Add Url helpers to previews (#1765)

* added url helpers to previews

* updated changelog

* fixed lint errors

* fixed lint errors

* fixed lint errors

* fixed lint errors

Author: reeganviljoen

docs/CHANGELOG.md

@@ -18,6 +18,10 @@ nav_order: 5
 
     *Pasha Kalashnikov*
 
+* Add URL helpers to previews
+
+    *Reegan Viljoen*
+
 ## 3.1.0
 
 * Check `defined?(Rails) && Rails.application` before using `ViewComponent::Base.config.view_component_path`.

lib/view_component/preview.rb

@@ -4,6 +4,7 @@
 
 module ViewComponent # :nodoc:
   class Preview
+    include Rails.application.routes.url_helpers
     include ActionView::Helpers::TagHelper
     include ActionView::Helpers::AssetTagHelper
     extend ActiveSupport::DescendantsTracker

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

@@ -0,0 +1 @@
+<a href="<%= @url %>" target="_blank">root</a>

test/sandbox/app/components/url_helper_component.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class UrlHelperComponent < ViewComponent::Base
+  def initialize(url: root_path)
+    @url = url
+  end
+end

test/sandbox/test/components/previews/url_helper_component_preview.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class UrlHelperComponentPreview < ViewComponent::Preview
+  def default
+    render(UrlHelperComponent.new(url: root_path))
+  end
+end

test/sandbox/test/components/render_preview_test.rb

@@ -12,4 +12,10 @@ def test_render_preview_from_class
 
     assert_selector("div", text: "hello,world!")
   end
+
+  def test_render_preview_with_url_helper
+    render_preview(:default, from: UrlHelperComponentPreview)
+
+    assert_selector("a[href='/']", text: "root")
+  end
 end