No tests defined for the extension

I wrote an XS wrapper around some C code and package it as a CPAN module, call it "Foo". The original C source is in src/

and after perlxstut that the directory has its own Makefile.PL.

The result of "make test" now looks like this: "No tests defined for the Foo extension" warning that I would like to get rid of:

All tests successful.
Files=1, Tests=28,  0 wallclock secs ( 0.01 usr  0.00 sys +  0.04 cusr  0.00 csys =  0.05 CPU)
Result: PASS
make[1]: Entering directory `/path/to/Foo/src'
No tests defined for Foo extension.
make[1]: Leaving directory `/path/to/Foo/src'

      

        
        
        
      

    

The bits in the generated Makefile that run look like this:

subdirs-test ::
    $(NOECHO) $(NOOP)

subdirs-test ::
    $(NOECHO) cd src && $(MAKE) test $(PASTHRU)

      

        
        
        
      

    

But I cannot find that I am creating a second one, or how to stop it.

What am I missing?