Now after writing and building code, let's actually execute it! You can execute tests with:

$ wasm-pack test --firefox
[INFO]: Checking for the Wasm target...
    Finished dev [unoptimized + debuginfo] target(s) in 0.02s
     Running target/wasm32-unknown-unknown/debug/deps/web-9e7d380f8600b08e.wasm
Interactive browsers tests are now available at http://127.0.0.1:8000

Note that interactive mode is enabled because `NO_HEADLESS`
is specified in the environment of this process. Once you're
done with testing you'll need to kill this server with
Ctrl-C.

The console won't finish just yet, but as indicated you can visit http://127.0.0.1:8000 in your web browser to see the test output:

running 1 test

test web::pass ... ok

test result: ok. 1 passed; 0 failed; 0 ignored

and we've now executed our first tests in a web browser!

If you'd like to execute tests in a headless web browser (you don't need to manually visit a page) you can do:

$ wasm-pack test --headless --firefox

and similarly if you're developing a project for Node.js you can also execute wasm-pack test --nodejs to run tests in Node.

Be sure to see the testing reference documentation for other supported features as well!