diff --git a/test/functional/issues_controller_test.rb b/test/functional/issues_controller_test.rb
index b2033b3..66999ed 100644
--- a/test/functional/issues_controller_test.rb
+++ b/test/functional/issues_controller_test.rb
@@ -19,7 +19,7 @@ class IssuesControllerTest < RedmineIssueViewColumns::ControllerTest
   def setup
     prepare_tests
 
-    @global_settings = { 'column_names' => %w[created_on updated_on]}
+    @global_settings = { "column_names" => %w[created_on updated_on] }
   end
 
   def test_show_author_column_for_related_issues_with_project_setting
@@ -28,7 +28,7 @@ def test_show_author_column_for_related_issues_with_project_setting
     get :show, params: { id: issue.id }
 
     assert_response :success
-    assert_select '#relations td.author'
+    assert_select "#relations td.author"
   end
 
   def test_show_default_columns_for_related_issues_without_global_setting
@@ -37,14 +37,14 @@ def test_show_default_columns_for_related_issues_without_global_setting
 
     IssueRelation.create! issue_from: related_issue,
                           issue_to: issue,
-                          relation_type: 'relates'
+                          relation_type: "relates"
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns', issue_list_defaults: {} do
+    with_plugin_settings "redmine_issue_view_columns", issue_list_defaults: {} do
       get :show, params: { id: issue.id }
 
       assert_response :success
-      assert_select '#relations td.due_date'
+      assert_select "#relations td.due_date"
     end
   end
 
@@ -54,16 +54,16 @@ def test_show_custom_columns_for_related_issues_with_global_setting
 
     IssueRelation.create! issue_from: related_issue,
                           issue_to: issue,
-                          relation_type: 'relates'
+                          relation_type: "relates"
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns',
+    with_plugin_settings "redmine_issue_view_columns",
                          issue_list_defaults: @global_settings do
       get :show, params: { id: issue.id }
 
       assert_response :success
-      assert_select '#relations td.created_on'
-      assert_select '#relations td.updated_on'
+      assert_select "#relations td.created_on"
+      assert_select "#relations td.updated_on"
     end
   end
 
@@ -74,7 +74,7 @@ def test_show_author_column_for_subtasks_with_project_setting
     get :show, params: { id: issue.id }
 
     assert_response :success
-    assert_select '#issue_tree td.author'
+    assert_select "#issue_tree td.author"
   end
 
   def test_show_default_columns_for_subtasks_without_global_setting
@@ -82,12 +82,12 @@ def test_show_default_columns_for_subtasks_without_global_setting
     Issue.generate! project_id: 2, parent_issue_id: issue.id
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns',
+    with_plugin_settings "redmine_issue_view_columns",
                          issue_list_defaults: {} do
       get :show, params: { id: issue.id }
 
       assert_response :success
-      assert_select '#issue_tree td.due_date'
+      assert_select "#issue_tree td.due_date"
     end
   end
 
@@ -96,13 +96,13 @@ def test_show_custom_columns_for_subtasks_with_global_setting
     Issue.generate! project_id: 2, parent_issue_id: issue.id
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns',
+    with_plugin_settings "redmine_issue_view_columns",
                          issue_list_defaults: @global_settings do
       get :show, params: { id: issue.id }
 
       assert_response :success
-      assert_select '#issue_tree td.created_on'
-      assert_select '#issue_tree td.updated_on'
+      assert_select "#issue_tree td.created_on"
+      assert_select "#issue_tree td.updated_on"
     end
   end
 
@@ -112,16 +112,16 @@ def test_show_without_closed_relations
     related_issue = Issue.generate! project_id: 2, status_id: 1
     open_relation = IssueRelation.create! issue_from: related_issue,
                                           issue_to: issue,
-                                          relation_type: 'relates'
+                                          relation_type: "relates"
 
     closed_issue = Issue.generate! project_id: 2, status_id: 5
     closed_relation = IssueRelation.create! issue_from: closed_issue,
                                             issue_to: issue,
-                                            relation_type: 'relates'
+                                            relation_type: "relates"
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns',
-                         issue_scope: 'without_closed_by_default',
+    with_plugin_settings "redmine_issue_view_columns",
+                         issue_scope: "without_closed_by_default",
                          issue_list_defaults: @global_settings do
       get :show, params: { id: issue.id }
 
@@ -138,8 +138,8 @@ def test_show_without_closed_subtasks
     closed_issue = Issue.generate! project_id: 1, parent_issue_id: issue.id, status_id: 5
 
     @request.session[:user_id] = 1
-    with_plugin_settings 'redmine_issue_view_columns',
-                         issue_scope: 'without_closed_by_default',
+    with_plugin_settings "redmine_issue_view_columns",
+                         issue_scope: "without_closed_by_default",
                          issue_list_defaults: @global_settings do
       get :show, params: { id: issue.id }
 
@@ -159,7 +159,7 @@ def test_render_issue_tree_dir_file_model
     @request.session[:user_id] = 1
 
     with_plugin_settings "redmine_issue_view_columns",
-                         sort_dir_file_model: '1' do
+                         sort_dir_file_model: "1" do
       get :show, params: { id: parent_issue.id }
 
       assert_response :success
@@ -186,7 +186,7 @@ def test_render_issue_tree_default
     @request.session[:user_id] = 1
 
     with_plugin_settings "redmine_issue_view_columns",
-                         sort_dir_file_model: '0' do
+                         sort_dir_file_model: "0" do
       get :show, params: { id: parent_issue.id }
 
       assert_response :success
@@ -211,14 +211,14 @@ def test_min_width_setting_applies
     @request.session[:user_id] = 1
 
     with_plugin_settings "redmine_issue_view_columns",
-                         columns_min_width: 'Status:300px' do
+                         columns_min_width: "status:300px" do
       get :show, params: { id: issue.id }
 
       assert_response :success
 
-      assert_select "td.status", true, "Expected 'Status' column to be present"
+      assert_select "th.status", true, "Expected 'Status' column to be present"
 
-      style = css_select("td.status").first['style']
+      style = css_select("th.status").first["style"]
 
       # Ensure the style attribute contains the min-width property
       assert_match(/min-width:\s*300px/, style, "Expected 'Status' column to have min-width of 300px")
@@ -234,12 +234,12 @@ def test_sorting_criteria_and_order_for_columns
     @request.session[:user_id] = 1
 
     with_plugin_settings "redmine_issue_view_columns",
-                         columns_sorting: 'Status:ASC,Author:DESC' do
+                         columns_sorting: "status:ASC,author:DESC" do
       get :show, params: { id: parent_issue.id }
 
       assert_response :success
 
-      issue_rows = css_select('#issue_tree tr').map(&:to_html)
+      issue_rows = css_select("#issue_tree tr").map(&:to_html)
 
       issue_ids = issue_rows.map { |row| row[/id="issue-(\d+)"/, 1].to_i }
 
@@ -266,7 +266,7 @@ def test_collapsed_issue_is_not_displayed
 
     grandchild_issue_row = css_select("tr#issue-#{grandchild_issue.id}").first
 
-    style = grandchild_issue_row['style']
+    style = grandchild_issue_row["style"]
 
     # Check if the style attribute of children of issues included in collapsed_ids includes 'display: none'
     assert_match(/display:\s*none/, style, "Expected grandchild issue to have display: none")