diff --git a/examples/content_types/Cargo.toml b/examples/content_types/Cargo.toml
index 973be5bd..cd4388f1 100644
--- a/examples/content_types/Cargo.toml
+++ b/examples/content_types/Cargo.toml
@@ -10,3 +10,6 @@ rocket_codegen = { path = "../../codegen" }
 serde = "0.8"
 serde_json = "0.8"
 serde_derive = "0.8"
+
+[dev-dependencies]
+rocket = { path = "../../lib", features = ["testing"] }
diff --git a/examples/content_types/src/main.rs b/examples/content_types/src/main.rs
index d33f789b..84b2b0ca 100644
--- a/examples/content_types/src/main.rs
+++ b/examples/content_types/src/main.rs
@@ -3,7 +3,11 @@
 
 extern crate rocket;
 extern crate serde_json;
-#[macro_use] extern crate serde_derive;
+#[macro_use]
+extern crate serde_derive;
+
+#[cfg(test)]
+mod tests;
 
 use rocket::{Request, Error};
 use rocket::http::ContentType;
@@ -34,14 +38,15 @@ fn not_found(_: Error, request: &Request) -> String {
         format!("<p>This server only supports JSON requests, not '{}'.</p>",
                 request.content_type())
     } else {
-        format!("<p>Sorry, '{}' is not a valid path!</p>
-                    <p>Try visiting /hello/&lt;name&gt;/&lt;age&gt; instead.</p>",
-                    request.uri())
+        format!("<p>Sorry, '{}' is an invalid path! Try \
+                 /hello/&lt;name&gt;/&lt;age&gt; instead.</p>",
+                request.uri())
     }
 }
 
 fn main() {
     rocket::ignite()
-        .mount("/hello", routes![hello]).catch(errors![not_found])
+        .mount("/hello", routes![hello])
+        .catch(errors![not_found])
         .launch();
 }
diff --git a/examples/content_types/src/tests.rs b/examples/content_types/src/tests.rs
new file mode 100644
index 00000000..b7b0f254
--- /dev/null
+++ b/examples/content_types/src/tests.rs
@@ -0,0 +1,40 @@
+use super::rocket;
+use super::serde_json;
+use super::Person;
+use rocket::http::{ContentType, Method, Status};
+use rocket::testing::MockRequest;
+
+fn test(uri: &str, content_type: ContentType, status: Status, body: String) {
+    let rocket = rocket::ignite()
+        .mount("/hello", routes![super::hello])
+        .catch(errors![super::not_found]);
+    let mut request = MockRequest::new(Method::Get, uri).header(content_type);
+    let mut response = request.dispatch_with(&rocket);
+
+    assert_eq!(response.status(), status);
+    assert_eq!(response.body().and_then(|b| b.into_string()), Some(body));
+}
+
+#[test]
+fn test_hello() {
+    let person = Person {
+        name: "Michael".to_string(),
+        age: 80,
+    };
+    let body = serde_json::to_string(&person).unwrap();
+    test("/hello/Michael/80", ContentType::JSON, Status::Ok, body);
+}
+
+#[test]
+fn test_hello_invalid_content_type() {
+    let body = format!("<p>This server only supports JSON requests, not '{}'.</p>",
+                       ContentType::HTML);
+    test("/hello/Michael/80", ContentType::HTML, Status::NotFound, body);
+}
+
+#[test]
+fn test_404() {
+    let body = "<p>Sorry, '/unknown' is an invalid path! Try \
+                /hello/&lt;name&gt;/&lt;age&gt; instead.</p>";
+    test("/unknown", ContentType::JSON, Status::NotFound, body.to_string());
+}