Automatically check if README.md examples are working when running "cargo test"

Author: GuillaumeGomez

Cargo.toml

@@ -34,3 +34,4 @@ rand = "0.6"
 rand_xorshift = "0.1"
 serde = "1"
 serde_derive = "1"
+doc-comment = "0.3"

README.md

@@ -104,14 +104,14 @@ command to get a visualization of an nbody simulation. To see the
 effect of using Rayon, press `s` to run sequentially and `p` to run in
 parallel.
 
-```
+```text
 > cd rayon-demo
 > cargo run --release -- nbody visualize
 ```
 
 For more information on demos, try:
 
-```
+```text
 > cd rayon-demo
 > cargo run --release -- --help
 ```

src/lib.rs

@@ -85,6 +85,12 @@ extern crate rayon_core;
 extern crate rand;
 #[cfg(test)]
 extern crate rand_xorshift;
+#[cfg(test)]
+#[macro_use]
+extern crate doc_comment;
+
+#[cfg(test)]
+doctest!("../README.md");
 
 #[macro_use]
 mod delegate;