292 lines
19 KiB
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292 lines
19 KiB
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<main>
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<h1 id="the-test-command"><a class="header" href="#the-test-command">The test command</a></h1>
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<p>When writing a book, you sometimes need to automate some tests. For example,
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<a href="https://doc.rust-lang.org/stable/book/">The Rust Programming Book</a> uses a lot
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of code examples that could get outdated. Therefore it is very important for
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them to be able to automatically test these code examples.</p>
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<p>mdBook supports a <code>test</code> command that will run all available tests in a book. At
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the moment, only Rust tests are supported.</p>
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<h4 id="disable-tests-on-a-code-block"><a class="header" href="#disable-tests-on-a-code-block">Disable tests on a code block</a></h4>
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<p>rustdoc doesn't test code blocks which contain the <code>ignore</code> attribute:</p>
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<pre><code>```rust,ignore
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fn main() {}
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```
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</code></pre>
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<p>rustdoc also doesn't test code blocks which specify a language other than Rust:</p>
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<pre><code>```markdown
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**Foo**: _bar_
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```
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</code></pre>
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<p>rustdoc <em>does</em> test code blocks which have no language specified:</p>
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<pre><code>```
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This is going to cause an error!
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```
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</code></pre>
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<h4 id="specify-a-directory"><a class="header" href="#specify-a-directory">Specify a directory</a></h4>
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<p>The <code>test</code> command can take a directory as an argument to use as the book's root
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instead of the current working directory.</p>
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<pre><code class="language-bash">mdbook test path/to/book
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</code></pre>
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<h4 id="--library-path"><a class="header" href="#--library-path">--library-path</a></h4>
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<p>The <code>--library-path</code> (<code>-L</code>) option allows you to add directories to the library
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search path used by <code>rustdoc</code> when it builds and tests the examples. Multiple
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directories can be specified with multiple options (<code>-L foo -L bar</code>) or with a
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comma-delimited list (<code>-L foo,bar</code>). The path should point to the Cargo
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<a href="https://doc.rust-lang.org/cargo/guide/build-cache.html">build cache</a> <code>deps</code> directory that
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contains the build output of your project. For example, if your Rust project's book is in a directory
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named <code>my-book</code>, the following command would include the crate's dependencies when running <code>test</code>:</p>
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<pre><code class="language-shell">mdbook test my-book -L target/debug/deps/
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</code></pre>
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<p>See the <code>rustdoc</code> command-line <a href="https://doc.rust-lang.org/rustdoc/command-line-arguments.html#-l--library-path-where-to-look-for-dependencies">documentation</a>
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for more information.</p>
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<h4 id="--dest-dir"><a class="header" href="#--dest-dir">--dest-dir</a></h4>
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<p>The <code>--dest-dir</code> (<code>-d</code>) option allows you to change the output directory for the
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book. Relative paths are interpreted relative to the book's root directory. If
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not specified it will default to the value of the <code>build.build-dir</code> key in
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<code>book.toml</code>, or to <code>./book</code>.</p>
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<h4 id="--chapter"><a class="header" href="#--chapter">--chapter</a></h4>
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<p>The <code>--chapter</code> (<code>-c</code>) option allows you to test a specific chapter of the
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book using the chapter name or the relative path to the chapter.</p>
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</main>
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