Improve HTML rules & add one more HTML test

tests/eslint.test.config.js

@@ -40,10 +40,17 @@ module.exports = [
   },
   {
     // HTML linting (aside from erb_lint)
+    files: ["**/*.html", "**/*.html.erb"],
     processor: plugin.processors["processorHtml"],
     ...html.configs["flat/recommended"],
-    files: ["**/*.html", "**/*.html.erb"],
+    plugins: {
+      "@html-eslint": html,
+      "@stylistic": stylistic,
+    },
     rules: {
+      "@stylistic/eol-last": ["error", "always"],
+      "@stylistic/no-trailing-spaces": "error",
+      "@stylistic/no-multiple-empty-lines": ["error", { max: 1, maxEOF: 0 }],
       ...html.configs["flat/recommended"].rules,
       // 🎈 Best Practices
       "@html-eslint/no-extra-spacing-text": "error",

tests/fixtures/if-else.expected.html

@@ -0,0 +1,16 @@
+<div class="card-body scrollable">
+  <% if current_user.admin? %>
+  <div id="new-course-area" class="bg-green-lighten-4 p-3 mb-3 rounded" style="display: none;">
+    <%= render partial: 'courses/new',
+                   locals: { course: Course.new } %>
+  </div>
+  <% end %>
+  <% if current_user.edited_courses.any? %>
+  <%= render partial: 'administration/index/courses_card',
+                 locals: { courses:
+                             current_user.edited_courses
+                                         .natural_sort_by(&:title) } %>
+  <% else %>
+  <%= t('admin.main.no_edited_courses') %>
+  <% end %>
+</div>

tests/fixtures/if-else.html

@@ -0,0 +1,18 @@
+<div class="card-body scrollable">
+    <% if current_user.admin? %>
+      <div id="new-course-area"
+           class="bg-green-lighten-4 p-3 mb-3 rounded"
+           style="display: none;">
+        <%= render partial: 'courses/new',
+                   locals: { course: Course.new } %>
+      </div>
+    <% end %>
+    <% if current_user.edited_courses.any? %>
+      <%= render partial: 'administration/index/courses_card',
+                 locals: { courses:
+                             current_user.edited_courses
+                                         .natural_sort_by(&:title) } %>
+    <% else %>
+      <%= t('admin.main.no_edited_courses') %>
+    <% end %>
+  </div>

tests/fixtures/multiple-attributes.html

@@ -6,3 +6,5 @@
               data-id="<%= lecture.id %>">
         <%= t("buttons.discard") %>
 </button>
+
+