test: convert single test file to test suite

tests/api/subscriptions.rs

@@ -0,0 +1,91 @@
+use crate::helpers::{spawn_app, TestApp};
+
+#[tokio::test]
+async fn subscribe_returns_a_422_when_data_is_missing() {
+    // Arrange
+    let TestApp { address, .. } = spawn_app().await;
+    let client = reqwest::Client::new();
+    let test_cases = vec![
+        ("name=le%20guin", "missing the email"),
+        ("email=ursula_le_guin%40gmail.com", "missing the name"),
+        ("", "missing both name and email"),
+    ];
+
+    for (invalid_body, error_message) in test_cases {
+        // Act
+        let response = client
+            .post(&format!("{address}/subscriptions"))
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body(invalid_body)
+            .send()
+            .await
+            .expect("Failed to execute request.");
+
+        // Assert
+        assert_eq!(
+            422,
+            response.status().as_u16(),
+            "The API did not fail with 422 when the payload was {}.",
+            error_message
+        );
+    }
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_200_for_valid_form_data() {
+    // Arrange
+    let app = spawn_app().await;
+    let client = reqwest::Client::new();
+
+    // Act
+    let body = "name=le%20guin&email=ursula_le_guin%40gmail.com";
+    let response = client
+        .post(&format!("{}/subscriptions", &app.address))
+        .header("Content-Type", "application/x-www-form-urlencoded")
+        .body(body)
+        .send()
+        .await
+        .expect("Failed to execute request.");
+
+    // Assert
+    assert_eq!(200, response.status().as_u16());
+
+    let saved = sqlx::query!("SELECT email, name FROM subscriptions",)
+        .fetch_one(&app.db_pool)
+        .await
+        .expect("Failed to fetch saved subscription.");
+
+    assert_eq!(saved.email, "ursula_le_guin@gmail.com");
+    assert_eq!(saved.name, "le guin");
+}
+
+#[tokio::test]
+async fn subscribe_returns_a_400_when_fields_are_present_but_invalid() {
+    // Arrange
+    let app = spawn_app().await;
+    let client = reqwest::Client::new();
+    let test_cases = vec![
+        ("name=&email=ursula_le_guin%40gmail.com", "empty name"),
+        ("name=Ursula&email=", "empty email"),
+        ("name=Ursula&email=definitely-not-an-email", "invalid email"),
+    ];
+
+    for (body, description) in test_cases {
+        // Act
+        let response = client
+            .post(&format!("{}/subscriptions", &app.address))
+            .header("Content-Type", "application/x-www-form-urlencoded")
+            .body(body)
+            .send()
+            .await
+            .expect("Failed to execute request.");
+
+        // Assert
+        assert_eq!(
+            400,
+            response.status().as_u16(),
+            "The API did not return a 200 OK when the payload was {}.",
+            description
+        );
+    }
+}