[test] the form example (#3267)

Cargo.lock

@@ -1463,8 +1463,11 @@ name = "example-form"
 version = "0.1.0"
 dependencies = [
  "axum",
+ "http-body-util",
+ "mime",
  "serde",
  "tokio",
+ "tower 0.5.2",
  "tracing",
  "tracing-subscriber",
 ]
@@ -2479,12 +2482,12 @@ dependencies = [
 
 [[package]]
 name = "http-body-util"
-version = "0.1.2"
+version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "793429d76616a256bcb62c2a2ec2bed781c8307e797e2598c50010f2bee2544f"
+checksum = "b021d93e26becf5dc7e1b75b1bed1fd93124b374ceb73f43d4d4eafec896a64a"
 dependencies = [
  "bytes",
- "futures-util",
+ "futures-core",
  "http 1.2.0",
  "http-body 1.0.1",
  "pin-project-lite",

examples/form/Cargo.toml

@@ -10,3 +10,8 @@ serde = { version = "1.0", features = ["derive"] }
 tokio = { version = "1.0", features = ["full"] }
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+[dev-dependencies]
+http-body-util = "0.1.3"
+mime = "0.3.17"
+tower = "0.5.2"

examples/form/src/main.rs

@@ -19,7 +19,7 @@ async fn main() {
         .init();
 
     // build our application with some routes
-    let app = Router::new().route("/", get(show_form).post(accept_form));
+    let app = app();
 
     // run it
     let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
@@ -29,6 +29,10 @@ async fn main() {
     axum::serve(listener, app).await.unwrap();
 }
 
+fn app() -> Router {
+    Router::new().route("/", get(show_form).post(accept_form))
+}
+
 async fn show_form() -> Html<&'static str> {
     Html(
         r#"
@@ -62,6 +66,65 @@ struct Input {
     email: String,
 }
 
-async fn accept_form(Form(input): Form<Input>) {
+async fn accept_form(Form(input): Form<Input>) -> Html<String> {
     dbg!(&input);
+    Html(format!(
+        "email='{}'\nname='{}'\n",
+        &input.email, &input.name
+    ))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use axum::{
+        body::Body,
+        http::{self, Request, StatusCode},
+    };
+    use http_body_util::BodyExt;
+    use tower::ServiceExt; // for `call`, `oneshot`, and `ready` // for `collect`
+
+    #[tokio::test]
+    async fn test_get() {
+        let app = app();
+
+        let response = app
+            .oneshot(Request::builder().uri("/").body(Body::empty()).unwrap())
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body = response.into_body().collect().await.unwrap().to_bytes();
+        let body = std::str::from_utf8(&body).unwrap();
+
+        assert!(body.contains(r#"<input type="submit" value="Subscribe!">"#));
+    }
+
+    #[tokio::test]
+    async fn test_post() {
+        let app = app();
+
+        let response = app
+            .oneshot(
+                Request::builder()
+                    .method(http::Method::POST)
+                    .uri("/")
+                    .header(
+                        http::header::CONTENT_TYPE,
+                        mime::APPLICATION_WWW_FORM_URLENCODED.as_ref(),
+                    )
+                    .body(Body::from("name=foo&email=bar@axum"))
+                    .unwrap(),
+            )
+            .await
+            .unwrap();
+
+        assert_eq!(response.status(), StatusCode::OK);
+
+        let body = response.into_body().collect().await.unwrap().to_bytes();
+        let body = std::str::from_utf8(&body).unwrap();
+
+        assert_eq!(body, "email='bar@axum'\nname='foo'\n");
+    }
 }