Cargo can run your tests with the
cargo test command. Cargo looks for tests
to run in two places: in each of your
src files and any tests in
Tests in your
src files should be unit tests, and tests in
tests/ should be
integration-style tests. As such, you’ll need to import your crates into
the files in
Here's an example of running
cargo test in our package, which
currently has no tests:
$ cargo test Compiling regex v1.5.0 (https://github.com/rust-lang/regex.git#9f9f693) Compiling hello_world v0.1.0 (file:///path/to/package/hello_world) Running target/test/hello_world-9c2b65bbb79eabce running 0 tests test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
If our package had tests, we would see more output with the correct number of tests.
You can also run a specific test by passing a filter:
$ cargo test foo
This will run any test with
foo in its name.
cargo test runs additional checks as well. It will compile any
examples you’ve included and will also test the examples in your
documentation. Please see the testing guide in the Rust
documentation for more details.