[CMake] cmake doesn't run all tests

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> hello,
>
> I have two modules in my CMake project:
>
> /root//
> //├── foo//
> //│   ├── CMakeLists.txt//
> //│   ├── src//
> //│   │   └── foo.c//
> //│   └── tests//
> //│       ├── foo_unit_test.c//
> //│       └── CMakeLists.txt//
> //├── CMakeLists.txt//
> //└── moo//
> //    ├── CMakeLists.txt//
> //    ├── src//
> //    │   └── moo.c//
> //    └── tests//
> //        ├── CMakeLists.txt//
> //        └── moo_unit_test.c//
> /
> my root project has:
>
> /enable_testing()//
> //
> //add_subdirectory(adder)//
> //add_subdirectory(viterbi_encoder)/
>
>
> and each module has:
>
> /add_subdirectory(tests)/
>
>
> For the tests I am using add_test() and make all test.
>
> yet, this only runs the tests within the first add_subdirectory. Other 
> modules are ignored.
>
> How can I run all tests at once?
>
> Thank you in advance.
>
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