fix broken sprint wiki creation

modules/backlogs/app/models/sprint.rb

@@ -158,16 +158,15 @@ def impediments(project)
 
   private
 
-  def create_wiki_page(page_title)
+  def create_wiki_page(page_title, author: User.current)
     template = project.wiki.find_page(Setting.plugin_openproject_backlogs['wiki_template'])
     page_text = if template
                   "h1. #{name}\n\n#{template.text}"
                 else
                   "h1. #{name}"
                 end
 
-    page = project.wiki.pages.build(title: page_title)
-    page.build_content(text: page_text)
+    page = project.wiki.pages.build(title: page_title, text: page_text, author:)
     page.save!
   end
 end

modules/backlogs/spec/models/sprint_spec.rb

@@ -260,4 +260,27 @@
       end
     end
   end
+
+  describe '#wiki_page' do
+    let(:wiki) { create :wiki, project: }
+    let(:wiki_page) { WikiPage.where(wiki:, title: sprint.wiki_page).first }
+    let(:user) { create :user }
+
+    before do
+      sprint.project = project
+      sprint.save!
+    end
+
+    subject do
+      login_as user
+
+      sprint.wiki_page
+    end
+
+    it 'creates a new wiki page if none is present' do
+      expect { subject }.not_to raise_error
+
+      expect(wiki_page.text).to start_with("h1. #{sprint.name}")
+    end
+  end
 end