feat(test): spin up new logical database tests

- Tests will use new database every run
- Added chrono and uuid dependencies.
- Updated documentation

tests/health_check.rs

@@ -4,12 +4,12 @@ use test_utils::spawn_app;
 
 #[tokio::test]
 async fn health_check_works() {
-    let server_address = spawn_app();
+    let test_app = spawn_app().await;
 
     let client = reqwest::Client::new();
 
     let response = client
-        .get(&format!("{}/health_check", &server_address))
+        .get(&format!("{}/health_check", &test_app.address))
         .send()
         .await
         .expect("Failed to execute health_check request.");

tests/subscribe.rs

@@ -1,27 +1,17 @@
 mod test_utils;
 
-use email_newsletter_api::configuration::{self, get_configuration};
-use sqlx::{Connection, PgConnection};
 use test_utils::spawn_app;
 
 #[tokio::test]
 async fn subscribe_returns_a_200_for_valid_form_data() {
-    let server_address = spawn_app();
-
-    let configuration = get_configuration().expect("Failed to read configuration");
-
-    let postgres_connection_string = configuration.database.connection_string();
-
-    let mut connection = PgConnection::connect(&postgres_connection_string)
-        .await
-        .expect("Failed to connect to Postgres");
+    let test_app = spawn_app().await;
 
     let client = reqwest::Client::new();
 
     let body = "name=le%20test&email=le_test%40gmail.com";
 
     let response = client
-        .post(&format!("{}/subscribe", &server_address))
+        .post(&format!("{}/subscribe", &test_app.address))
         .header("Content-Type", "application/x-www-form-urlencoded")
         .body(body)
         .send()
@@ -32,7 +22,7 @@ async fn subscribe_returns_a_200_for_valid_form_data() {
     assert_eq!(Some(0), response.content_length());
 
     let saved = sqlx::query!("SELECT email, name FROM subscriptions")
-        .fetch_one(&mut connection)
+        .fetch_one(&test_app.db_pool)
         .await
         .expect("Failed to fetch saved subscribtions");
 
@@ -42,7 +32,7 @@ async fn subscribe_returns_a_200_for_valid_form_data() {
 
 #[tokio::test]
 async fn subscribe_returns_a_400_when_data_is_missing() {
-    let server_address = spawn_app();
+    let test_app = spawn_app().await;
 
     let client = reqwest::Client::new();
 
@@ -54,7 +44,7 @@ async fn subscribe_returns_a_400_when_data_is_missing() {
 
     for (invalid_body, error_message) in test_cases {
         let response = client
-            .post(&format!("{}/subscribe", &server_address))
+            .post(&format!("{}/subscribe", &test_app.address))
             .header("Content-Type", "application/x-www-form-urlencoded")
             .body(invalid_body)
             .send()

tests/test_utils.rs

@@ -1,17 +1,31 @@
+use email_newsletter_api::configuration::{get_configuration, DatabaseSettings};
+use sqlx::{Connection, Executor, PgConnection, PgPool};
 use std::net::TcpListener;
+use uuid::Uuid;
+
+pub struct TestApp {
+    pub address: String,
+    pub db_pool: PgPool,
+}
 
-#[allow(dead_code)]
 #[allow(clippy::let_underscore_future)]
-pub fn spawn_app() -> String {
+pub async fn spawn_app() -> TestApp {
     /* Spawn a app server with a TcpListener bound to localhost:<random port>
      *
      *  Returns a valid IPv4 string (i.e localhost:8080)
      */
     let listener = TcpListener::bind("127.0.0.1:0").expect("Failed to bind to a random port");
 
+    let mut configuration = get_configuration().expect("Failed to read configuration");
+
+    configuration.database.database_name = Uuid::new_v4().to_string();
+
+    let db_conn_pool = configure_test_database(&configuration.database).await;
+
     let port = listener.local_addr().unwrap().port();
 
-    let server = email_newsletter_api::startup::run(listener).expect("Failed to bind address");
+    let server = email_newsletter_api::startup::run(listener, db_conn_pool.clone())
+        .expect("Failed to bind address");
 
     /* `tokio::spawn(/*async task*/)` will spawn an async task to be run.
     We can continue executing other code concurrently while `task` runs in the background.
@@ -20,5 +34,30 @@ pub fn spawn_app() -> String {
     (which `#[tokio::test]` will take care for us in the mean time).*/
     let _ = tokio::spawn(server);
 
-    format!("http://127.0.0.1:{}", port)
+    TestApp {
+        address: format!("http://127.0.0.1:{}", port),
+        db_pool: db_conn_pool,
+    }
+}
+
+pub async fn configure_test_database(db_config: &DatabaseSettings) -> PgPool {
+    let mut connection = PgConnection::connect(&db_config.connection_string_without_db())
+        .await
+        .expect("Failed to connect to Postgres");
+
+    connection
+        .execute(format!(r#"CREATE DATABASE "{}";"#, db_config.database_name).as_str())
+        .await
+        .expect("Failed to create database");
+
+    let conn_pool = PgPool::connect(&db_config.connection_string())
+        .await
+        .expect("Failed to connect to PostgreSQL pool");
+
+    sqlx::migrate!("./migrations")
+        .run(&conn_pool)
+        .await
+        .expect("Failed to migrate the database");
+
+    conn_pool
 }