feat(transport): Start async implementation (sendmail, file and stub transports)

tests/transport_file.rs

@@ -1,7 +1,7 @@
 #[cfg(test)]
 #[cfg(feature = "file-transport")]
 mod test {
-    use lettre::{transport::file::FileTransport, Message, Transport};
+    use lettre::{transport::file::FileTransport, Message};
     use std::{
         env::temp_dir,
         fs::{remove_file, File},
@@ -10,6 +10,7 @@ mod test {
 
     #[test]
     fn file_transport() {
+        use lettre::Transport;
         let sender = FileTransport::new(temp_dir());
         let email = Message::builder()
             .from("NoBody <nobody@domain.tld>".parse().unwrap())
@@ -33,4 +34,32 @@ mod test {
             "{\"envelope\":{\"forward_path\":[\"hei@domain.tld\"],\"reverse_path\":\"nobody@domain.tld\"},\"raw_message\":null,\"message\":\"From: NoBody <nobody@domain.tld>\\r\\nReply-To: Yuin <yuin@domain.tld>\\r\\nTo: Hei <hei@domain.tld>\\r\\nSubject: Happy new year\\r\\nDate: Tue, 15 Nov 1994 08:12:31 GMT\\r\\n\\r\\nBe happy!\"}");
         remove_file(file).unwrap();
     }
+
+    #[cfg(feature = "async")]
+    #[async_attributes::test]
+    async fn file_transport_async() {
+        use lettre::r#async::Transport;
+        let sender = FileTransport::new(temp_dir());
+        let email = Message::builder()
+            .from("NoBody <nobody@domain.tld>".parse().unwrap())
+            .reply_to("Yuin <yuin@domain.tld>".parse().unwrap())
+            .to("Hei <hei@domain.tld>".parse().unwrap())
+            .subject("Happy new year")
+            .date("Tue, 15 Nov 1994 08:12:31 GMT".parse().unwrap())
+            .body("Be happy!")
+            .unwrap();
+
+        let result = sender.send(email).await;
+        let id = result.unwrap();
+
+        let file = temp_dir().join(format!("{}.json", id));
+        let mut f = File::open(file.clone()).unwrap();
+        let mut buffer = String::new();
+        let _ = f.read_to_string(&mut buffer);
+
+        assert_eq!(
+            buffer,
+            "{\"envelope\":{\"forward_path\":[\"hei@domain.tld\"],\"reverse_path\":\"nobody@domain.tld\"},\"raw_message\":null,\"message\":\"From: NoBody <nobody@domain.tld>\\r\\nReply-To: Yuin <yuin@domain.tld>\\r\\nTo: Hei <hei@domain.tld>\\r\\nSubject: Happy new year\\r\\nDate: Tue, 15 Nov 1994 08:12:31 GMT\\r\\n\\r\\nBe happy!\"}");
+        remove_file(file).unwrap();
+    }
 }

tests/transport_sendmail.rs

@@ -1,10 +1,11 @@
 #[cfg(test)]
 #[cfg(feature = "sendmail-transport")]
 mod test {
-    use lettre::{transport::sendmail::SendmailTransport, Message, Transport};
+    use lettre::{transport::sendmail::SendmailTransport, Message};
 
     #[test]
-    fn sendmail_transport_simple() {
+    fn sendmail_transport() {
+        use lettre::Transport;
         let sender = SendmailTransport::new();
         let email = Message::builder()
             .from("NoBody <nobody@domain.tld>".parse().unwrap())
@@ -18,4 +19,22 @@ mod test {
         println!("{:?}", result);
         assert!(result.is_ok());
     }
+
+    #[cfg(feature = "async")]
+    #[async_attributes::test]
+    async fn sendmail_transport_async() {
+        use lettre::r#async::Transport;
+        let sender = SendmailTransport::new();
+        let email = Message::builder()
+            .from("NoBody <nobody@domain.tld>".parse().unwrap())
+            .reply_to("Yuin <yuin@domain.tld>".parse().unwrap())
+            .to("Hei <hei@domain.tld>".parse().unwrap())
+            .subject("Happy new year")
+            .date("Tue, 15 Nov 1994 08:12:31 GMT".parse().unwrap())
+            .body("Be happy!")
+            .unwrap();
+
+        let result = sender.send(email).await;
+        assert!(result.is_ok());
+    }
 }

tests/transport_stub.rs

@@ -1,7 +1,8 @@
-use lettre::{transport::stub::StubTransport, Message, Transport};
+use lettre::{transport::stub::StubTransport, Message};
 
 #[test]
 fn stub_transport() {
+    use lettre::Transport;
     let sender_ok = StubTransport::new_ok();
     let sender_ko = StubTransport::new_error();
     let email = Message::builder()
@@ -12,6 +13,25 @@ fn stub_transport() {
         .body("Be happy!")
         .unwrap();
 
-    sender_ok.send(&email.clone()).unwrap();
+    sender_ok.send(&email).unwrap();
     sender_ko.send(&email).unwrap_err();
 }
+
+#[cfg(feature = "async")]
+#[async_attributes::test]
+async fn stub_transport_async() {
+    use lettre::r#async::Transport;
+    let sender_ok = StubTransport::new_ok();
+    let sender_ko = StubTransport::new_error();
+    let email = Message::builder()
+        .from("NoBody <nobody@domain.tld>".parse().unwrap())
+        .reply_to("Yuin <yuin@domain.tld>".parse().unwrap())
+        .to("Hei <hei@domain.tld>".parse().unwrap())
+        .subject("Happy new year")
+        .date("Tue, 15 Nov 1994 08:12:31 GMT".parse().unwrap())
+        .body("Be happy!")
+        .unwrap();
+
+    sender_ok.send(email.clone()).await.unwrap();
+    sender_ko.send(email).await.unwrap_err();
+}