finished chapter 3.7

tests/health_check.rs

@@ -1,10 +1,11 @@
+use reqwest::Client;
 use tokio::net::TcpListener;
 
 #[tokio::test]
 async fn health_check() {
     let address = spawn_app().await;
     let url = format!("{}/health_check", &address);
-    let client = reqwest::Client::new();
+    let client = Client::new();
     let response = client
         .get(&url)
         .send()
@@ -15,6 +16,52 @@ async fn health_check() {
     assert_eq!(Some(0), response.content_length());
 }
 
+#[tokio::test]
+async fn subscribe_returns_200_for_valid_form_data() {
+    let address = spawn_app().await;
+    let client = Client::new();
+
+    let body = "name=kristofers%20solo&email=dev%40kristofers.solo";
+    let response = client
+        .post(&format!("{}/subscribtions", &address))
+        .header("Content-Type", "application/x-www-form-urlencoded")
+        .body(body)
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    assert_eq!(200, response.status().as_u16());
+}
+
+#[tokio::test]
+async fn subscribe_returns_400_when_data_is_missing() {
+    let address = spawn_app().await;
+    let client = Client::new();
+
+    let test_cases = vec![
+        ("name=krisotfers%20solo", "missing the email"),
+        ("email=dev%40kristofers.solo", "missing the name"),
+        ("", "missing both name and email"),
+    ];
+
+    for (invalid_body, error_message) in test_cases {
+        let response = client
+            .post(&format!("{}/subscribtions", &address))
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body(invalid_body)
+            .send()
+            .await
+            .expect("Failed to execute request.");
+
+        assert_eq!(
+            422,
+            response.status().as_u16(),
+            "The API did not call with 400 Bad Request when the payload was {}.",
+            error_message
+        );
+    }
+}
+
 async fn spawn_app() -> String {
     let listener = TcpListener::bind("127.0.0.1:0")
         .await