run: test that error from one op stops the others

Adds a regression test which verifies that if an operation is stopped
due to an error, then other operations will be stopped as well. This
issue was found during the review of this pull request, it was not
present in master version this PR was based on.

Author: piodul

src/run.rs

@@ -621,4 +621,33 @@ mod tests {
         test(21, 20, true).await;
         test(30, 20, true).await;
     }
+
+    #[tokio::test]
+    #[ntest::timeout(1000)]
+    async fn test_stops_after_one_fails() {
+        struct Op(bool);
+
+        make_runnable!(Op);
+        impl Op {
+            async fn execute(&mut self, _ctx: &OperationContext) -> Result<ControlFlow<()>> {
+                // Yield so that we don't get stuck in a loop and block the executor thread
+                tokio::task::yield_now().await;
+                if self.0 {
+                    Ok(ControlFlow::Continue(()))
+                } else {
+                    Err(anyhow::anyhow!("error"))
+                }
+            }
+        }
+
+        let counter = AtomicU64::new(0);
+        let mut cfg = make_test_cfg(move || {
+            let id = counter.fetch_add(1, Ordering::Relaxed);
+            Op(id > 0) // Operation with id==0 always fail, others always succeed
+        });
+        cfg.concurrency = 3;
+
+        let (_, fut) = run(cfg);
+        fut.await.unwrap_err(); // Error from one task should stop other tasks
+    }
 }