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doc_testing.md: clarify tests vs doc-tests #1547

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Jun 2, 2022
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doc_testing.md: clarify tests vs doc-tests #1547

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9 changes: 5 additions & 4 deletions src/testing/doc_testing.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
The primary way of documenting a Rust project is through annotating the source
code. Documentation comments are written in [markdown] and support code
blocks in them. Rust takes care about correctness, so these code blocks are
compiled and used as tests.
compiled and used as documentation tests.

```rust,ignore
/// First line is a short summary describing function.
Expand Down Expand Up @@ -48,7 +48,8 @@ pub fn div(a: i32, b: i32) -> i32 {
}
```

Tests can be run with `cargo test`:
Code blocks in documentation are automatically tested
when running the regular `cargo test` command:

```shell
$ cargo test
Expand All @@ -73,8 +74,8 @@ the functionality, which is one of the most important
[guidelines][question-instead-of-unwrap]. It allows using examples from docs as
complete code snippets. But using `?` makes compilation fail since `main`
returns `unit`. The ability to hide some source lines from documentation comes
to the rescue: one may write `fn try_main() -> Result<(), ErrorType>`, hide it and
`unwrap` it in hidden `main`. Sounds complicated? Here's an example:
to the rescue: one may write `fn try_main() -> Result<(), ErrorType>`, hide it
and `unwrap` it in hidden `main`. Sounds complicated? Here's an example:

```rust,ignore
/// Using hidden `try_main` in doc tests.
Expand Down