* [Adding feature to top level container doesn't work](https://github.com/clicon/clixon/issues/322)

* Instead of removing YANG which is disabled by `if-feature`, replace it with an yang `anydata` node.
  * This means XML specified by such YANG is ignored, and it is not an error to access it
  * Note the similarity with `CLICON_YANG_UNKNOWN_ANYDATA`

test/test_feature_startup.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+# Yang features. if-feature.
+# The test has a example module with FEATURES A and B, where A is enabled and
+# Ignore dont throw error, see https://github.com/clicon/clixon/issues/322
+
+# Magic line must be first in script (see README.md)
+s="$_" ; . ./lib.sh || if [ "$s" = $0 ]; then exit 0; else return 0; fi
+
+APPNAME=example
+
+cfg=$dir/conf_yang.xml
+fyang=$dir/test.yang
+
+# Note ietf-routing@2018-03-13 assumed
+cat <<EOF > $cfg
+<clixon-config xmlns="http://clicon.org/config">
+  <CLICON_FEATURE>ietf-netconf:startup</CLICON_FEATURE>
+  <CLICON_CONFIGFILE>$cfg</CLICON_CONFIGFILE>
+  <CLICON_YANG_DIR>${YANG_INSTALLDIR}</CLICON_YANG_DIR>
+  <CLICON_YANG_MAIN_FILE>$fyang</CLICON_YANG_MAIN_FILE>
+  <CLICON_CLISPEC_DIR>/usr/local/lib/$APPNAME/clispec</CLICON_CLISPEC_DIR>
+  <CLICON_CLI_DIR>/usr/local/lib/$APPNAME/cli</CLICON_CLI_DIR>
+  <CLICON_CLI_MODE>$APPNAME</CLICON_CLI_MODE>
+  <CLICON_SOCK>/usr/local/var/$APPNAME/$APPNAME.sock</CLICON_SOCK>
+  <CLICON_BACKEND_PIDFILE>/usr/local/var/$APPNAME/$APPNAME.pidfile</CLICON_BACKEND_PIDFILE>
+  <CLICON_XMLDB_DIR>$dir</CLICON_XMLDB_DIR>
+</clixon-config>
+EOF
+
+cat <<EOF > $fyang
+module example{
+   yang-version 1.1;
+   namespace "urn:example:clixon";
+   prefix ex;
+
+   feature A{
+      description "This test feature is enabled";
+   }
+
+    grouping mytop {
+        container mycontainer {
+            if-feature A;
+            leaf myleaf {
+                type string;
+           }
+       }
+    }
+    uses mytop;
+}
+EOF
+
+cat<<EOF > $dir/startup_db
+<${DATASTORE_TOP}>
+     <mycontainer xmlns="urn:example:clixon">
+      <myleaf>boo</myleaf>
+   </mycontainer>
+</${DATASTORE_TOP}>
+EOF
+
+#
+testrun()
+{
+    opt=$1
+
+    new "kill old backend"
+    sudo clixon_backend -zf $cfg
+    if [ $? -ne 0 ]; then
+	err
+    fi
+
+    new "start backend -s startup -f $cfg"
+    start_backend -s startup ${opt} -f $cfg
+
+    new "wait backend"
+    wait_backend
+}
+
+
+new "test params: -f $cfg"
+
+new "enable feature A"
+testrun "-o CLICON_FEATURE=example:A"
+
+new "enable feature B, expect fail"
+testrun "-o CLICON_FEATURE=example:B"
+
+if [ $BE -ne 0 ]; then
+    new "kill old backend"
+    sudo clixon_backend -zf $cfg
+    if [ $? -ne 0 ]; then
+	err
+    fi
+    # kill backend
+    stop_backend -f $cfg
+fi
+
+unset ret
+
+endtest
+
+rm -rf $dir