Set up clippy for serde_test

serde_test/Cargo.toml

@@ -11,7 +11,11 @@ readme = "../README.md"
 keywords = ["serde", "serialization"]
 include = ["Cargo.toml", "src/**/*.rs"]
 
+[features]
+unstable-testing = ["clippy"]
+
 [dependencies]
+clippy = { version = "0.*", optional = true }
 serde = { version = "0.9", path = "../serde" }
 
 [badges]

serde_test/src/lib.rs

@@ -1,3 +1,6 @@
+#![cfg_attr(feature = "clippy", feature(plugin))]
+#![cfg_attr(feature = "clippy", plugin(clippy))]
+
 extern crate serde;
 
 mod assert;