The final point of installation of open CV is as follows:
"[optional] Running tests
Get the required test data from OpenCV extra repository.
For example git clone https://github.com/opencv/opencv_extra.git
set OPENCV_TEST_DATA_PATH environment variable to <path to opencv_extra/testdata>.
execute tests from build directory.
For example <cmake_build_dir>/bin/opencv_test_core"
What's the command for testing the software installation? I'm currently sitting in ../tesdata folder with no clue what command are they asking me to use.