How to write tests for types with optional features in this crate in Rust.

May 19, 202365

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In Rust, you can use the cfg_attr attribute and #[cfg(feature = "feature_name")] attribute to write tests with optional features in your crate. The example provided shows how to define a struct and a test that will only be enabled if the "feature_name" feature is enabled. To run the test, you need to use the command "cargo test --features feature_name" where "my_crate" is the name of your crate. This command will enable the "feature_name" feature and run all tests, including those dependent on this feature.

In Rust, if you want to write tests with optional features for types in your crate, you can use the cfg_attr attribute and the #[cfg(feature = "feature_name")] attribute to achieve this.

Here is an example:

// In lib.rs or main.rs
#[cfg(feature = "feature_name")]
pub struct MyStruct {
    // ...
}

#[cfg(test)]
mod tests {
    #[test]
    #[cfg(feature = "feature_name")]
    fn test_my_struct() {
        // Write your test here
    }
}

In this example, MyStruct is only defined when feature_name is enabled, and similarly, the test_my_struct test is only run when feature_name is enabled.

To run this test, you need to use the following command, where my_crate is the name of your crate:

cargo test --features feature_name

This command enables the feature_name feature and runs all tests, including those that depend on this feature.