fix nvhpc 25.9 compilation (#54)

Author: JorgeG94

src/testdrive.F90

@@ -286,6 +286,10 @@ end subroutine test_interface
     !> Collect all tests
     subroutine collect_interface(testsuite)
       import :: unittest_type
+#ifdef __NVCOMPILER_LLVM__
+      ! this is only an issue with nvhpc 25.9, possibly a bug in the compiler ! verify in next release
+      import :: test_interface
+#endif
 
       !> Collection of tests
       type(unittest_type), allocatable, intent(out) :: testsuite(:)