Keep test suite fast by tuning timeout for tests.

configuration/base.yaml

@@ -12,3 +12,4 @@ email_client:
   base_url: "localhost"
   sender_email: "test@gmail.com"
   authorization_token: "my-secret-token"
+  timeout_milliseconds: 10000

src/configuration.rs

@@ -54,12 +54,17 @@ pub struct EmailClientSettings {
     pub base_url: String,
     pub sender_email: String,
     pub authorization_token: String,
+    pub timeout_milliseconds: u64,
 }
 
 impl EmailClientSettings {
     pub fn sender(&self) -> Result<SubscriberEmail, String> {
         SubscriberEmail::parse(self.sender_email.clone())
     }
+
+    pub fn timeout(&self) -> std::time::Duration {
+        std::time::Duration::from_millis(self.timeout_milliseconds)
+    }
 }
 
 pub fn get_configuration() -> Result<Settings, config::ConfigError> {

src/email_client.rs

@@ -9,11 +9,13 @@ pub struct EmailClient {
 }
 
 impl EmailClient {
-    pub fn new(base_url: String, sender: SubscriberEmail, authorization_token: String) -> Self {
+    pub fn new(
-        let http_client = Client::builder()
+        base_url: String,
-            .timeout(std::time::Duration::from_secs(10))
+        sender: SubscriberEmail,
-            .build()
+        authorization_token: String,
-            .unwrap();
+        timeout: std::time::Duration,
+    ) -> Self {
+        let http_client = Client::builder().timeout(timeout).build().unwrap();
         Self {
             http_client,
             base_url,
@@ -103,7 +105,12 @@ mod tests {
 
     /// Get a test instance of `EmailClient`.
     fn email_client(base_url: String) -> EmailClient {
-        EmailClient::new(base_url, email(), Faker.fake())
+        EmailClient::new(
+            base_url,
+            email(),
+            Faker.fake(),
+            std::time::Duration::from_millis(200),
+        )
     }
 
     #[tokio::test]

src/startup.rs

@@ -24,10 +24,12 @@ impl Application {
             .email_client
             .sender()
             .expect("Invalid sender email address.");
+        let timeout = configuration.email_client.timeout();
         let email_client = EmailClient::new(
             configuration.email_client.base_url,
             sender_email,
             configuration.email_client.authorization_token,
+            timeout,
         );
 
         let address = format!(