Added benchmarks for parsing Method (#464)

Cargo.toml

@@ -47,6 +47,10 @@ path = "benches/header_name.rs"
 name = "header_value"
 path = "benches/header_value.rs"
 
+[[bench]]
+name = "method"
+path = "benches/method.rs"
+
 [[bench]]
 name = "uri"
 path = "benches/uri.rs"

benches/method.rs

@@ -0,0 +1,40 @@
+#![feature(test)]
+
+extern crate test;
+
+use http::method::Method;
+use test::Bencher;
+
+fn make_all_methods() -> Vec<Vec<u8>> {
+    vec![
+        b"OPTIONS".to_vec(),
+        b"GET".to_vec(),
+        b"POST".to_vec(),
+        b"PUT".to_vec(),
+        b"DELETE".to_vec(),
+        b"HEAD".to_vec(),
+        b"TRACE".to_vec(),
+        b"CONNECT".to_vec(),
+        b"PATCH".to_vec(),
+        b"CUSTOM_SHORT".to_vec(),
+        b"CUSTOM_LONG_METHOD".to_vec(),
+    ]
+}
+
+#[bench]
+fn method_easy(b: &mut Bencher) {
+    let name = b"GET";
+    b.iter(|| {
+        Method::from_bytes(&name[..]).unwrap();
+    });
+}
+
+#[bench]
+fn method_various(b: &mut Bencher) {
+    let all_methods = make_all_methods();
+    b.iter(|| {
+        for name in &all_methods {
+            Method::from_bytes(name.as_slice()).unwrap();
+        }
+    });
+}