GoogleTest PrintTo not getting called for a class

Question

I\'m having a rather strange problem telling googletest to print a certain class the way I want using PrintTo.
The class is a very simple 2D point, it is in a namespace

Answer 1

Problem is that you break the One Definition Rule (ODR) of one of the gtest function (probably template ::testing::PrintToString<MyNamespace::CPunto2D>(const MyNamespace::CPunto2D&)).

In one TU where you use ASSERT_EQ, void PrintTo(const MyNamespace::CPunto2D& pto, ::std::ostream* os) is not declared, so ::testing::PrintToString<MyNamespace::CPunto2D> uses the default printer.

In an other TU where you use ASSERT_EQ, you have void PrintTo(const MyNamespace::CPunto2D& pto, ::std::ostream* os) declared (and potentially defined), so ::testing::PrintToString<MyNamespace::CPunto2D> uses a version using your custom PrintTo.

That is a second different definition of the same function.

You have to make sure that each TU which uses ASSERT_EQ see the declaration of your custom PrintTo (as in CPunto2D's header).