How to run ctest after building my project with cmake

I want my tests to be launched each time my project is successfully built. And if some tests are broken I want my build to be broken too. By default I need to run tests manually by running ctest command. CTest can actually build project but I use IDE that invokes make to build sources. And make doesn't run tests.

I add this command to my root CMakeLists.txt file but it doesn't work.

add_custom_command(OUTPUT tests.txt 
                   POST_BUILD
                   COMMAND ctest --output-on-failure)

CMake doesn't return any errors and everything builds fine but my custom command doesn't invokes. How can I run something after each successful build in CMake?

Update:

My final solution is creating this macro:

macro(add_unit_test target target_test)
    set(UNIT_TEST_TARGETS ${UNIT_TEST_TARGETS} ${target_test} PARENT_SCOPE)
    add_test(target ${CMAKE_CURRENT_BINARY_DIR}/${target_test})
endmacro(add_unit_test)

It calls add_test and remembers test target in a list. Every test in a project added by this macro. In the root CMakeLists.txt I have this code:

add_custom_target( all_tests ALL
                   DEPENDS ${UNIT_TEST_TARGETS}
)
add_custom_command(TARGET all_tests
                   COMMENT "Run tests"
                   POST_BUILD COMMAND ctest ARGS --output-on-failure
                   WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
)

It creates custom target that depends on all unit tests in a project. Custom command is runs after all_tests target was built.

This form of add_custom_command will only execute if another CMake target has a dependency on "tests.txt". I assume that no other target has "tests.txt" as an input file, hence the custom command never runs.

I think you could use the second form of add_custom_command to achieve your goal; something like:

add_custom_command(TARGET MainTest
                   POST_BUILD
                   COMMAND ctest -C $<CONFIGURATION> --output-on-failure)