelpers` to get the helper method `render_inline`
 - Use Capybara to expect some assertion

spec/components/example_component_spec.rb

@@ -0,0 +1,8 @@
+require "spec_helper"
+
+describe "ExampleComponent tests", type: :component do
+  it "displays the h1 with the given parameter" do
+    render_inline(ExampleComponent.new(title: "Hello")) { }
+    expect(page).to have_selector "h1", text: "Hello"
+   end
+end

spec/spec_helper.rb

@@ -74,6 +74,8 @@ require "paperclip/matchers"
 # Override setting in Spree engine: Spree::Core::MailSettings
 ActionMailer::Base.default_url_options[:host] = 'test.host'
 
+require "view_component/test_helpers"
+
 RSpec.configure do |config|
   # ## Mock Framework
   #
@@ -232,6 +234,8 @@ RSpec.configure do |config|
   # PerfTools::CpuProfiler.stop
   # end
   config.infer_spec_type_from_file_location!
+
+  config.include ViewComponent::TestHelpers, type: :component
 end
 
 FactoryBot.use_parent_strategy = false