Add skip link support for custom HTML and classes

app/helpers/govuk_skip_link_helper.rb

@@ -1,6 +1,11 @@
 module GovukSkipLinkHelper
-  def govuk_skip_link(text: 'Skip to main content', href: '#main-content')
-    link_to text, href, class: 'govuk-skip-link'
+  def govuk_skip_link(text: 'Skip to main content', href: '#main-content', classes: [], **html_attributes, &block)
+    link_classes = Array.wrap(classes).append('govuk-skip-link')
+
+    return link_to(href, class: link_classes, **html_attributes, &block) if block_given?
+
+    link_to(text, href, class: link_classes, **html_attributes)
   end
 end
+
 ActiveSupport.on_load(:action_view) { include GovukSkipLinkHelper }

spec/helpers/govuk_skip_link_helper_spec.rb

@@ -1,6 +1,7 @@
 require 'spec_helper'
 
 RSpec.describe(GovukSkipLinkHelper, type: 'helper') do
+  include ActionView::Context
   include ActionView::Helpers::UrlHelper
 
   let(:custom_link_text) { 'Get straight to the important stuff' }
@@ -16,7 +17,7 @@
     end
 
     context 'when text provided' do
-      subject { govuk_skip_link text: custom_link_text }
+      subject { govuk_skip_link(text: custom_link_text) }
       it { is_expected.to have_tag('a', with: { href: default_href, class: 'govuk-skip-link' }, text: custom_link_text) }
     end
 
@@ -26,8 +27,40 @@
     end
 
     context 'when href provided' do
-      subject { govuk_skip_link href: custom_href }
+      subject { govuk_skip_link(href: custom_href) }
       it { is_expected.to have_tag('a', with: { href: custom_href, class: 'govuk-skip-link' }, text: default_link_text) }
     end
+
+    describe 'extra classes' do
+      context 'when supplied with extra classes as a string' do
+        let(:custom_classes) { 'pink' }
+        subject { govuk_skip_link(classes: custom_classes) }
+        it { is_expected.to have_tag('a', with: { href: default_href, class: %w(govuk-skip-link).append(custom_classes) }, text: default_link_text) }
+      end
+
+      context 'when supplied with extra classes as an array' do
+        let(:custom_classes) { %w(yellow spots) }
+        subject { govuk_skip_link(classes: custom_classes) }
+        it { is_expected.to have_tag('a', with: { href: default_href, class: %w(govuk-skip-link).append(custom_classes) }, text: default_link_text) }
+      end
+    end
+
+    describe 'custom html attributes' do
+      let(:custom_attributes) { { lang: "en-GB", data: { awesome: "yes" } } }
+      subject { govuk_skip_link(**custom_attributes) }
+      it { is_expected.to have_tag('a', with: { href: default_href, lang: "en-GB", "data-awesome" => "yes" }, text: default_link_text) }
+    end
+
+    describe 'custom HTML' do
+      let(:custom_text) { "skip to the content" }
+      let(:custom_class) { "yellow" }
+      subject { govuk_skip_link { tag.span(custom_text, class: custom_class) } }
+
+      it "inserts the custom HTML into the anchor element" do
+        expect(subject).to have_tag('a', with: { href: default_href }) do
+          with_tag('span', with: { class: "yellow" }, text: custom_text)
+        end
+      end
+    end
   end
 end