Hello, World!

A barebones project that just prints the text "Hello, World"!

Backstory

Imagine you want to make the simplest Rust project possible- just the stuff needed to make a Rust project run.

The idea here is that if you can write a Rust project that compiles, runs, and does something then you can build off this and create all the things you could ever imagine! 🌈

The Exercise

Write the simplest Rust project possible that prints some form of, "Hello, World!" to the console.

Tests

Here I have one maybe pointless unit test just checking that the main function returns nothing.

I also have an integration test which verifies that the text "Hello, world!" is printed to the console and that the prompt appears on a new line.

I'm also adding some other interesting testing tools such as:

• Running unit tests with a code coverage output

• Running mutation tests to test the unit tests

• Running fuzz tests to check for other unexpected behavior

Skills Practiced

• Installing and using cargo

• Creating a main function

• Creating an integration test

• Running a Rust project and tests

Dev Commands

Run cli tool locally:

cargo run

Formatting / linting:

cargo fmt
cargo clippy

Run unit & integration tests:

cargo test

Run Units Tests Wih Code Coverage:

cargo tarpaulin

Run Tests Automatically On Code Change (Aka "Watch Mode"):

bacon test

Run Mutation Testing:

cargo mutants

Deploy to Cargo & NPM:

• Increment version in Cargo.toml
• Sign in with cargo login and npm adduser

Then deploy (with -n flag for a different name):

rust-to-npm-cli deploy -b -n jimlynchcodes/01-hello-world-rs

To install via npm:

npm i -g @jimlynchcodes/hello-world-rs

Then run:

hello-world-rs