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The CodeCrafters CLI is a command-line tool that allows you to run tests & view test results from your local machine. Using the CLI is faster than using Git since you don’t need to commit your changes to run tests. If you haven’t installed the CLI yet, read this. To use the CLI, navigate to a CodeCrafters repository on your local machine and run the codecrafters test command: 
codecrafters test
To run tests against all previous stages first, add the --previous flag: 
codecrafters test --previous
You should see logs like this: 
Running tests on your codebase. Streaming logs...

[compile]    Compiling redis-starter-rust v0.1.0 (/app)
[compile]     Finished release [optimized] target(s) in 1.20s
[compile] Compilation successful.

[stage-1] Running tests for Stage #1: Bind to a port
[stage-1] $ ./spawn_redis_server.sh
[stage-1] Connecting to port 6379...
[your_program] Logs from your program will appear here!
[stage-1] Looks like your program has terminated. A redis server is expected to be a long-running process.
[stage-1] Test failed (try setting 'debug: true' in your codecrafters.yml to see more details)

View stage instructions: https://app.codecrafters.io/courses/redis.
You can then make changes to your codebase and re-run the tests by running codecrafters test again. You don’t need to commit your changes using Git to run tests using the CLI.