added test for LoginAck (#1890)

sqlx-core/src/mssql/protocol/login_ack.rs

@@ -4,6 +4,7 @@ use crate::error::Error;
 use crate::mssql::io::MssqlBufExt;
 use crate::mssql::protocol::pre_login::Version;
 
+#[allow(dead_code)]
 #[derive(Debug)]
 pub(crate) struct LoginAck {
     pub(crate) interface: u8,
@@ -37,3 +38,23 @@ impl LoginAck {
         })
     }
 }
+
+#[test]
+fn test_get() {
+    #[rustfmt::skip]
+    let mut buf = Bytes::from_static(&[
+        0x36, 0, 1, 0x74, 0, 0, 4, 0x16, 0x4d, 0, 0x69, 0, 0x63, 0, 0x72, 0, 0x6f, 0, 0x73, 0, 0x6f, 0, 0x66, 0, 0x74, 0, 0x20, 0, 0x53, 0, 51, 0, 0x4c, 0, 0x20, 0, 0x53, 0, 0x65, 0, 0x72, 0, 0x76, 0, 0x65, 0, 0x72, 0, 0, 0, 0, 0, 0xf, 0, 0x10, 0x7f, 0xe3, 0x13, 0, 4, 4, 0x34, 0, 0x30, 0, 0x39, 0, 0x36, 0, 4, 0x34, 0, 0x30, 0, 0x39, 0, 0x36, 0, 0xfd, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
+    ]);
+
+    let login_ack = LoginAck::get(&mut buf).unwrap();
+
+    assert_eq!(login_ack.interface, 1);
+    assert_eq!(login_ack.tds_version, 67108980);
+
+    assert_eq!(login_ack.program_version.major, 15);
+    assert_eq!(login_ack.program_version.minor, 0);
+    assert_eq!(login_ack.program_version.build, 4223);
+    assert_eq!(login_ack.program_version.sub_build, 0);
+
+    assert_eq!(login_ack.program_name, "Microsoft S3L Server\0\0");
+}