[Core] ROOT-9712 increase coverage of missing dict checks to cover new features

looking for dictionaries of template types of unique_ptr, array, tuple recursively
and making sure that pointers and const qualifiers are properly treated.

Author: dpiparo

core/meta/test/CMakeLists.txt

@@ -1,4 +1,5 @@
 ROOT_ADD_GTEST(testStatusBitsChecker testStatusBitsChecker.cxx LIBRARIES Core)
 ROOT_ADD_GTEST(testHashRecursiveRemove testHashRecursiveRemove.cxx LIBRARIES Core)
 ROOT_ADD_GTEST(testTClass testTClass.cxx LIBRARIES Core)
-configure_file(stlDictCheck.h . COPYONLY)
+configure_file(stlDictCheck.h . COPYONLY)
+configure_file(stlDictCheckAux.h . COPYONLY)

core/meta/test/stlDictCheck.h

@@ -1,12 +1,30 @@
 #ifndef _DICT_CHECK_TEST_
 #define _DICT_CHECK_TEST_
 
+#include "stlDictCheckAux.h"
+
+#include <array>
 #include <memory>
 
+#ifdef __ROOTCLING__
+#pragma link C++ class A+;
+#pragma link C++ class B+;
+#endif
+
+
 struct A {
 };
+
+struct D {
+};
+
 struct B {
    std::unique_ptr<A> fA;
+   std::tuple<A, int, double*> fT;
+   std::array<int, 5> fArr;
+   std::array<const std::unique_ptr<C**const*>, 5> fArrPtr;
+   std::array<const std::unique_ptr<D**const*>, 5> fArrPtr2;
 };
 
 #endif
+

core/meta/test/stlDictCheckAux.h

@@ -0,0 +1,8 @@
+#ifndef _DICT_CHECK_TEST_AUX_
+#define _DICT_CHECK_TEST_AUX_
+
+struct C {
+};
+
+#endif
+

core/meta/test/testTClass.cxx

@@ -20,5 +20,5 @@ TEST(TClass, DictCheck)
       errMsg += ", ";
    }
 
-   EXPECT_TRUE(classesWithoutDictionary.IsEmpty()) << errMsg;
-}
+   EXPECT_STREQ(errMsg.c_str(), "Missing dictionary for C, ") << errMsg;
+}