Upgrade to Ruby 2.7.

created from upstream commit: 9c8f75084ec39957bca57da8c9e178855baa31ea

test/run

@@ -6,7 +6,7 @@
 # IMAGE_NAME specifies a name of the candidate image used for testing.
 # The image has to be available before this script is executed.
 #
-IMAGE_NAME=${IMAGE_NAME-centos/ruby-26-centos7-candidate}
+IMAGE_NAME=${IMAGE_NAME-centos/ruby-27-centos7-candidate}
 
 declare -a WEB_SERVERS=(db puma rack)
 #declare -a WEB_SERVERS=(db)
@@ -175,12 +175,26 @@ for server in ${WEB_SERVERS[@]}; do
   test_scl_usage "ruby --version" "ruby ${RUBY_VERSION}."
   check_result $?
 
+  info "Testing npm availibility"
+  ct_npm_works
+  check_result $?
+
   info "All tests for the ${server}-test-app finished successfully."
   cleanup ${server}
 done
 
-info "Testing npm availibility"
-ct_npm_works
-check_result $?
+if [ "$OS" == "rhel7" ] || [ "$OS" == "centos7" ]; then
+  # autocleanup only enabled here as only the following tests so far use it
+   CID_FILE_DIR=$(mktemp -d)
+   ct_enable_cleanup
+
+   info "Testing variable presence during \`docker exec\`"
+   ct_check_exec_env_vars
+   check_result $?
+
+   info "Checking if all scl variables are defined in Dockerfile"
+   ct_check_scl_enable_vars
+   check_result $?
+fi
 
 info "All tests finished successfully."