Fixed issues due to removed method in Ruby 3.2

app/models/export.rb

@@ -27,6 +27,6 @@ def build_filename
   private
 
   def delete_dump_file
-    File.delete(build_filename) if File.exists?(build_filename)
+    File.delete(build_filename) if File.exist?(build_filename)
   end
 end

app/views/pages/version.html.erb

@@ -6,7 +6,7 @@
   <dd class="col-md-10"><%= "#{Iqvoc.host_namespace} #{Iqvoc.host_version}" %></dd>
   <% end %>
 
-  <% if File.exists?(Rails.root.join('headrev.txt')) %>
+  <% if File.exist?(Rails.root.join('headrev.txt')) %>
     <dt class="col-md-2">Revision</dt>
     <dd class="col-md-10"><%= File.read(Rails.root.join('headrev.txt')) %></dd>
   <% end %>

test/integration/version_page_test.rb

@@ -0,0 +1,26 @@
+# Copyright 2011-2023 innoQ Deutschland GmbH
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+require File.join(File.expand_path(File.dirname(__FILE__)), '../integration_test_helper')
+
+class VersionPageTest < ActionDispatch::IntegrationTest
+
+  test 'visit version page' do
+    visit version_path(lang: 'de')
+
+    assert page.body.include? 'iQvoc core version:'
+    assert page.body.include? Iqvoc::VERSION
+  end
+
+end