[ONOS-6941] addition of derived identities search

Change-Id: Ibefb62de9c00fdc57cf67d6433b850ddecccfb7a
diff --git a/compiler/plugin/maven/src/test/resources/DerivedIdentity/DerivedIdentities.yang b/compiler/plugin/maven/src/test/resources/DerivedIdentity/DerivedIdentities.yang
new file mode 100644
index 0000000..379f832
--- /dev/null
+++ b/compiler/plugin/maven/src/test/resources/DerivedIdentity/DerivedIdentities.yang
@@ -0,0 +1,31 @@
+module IdentityTypedef {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix IdentityTypedef;
+
+    identity ref-address-family {
+
+    }
+
+    identity ipv4-address-family {
+        base ref-address-family;
+    }
+
+    identity ipv6-address-family {
+        base ref-address-family;
+    }
+
+    leaf tunnel {
+        type type15;
+    }
+
+    leaf-list network-ref {
+        type type15;
+    }
+
+    typedef type15 {
+        type identityref {
+            base ref-address-family;
+        }
+    }
+}
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