Have node / npm installed.
Once in root of directory (i.e. pwd is mocha-webdriverio-parallel)
./run_tests.sh
Put in desired browser / os configurations in configurations.yaml.
Ruby script (splitter.rb) is used to create multiple files from one test case file. A new file will be created in split_testcase_dir that has desiredCapability read from configuration.yaml.
parallel-mocha is used to run all those tests in parallel.