[ntuple] Add partial test for templated alias

In this case, we do not get the fully qualified type from TDataMember.

Author: hahnjo

tree/ntuple/v7/test/CustomStruct.hxx

@@ -93,11 +93,20 @@ public:
    T fMember;
 };
 
+template <typename T>
+struct EdmHashTrait {
+   using value_type = T;
+};
+
 template <int I>
 class EdmHash {
 public:
    typedef std::string value_type;
    value_type fHash;
+
+   template <typename T>
+   using value_typeT = typename EdmHashTrait<T>::value_type;
+   value_typeT<value_type> fHash2;
 };
 
 template <typename FirstT, typename SecondT = double>

tree/ntuple/v7/test/ntuple_type_name.cxx

@@ -208,10 +208,16 @@ TEST(RNTuple, TypeNameTemplatesNestedAlias)
    EXPECT_EQ("", hash->GetTypeAlias());
 
    const auto hashSubFields = hash->GetSubFields();
-   ASSERT_EQ(1, hashSubFields.size());
+   ASSERT_EQ(2, hashSubFields.size());
    EXPECT_EQ("fHash", hashSubFields[0]->GetFieldName());
    EXPECT_EQ("std::string", hashSubFields[0]->GetTypeName());
    EXPECT_EQ("EdmHash<1>::value_type", hashSubFields[0]->GetTypeAlias());
+
+   EXPECT_EQ("fHash2", hashSubFields[1]->GetFieldName());
+   EXPECT_EQ("std::string", hashSubFields[1]->GetTypeName());
+   // FIXME: This should really be EdmHash<1>::value_typeT<EdmHash<1>::value_type>, but this is the value we get from
+   // TDataMember::GetFullTypeName right now...
+   EXPECT_EQ("value_typeT<EdmHash<1>::value_type>", hashSubFields[1]->GetTypeAlias());
 }
 
 TEST(RNTuple, ContextDependentTypeNames)