Add TStatusBitsChecker.cxx gtest

core/meta/CMakeLists.txt

@@ -12,3 +12,6 @@ ROOT_OBJECT_LIBRARY(Meta ${sources})
 
 ROOT_INSTALL_HEADERS()
 
+if(testing)
+  add_subdirectory(test)
+endif()

core/meta/test/CMakeLists.txt

+ROOT_ADD_GTEST(testStatusBitsChecker testStatusBitsChecker.cxx LIBRARIES Core)

core/meta/test/testStatusBitsChecker.cxx

+#include "TStatusBitsChecker.h"
+
+#include "TClass.h"
+#include "TInterpreter.h"
+
+#include "gtest/gtest.h"
+
+const char* gCode = R"CODE(
+   struct ClassWithOverlap : public TObject {
+      enum EStatusBits {
+         kOverlappingBit = BIT(13)
+      };
+   };
+)CODE";
+
+void MakeClassWithOverlap() {
+   gInterpreter->Declare(gCode);
+}
+
+TEST(StatusBitsChecker,NoOverlap)
+{
+   EXPECT_TRUE(ROOT::Detail::TStatusBitsChecker::Check("TObject"));
+   EXPECT_TRUE(ROOT::Detail::TStatusBitsChecker::Check("TNamed"));
+   EXPECT_TRUE(ROOT::Detail::TStatusBitsChecker::Check("TStreamerElement"));
+}
+
+TEST(StatusBitsChecker,Overlap)
+{
+   MakeClassWithOverlap();
+   EXPECT_NE(nullptr,TClass::GetClass("ClassWithOverlap"));
+   EXPECT_FALSE(ROOT::Detail::TStatusBitsChecker::Check("ClassWithOverlap"));
+}