Create build directory and run cmake in them with path to directory with CMakeLists.txt
mkdir build
cd build
cmake /path/to/uart_test_task
makeConnect uart bridge, find his tty-file location and run uart_echo_test. Example:
./uart_echo_test -d /dev/ttyUSB0 -b 115200 -m echoPrint --help arg to executable to find information about used flags
./uart_echo_test --helpcmake, gcc