wasm-pack test command wraps the wasm-bindgen-test-runner
CLI allowing you to run wasm tests in different browsers without needing to install the different
wasm-pack test --help
wasm-pack test command can be given an optional path argument.
This path should point to a directory that contains a
Cargo.toml file. If no
path is given, the
test command will run in the current directory.
# Run tests for the current directory's crate
# Run tests for a specified crate
wasm-pack test crates/crate-in-my-workspace
test command accepts an optional profile argument:
If none is supplied, then a debug test build will be used.
Choose where to run your tests by passing in any combination of testing environment flags.
--headless is useful for running browser tests in a headless browser as part of a CI process.
wasm-pack test --node --firefox --chrome --safari --headless
test command can pass extra options straight to
cargo test even if they are not
supported in wasm-pack.
To use them simply add the extra arguments at the very end of your command, just
as you would for
cargo test -h for a list of all options that you can pass through.
When debugging a specific issue, you may find yourself wanting to run a subset of tests, instead of your entire suite of tests.
Here are a few examples of how to run a subset of your tests:
# Example directory structure
$ tree crates/foo
│ ├── diff
│ │ ├── diff_test_case.rs
│ │ └── mod.rs
│ ├── lib.rs
# Run all tests in tests/diff_patch.rs in Firefox
wasm-pack test crates/foo --firefox --headless --test diff_patch
# Run all tests in tests/diff_patch.rs that contain the word "replace"
wasm-pack test crates/foo --firefox --headless --test diff_patch replace
# Run all tests inside of a `tests` module inside of src/lib/diff.rs
wasm-pack test crates/foo --firefox --headless --lib diff::tests
# Same as the above, but only if they contain the word replace
wasm-pack test crates/foo --firefox --headless --lib diff::tests::replace
Note that you can also filter tests by location in which they're supposed to run. For example:
# Run all tests which are intended to execute in Node.js
wasm-pack test --node
# Run all tests which are intended to be executed in a browser
wasm-pack test --firefox --headless