RSpec Tracer is a specs dependency analyzer, flaky tests detector, tests accelerator, and coverage reporter tool for RSpec. It maintains a list of files for each test, enabling itself to skip tests in the subsequent runs if none of the dependent files are changed. It uses Ruby's built-in coverage library to keep track of the coverage for each test.
Why do you think that https://github.com/cupakromer/emoji-rspec is a good alternative to RSpec Tracer