make sure API settings controller is loaded by declaring the API acronym (#8792)

config/initializers/inflections.rb

@@ -41,6 +41,7 @@
 
 # These inflection rules are supported but not enabled by default:
 ActiveSupport::Inflector.inflections(:en) do |inflect|
+  inflect.acronym "API"
   inflect.acronym 'OAuth'
   inflect.acronym 'OpenID'
 end

spec/features/admin/settings_spec.rb

@@ -0,0 +1,65 @@
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) 2012-2020 the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2017 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See docs/COPYRIGHT.rdoc for more details.
+#++
+
+require 'spec_helper'
+
+describe 'Settings', type: :feature do
+  let(:admin) { FactoryBot.create(:admin) }
+
+  describe 'subsection' do
+    before do
+      login_as(admin)
+
+      visit '/settings/api'
+    end
+
+    shared_examples "it can be visited" do
+      let(:section) { raise "define me" }
+
+      before do
+        visit "/settings/#{section}"
+      end
+
+      it "can be visited" do
+        expect(page).to have_content(/#{section}/i)
+      end
+    end
+
+    describe "general" do
+      it_behaves_like "it can be visited" do
+        let(:section) { "general" }
+      end
+    end
+
+    describe "API (regression #34938)" do
+      it_behaves_like "it can be visited" do
+        let(:section) { "api" }
+      end
+    end
+  end
+end