diff --git a/examples/config/Cargo.toml b/examples/config/Cargo.toml
index 413d7cdc..2a83e1c5 100644
--- a/examples/config/Cargo.toml
+++ b/examples/config/Cargo.toml
@@ -7,3 +7,6 @@ workspace = "../../"
 [dependencies]
 rocket = { path = "../../lib" }
 rocket_codegen = { path = "../../codegen" }
+
+[dev-dependencies]
+rocket = { path = "../../lib", features = ["testing"] }
diff --git a/examples/config/src/lib.rs b/examples/config/src/lib.rs
new file mode 100644
index 00000000..c61740e3
--- /dev/null
+++ b/examples/config/src/lib.rs
@@ -0,0 +1,9 @@
+#![feature(plugin)]
+#![plugin(rocket_codegen)]
+
+extern crate rocket;
+
+#[get("/")]
+pub fn hello() -> &'static str {
+    "Hello, world!"
+}
diff --git a/examples/config/src/main.rs b/examples/config/src/main.rs
index 1198442d..30fb2b83 100644
--- a/examples/config/src/main.rs
+++ b/examples/config/src/main.rs
@@ -2,14 +2,12 @@
 #![plugin(rocket_codegen)]
 
 extern crate rocket;
+extern crate config;
+
+#[cfg(test)]
+mod tests;
 
 // This example's illustration is the Rocket.toml file.
-
-#[get("/")]
-fn hello() -> &'static str {
-    "Hello, world!"
-}
-
 fn main() {
-    rocket::ignite().mount("/hello", routes![hello]).launch()
+    rocket::ignite().mount("/hello", routes![config::hello]).launch()
 }
diff --git a/examples/config/src/tests.rs b/examples/config/src/tests.rs
new file mode 100644
index 00000000..7f8bc55a
--- /dev/null
+++ b/examples/config/src/tests.rs
@@ -0,0 +1,13 @@
+use super::rocket;
+use rocket::testing::MockRequest;
+use rocket::http::Method;
+
+#[test]
+fn test_hello_world() {
+    let rocket = rocket::ignite().mount("/hello", routes![super::hello]);
+    let mut request = MockRequest::new(Method::Get, "/hello");
+    let mut response = request.dispatch_with(&rocket);
+
+    assert_eq!(response.body().and_then(|b| b.into_string()),
+               Some("Hello, world!".to_string()));
+}
diff --git a/examples/config/tests/common/mod.rs b/examples/config/tests/common/mod.rs
new file mode 100644
index 00000000..375b22a1
--- /dev/null
+++ b/examples/config/tests/common/mod.rs
@@ -0,0 +1,53 @@
+extern crate rocket;
+extern crate config as lib;
+use std;
+use rocket::config::{self, Environment};
+use rocket::http::Method;
+use rocket::LoggingLevel;
+use rocket::testing::MockRequest;
+
+
+pub fn test_config(environment: Environment) {
+    // Manually set the config environment variable so that Rocket initializes it in `init()`.
+    std::env::set_var("ROCKET_ENV", environment.to_string());
+    rocket::ignite().mount("/hello", routes![lib::hello]);
+
+    let config = config::active().unwrap();
+    match environment {
+        Environment::Development => {
+            assert_eq!(config.address, "localhost".to_string());
+            assert_eq!(config.port, 8000);
+            assert_eq!(config.log_level, LoggingLevel::Normal);
+            assert_eq!(config.env, config::Environment::Development);
+            assert_eq!(config.extras().count(), 2);
+            assert_eq!(config.get_str("hi"), Ok("Hello!"));
+            assert_eq!(config.get_bool("is_extra"), Ok(true));
+        }
+        Environment::Staging => {
+            assert_eq!(config.address, "0.0.0.0".to_string());
+            assert_eq!(config.port, 80);
+            assert_eq!(config.log_level, LoggingLevel::Normal);
+            assert_eq!(config.env, config::Environment::Staging);
+            assert_eq!(config.extras().count(), 0);
+        }
+        Environment::Production => {
+            assert_eq!(config.address, "0.0.0.0".to_string());
+            assert_eq!(config.port, 80);
+            assert_eq!(config.log_level, LoggingLevel::Critical);
+            assert_eq!(config.env, config::Environment::Production);
+            assert_eq!(config.extras().count(), 0);
+        }
+    }
+
+    // Rocket `take`s the key, so this should always be `None`
+    assert_eq!(config.take_session_key(), None);
+}
+
+pub fn test_hello() {
+    let rocket = rocket::ignite().mount("/hello", routes![lib::hello]);
+    let mut request = MockRequest::new(Method::Get, "/hello");
+    let mut response = request.dispatch_with(&rocket);
+
+    assert_eq!(response.body().and_then(|b| b.into_string()),
+               Some("Hello, world!".to_string()));
+}
diff --git a/examples/config/tests/development.rs b/examples/config/tests/development.rs
new file mode 100644
index 00000000..df35d228
--- /dev/null
+++ b/examples/config/tests/development.rs
@@ -0,0 +1,13 @@
+#![feature(plugin)]
+#![plugin(rocket_codegen)]
+
+extern crate rocket;
+use rocket::config::Environment;
+
+mod common;
+
+#[test]
+fn test() {
+    common::test_config(Environment::Development);
+    common::test_hello();
+}
diff --git a/examples/config/tests/production.rs b/examples/config/tests/production.rs
new file mode 100644
index 00000000..08397303
--- /dev/null
+++ b/examples/config/tests/production.rs
@@ -0,0 +1,13 @@
+#![feature(plugin)]
+#![plugin(rocket_codegen)]
+
+extern crate rocket;
+use rocket::config::Environment;
+
+mod common;
+
+#[test]
+fn test() {
+    common::test_config(Environment::Production);
+    common::test_hello();
+}
diff --git a/examples/config/tests/staging.rs b/examples/config/tests/staging.rs
new file mode 100644
index 00000000..fcb1c519
--- /dev/null
+++ b/examples/config/tests/staging.rs
@@ -0,0 +1,13 @@
+#![feature(plugin)]
+#![plugin(rocket_codegen)]
+
+extern crate rocket;
+use rocket::config::Environment;
+
+mod common;
+
+#[test]
+fn test() {
+    common::test_config(Environment::Staging);
+    common::test_hello();
+}