Add regression test for issues_helper#issue_header_actions_data

There was an issue where the output of the method had
booleans instead of strings. Data rendered in Haml for
the frontend should never contain booleans due to how
they are misleadingly rendered by Haml.

https://gitlab.com/gitlab-org/gitlab/-/issues/276785

spec/helpers/issues_helper_spec.rb

@@ -254,4 +254,31 @@ RSpec.describe IssuesHelper do
       expect(helper.use_startup_call?).to eq(true)
     end
   end
+
+  describe '#issue_header_actions_data' do
+    let(:current_user) { create(:user) }
+
+    before do
+      allow(helper).to receive(:current_user).and_return(current_user)
+      allow(helper).to receive(:can?).and_return(true)
+    end
+
+    it 'returns expected result' do
+      expected = {
+        can_create_issue: "true",
+        can_reopen_issue: "true",
+        can_report_spam: "false",
+        can_update_issue: "true",
+        iid: issue.iid,
+        is_issue_author: "false",
+        issue_type: "issue",
+        new_issue_path: new_project_issue_path(project),
+        project_path: project.full_path,
+        report_abuse_path: new_abuse_report_path(user_id: issue.author.id, ref_url: issue_url(issue)),
+        submit_as_spam_path: mark_as_spam_project_issue_path(project, issue)
+      }
+
+      expect(helper.issue_header_actions_data(project, issue, current_user)).to include(expected)
+    end
+  end
 end