The test command

When writing a book, you sometimes need to automate some tests. For example, The Rust Programming Book uses a lot of code examples that could get outdated. Therefore it is very important for them to be able to automatically test these code examples.

mdBook supports a test command that will run all available tests in a book. At the moment, only rustdoc tests are supported, but this may be expanded upon in the future.

Disable tests on a code block

rustdoc doesn’t test code blocks which contain the ignore attribute:

```rust,ignore
fn main() {}
```

rustdoc also doesn’t test code blocks which specify a language other than Rust:

```markdown
**Foo**: _bar_
```

rustdoc does test code blocks which have no language specified:

```
This is going to cause an error!
```

Specify a directory

The test command can take a directory as an argument to use as the book’s root instead of the current working directory.

mdbook test path/to/book

--library-path

The --library-path (-L) option allows you to add directories to the library search path used by rustdoc when it builds and tests the examples. Multiple directories can be specified with multiple options (-L foo -L bar) or with a comma-delimited list (-L foo,bar).

--dest-dir

The --dest-dir (-d) option allows you to change the output directory for the book. Relative paths are interpreted relative to the book’s root directory. If not specified it will default to the value of the build.build-dir key in book.toml, or to ./book.