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Merge pull request #1435 from phil-opp/blog-test-true

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Update testing post to set `test = true` in Cargo.toml
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Philipp Oppermann
2025-08-26 16:41:16 +02:00
committed by GitHub
parent a539c3b814 33b7979468
commit b3e0b5e139
1 changed files with 16 additions and 1 deletions
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blog/content/edition-2/posts/04-testing/index.md
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@@ -38,7 +38,22 @@ Rust has a [built-in test framework] that is capable of running unit tests witho
[built-in test framework]: https://doc.rust-lang.org/book/ch11-00-testing.html
Unfortunately, it's a bit more complicated for `no_std` applications such as our kernel. The problem is that Rust's test framework implicitly uses the built-in [`test`] library, which depends on the standard library. This means that we can't use the default test framework for our `#[no_std]` kernel.
To enable testing for our kernel binary, we can set the `test` flag in the Cargo.toml to `true`:
```toml
# in Cargo.toml
[[bin]]
name = "blog_os"
test = true
bench = false
```
This [`[[bin]]` section](https://doc.rust-lang.org/cargo/reference/cargo-targets.html#configuring-a-target) specifies how `cargo` should compile our `blog_os` executable.
The `test` field specifies whether testing is supported for this executable.
We set `test = false` in the first post to [make `rust-analyzer` happy](@/edition-2/posts/01-freestanding-rust-binary/index.md#making-rust-analyzer-happy), but now we want to enable testing, so we set it back to `true`.
Unfortunately, testing is a bit more complicated for `no_std` applications such as our kernel. The problem is that Rust's test framework implicitly uses the built-in [`test`] library, which depends on the standard library. This means that we can't use the default test framework for our `#[no_std]` kernel.
[`test`]: https://doc.rust-lang.org/test/index.html