add valid_enum tests

tests/dictionaries/80valid_enum_no_param/00-base.xml

@@ -0,0 +1,22 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail>
+    <variables>
+        <family name="general" mode="expert">
+            <variable name="mode_conteneur_actif" type="oui/non" description="No change">
+                <value>non</value>
+            </variable>
+        </family>
+        <family name="enumfam" mode="expert">
+            <variable name="enumvar" type="string" description="multi" help="bla bla bla">
+                <value>c</value>
+            </variable>
+        </family>
+        <separators/>
+    </variables>
+
+    <constraints>
+        <check name="valid_enum" target="enumvar"/>
+    </constraints>
+</rougail>
+<!-- vim: ts=4 sw=4 expandtab
+-->