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I'm using cargo build --release to build my project in release configuration and cargo test to build and run my tests.
However, I'd like to also build my tests in release mode; can this be done using cargo?
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Target Selection. When no target selection options are given, cargo test will build the following targets of the selected packages: lib — used to link with binaries, examples, integration tests, and doc tests. bins (only if integration tests are built and required features are available)
The default behavior of the binary produced by cargo test is to run all the tests in parallel and capture output generated during test runs, preventing the output from being displayed and making it easier to read the output related to the test results.
Cargo resolves all dependencies of your project, downloads missing dependencies, and compiles it using the rustc compiler. By default, projects are built and compiled in debug mode. For information on compiling your project in release mode, see Building a Rust project in release mode. An existing Rust project.
Cargo stores the output of a build into the "target" directory. By default, this is the directory named target in the root of your workspace. To change the location, you can set the CARGO_TARGET_DIR environment variable, the build. target-dir config value, or the --target-dir command-line flag.
cargo test --release exists, but it is slightly different than just enabling optimizations. For example, debug assertions become disabled.
You can also set opt-level in the [profile.test] section of your Cargo.toml, as Viktor Dahl suggests.
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