Get rid of ModuleValuePair

It's better to use the identityRef_ struct instead of the pair.

Change-Id: I3122ac8320efdb2708d7d2e42b5be0053044ddc2
diff --git a/tests/leaf_editing.cpp b/tests/leaf_editing.cpp
index 64abbf2..986139d 100644
--- a/tests/leaf_editing.cpp
+++ b/tests/leaf_editing.cpp
@@ -37,11 +37,11 @@
     schema->addLeaf("/", "mod:leafUint32", yang::Uint32{});
     schema->addLeaf("/", "mod:leafUint64", yang::Uint64{});
     schema->addLeaf("/", "mod:leafBinary", yang::Binary{});
-    schema->addIdentity(std::nullopt, ModuleValuePair{"mod", "food"});
-    schema->addIdentity(std::nullopt, ModuleValuePair{"mod", "vehicle"});
-    schema->addIdentity(ModuleValuePair{"mod", "food"}, ModuleValuePair{"mod", "pizza"});
-    schema->addIdentity(ModuleValuePair{"mod", "food"}, ModuleValuePair{"mod", "spaghetti"});
-    schema->addIdentity(ModuleValuePair{"mod", "pizza"}, ModuleValuePair{"pizza-module", "hawaii"});
+    schema->addIdentity(std::nullopt, identityRef_{"mod", "food"});
+    schema->addIdentity(std::nullopt, identityRef_{"mod", "vehicle"});
+    schema->addIdentity(identityRef_{"mod", "food"}, identityRef_{"mod", "pizza"});
+    schema->addIdentity(identityRef_{"mod", "food"}, identityRef_{"mod", "spaghetti"});
+    schema->addIdentity(identityRef_{"mod", "pizza"}, identityRef_{"pizza-module", "hawaii"});
     schema->addLeaf("/", "mod:foodIdentRef", yang::IdentityRef{schema->validIdentities("mod", "food")});
     schema->addLeaf("/", "mod:pizzaIdentRef", yang::IdentityRef{schema->validIdentities("mod", "pizza")});
     schema->addLeaf("/mod:contA", "mod:identInCont", yang::IdentityRef{schema->validIdentities("mod", "pizza")});