Add tests for optional_result example.

examples/optional_result/Cargo.toml

@@ -7,3 +7,6 @@ workspace = "../../"
 [dependencies]
 rocket = { path = "../../lib" }
 rocket_codegen = { path = "../../codegen" }
+
+[dev-dependencies]
+rocket = { path = "../../lib", features = ["testing"] }

examples/optional_result/src/main.rs

@@ -3,6 +3,9 @@
 
 extern crate rocket;
 
+#[cfg(test)]
+mod tests;
+
 #[get("/users/<name>")]
 fn user(name: &str) -> Option<&'static str> {
     if name == "Sergio" {

examples/optional_result/src/tests.rs

@@ -0,0 +1,24 @@
+use super::rocket;
+use rocket::testing::MockRequest;
+use rocket::http::{Method, Status};
+
+#[test]
+fn test_200() {
+    let rocket = rocket::ignite().mount("/", routes![super::user]);
+    let mut request = MockRequest::new(Method::Get, "/users/Sergio");
+    let mut response = request.dispatch_with(&rocket);
+
+    assert_eq!(response.status(), Status::Ok);
+    assert_eq!(response.body().and_then(|b| b.into_string()),
+               Some("Hello, Sergio!".to_string()));
+}
+
+#[test]
+fn test_404() {
+    let rocket = rocket::ignite().mount("/", routes![super::user]);
+    let mut request = MockRequest::new(Method::Get, "/users/unknown");
+    let response = request.dispatch_with(&rocket);
+
+    // Only test the status because the body is the default 404.
+    assert_eq!(response.status(), Status::NotFound);
+}