editoast: add Deadlocks comment

editoast/editoast_models/src/db_connection_pool.rs

@@ -134,6 +134,14 @@ impl DbConnectionPoolV2 {
     /// # }
     /// ```
     ///
+    /// ### Deadlocks
+    ///
+    /// We encountered a deadlock error in our tests,
+    /// especially those using `empty_infra` and `small_infra`.
+    /// Adding `#[serial_test::serial]` solved the issue.
+    /// We tried increasing the deadlock timeout, but that didn't work.
+    /// Using random `infra_id` with rand didn't help either.
+    ///
     /// ## Guidelines
     ///
     /// To prevent these issues, prefer the following patterns:

editoast/src/generated_data/mod.rs

@@ -172,7 +172,10 @@ pub mod tests {
     use crate::modelsv2::fixtures::create_empty_infra;
     use editoast_models::DbConnectionPoolV2;
 
-    #[rstest] // Slow test
+    #[rstest]
+    // Slow test
+    // PostgreSQL deadlock can happen in this test, see section `Deadlock` of [DbConnectionPoolV2::get] for more information
+    #[serial_test::serial]
     async fn refresh_all_test() {
         let db_pool = DbConnectionPoolV2::for_tests();
         let infra = create_empty_infra(db_pool.get_ok().deref_mut()).await;

editoast/src/modelsv2/infra.rs

@@ -333,6 +333,8 @@ pub mod tests {
     }
 
     #[rstest]
+    // PostgreSQL deadlock can happen in this test, see section `Deadlock` of [DbConnectionPoolV2::get] for more information
+    #[serial_test::serial]
     async fn clone_infra_with_new_name_returns_new_cloned_infra() {
         // GIVEN
         let db_pool = DbConnectionPoolV2::for_tests();

editoast/src/views/infra/mod.rs

@@ -884,7 +884,10 @@ pub mod tests {
         assert_eq!(refreshed_infras.infra_refreshed, vec![empty_infra.id]);
     }
 
-    #[rstest] // Slow test
+    #[rstest]
+    // Slow test
+    // PostgreSQL deadlock can happen in this test, see section `Deadlock` of [DbConnectionPoolV2::get] for more information
+    #[serial_test::serial]
     async fn infra_refresh_force() {
         let app = TestAppBuilder::default_app();
         let db_pool = app.db_pool();

editoast/src/views/infra/railjson.rs

@@ -196,6 +196,7 @@ mod tests {
     use editoast_schemas::infra::SwitchType;
 
     #[rstest]
+    // PostgreSQL deadlock can happen in this test, see section `Deadlock` of [DbConnectionPoolV2::get] for more information
     #[serial_test::serial]
     async fn test_get_railjson() {
         let app = TestAppBuilder::default_app();
@@ -221,6 +222,7 @@ mod tests {
     }
 
     #[rstest]
+    // PostgreSQL deadlock can happen in this test, see section `Deadlock` of [DbConnectionPoolV2::get] for more information
     #[serial_test::serial]
     async fn test_post_railjson() {
         let app = TestAppBuilder::default_app();