add test that checks for empty body on HEAD req (#179)

* add test that checks for empty body on HEAD req

* update test
currently not working since http-service-mock doesn't exhibit correct behavior yet

Author: fairingrey

tests/head_response_empty_body.rs

@@ -0,0 +1,23 @@
+#![feature(async_await)]
+
+use futures::executor::block_on;
+use http_service::Body;
+use http_service_mock::make_server;
+use tide::Context;
+
+async fn ok(_cx: Context<()>) -> String {
+    String::from("this shouldn't exist in the body of a HEAD response")
+}
+
+#[test]
+fn head_response_empty() {
+    let mut app = tide::App::new();
+    app.at("/").get(ok);
+    let mut server = make_server(app.into_http_service()).unwrap();
+
+    let req = http::Request::head("/").body(Body::empty()).unwrap();
+    let res = server.simulate(req).unwrap();
+    let body = block_on(res.into_body().into_vec()).unwrap();
+    dbg!(&String::from_utf8(body));
+    //assert!(body.is_empty());
+}