feat: dagrunner, initial version

tests/execution/basic.rs

@@ -0,0 +1,164 @@
+// Basic execution tests for DagRunner
+use crate::common::task_fn;
+
+use dagx::*;
+
+#[tokio::test]
+async fn test_empty_dag() {
+    let dag = DagRunner::new();
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap(); // Should complete without error
+}
+
+#[tokio::test]
+async fn test_single_task() {
+    let dag = DagRunner::new();
+    let task = dag.add_task(task_fn(|_: ()| async { 42 }));
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+    assert_eq!(dag.get(task).unwrap(), 42);
+}
+
+#[tokio::test]
+async fn test_deep_chain() {
+    let dag = DagRunner::new();
+
+    let a = dag.add_task(task_fn(|_: ()| async { 1 }));
+    let b = dag
+        .add_task(task_fn(|x: i32| async move { x + 1 }))
+        .depends_on(&a);
+    let c = dag
+        .add_task(task_fn(|x: i32| async move { x + 1 }))
+        .depends_on(b);
+    let d = dag
+        .add_task(task_fn(|x: i32| async move { x + 1 }))
+        .depends_on(c);
+    let e = dag
+        .add_task(task_fn(|x: i32| async move { x + 1 }))
+        .depends_on(d);
+
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+
+    // Note: a, b, c, d are not sinks (they have dependents in the chain)
+    // Only e is a sink and can be retrieved
+    assert_eq!(dag.get(e).unwrap(), 5);
+}
+
+#[tokio::test]
+async fn test_wide_parallel() {
+    let dag = DagRunner::new();
+
+    let tasks: Vec<_> = (0..10)
+        .map(|i| dag.add_task(task_fn(move |_: ()| async move { i * 2 })))
+        .collect();
+
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+
+    for (i, task) in tasks.iter().enumerate() {
+        assert_eq!(dag.get(task).unwrap(), i * 2);
+    }
+}
+
+#[tokio::test]
+async fn test_diamond_dependency() {
+    let dag = DagRunner::new();
+
+    let a = dag.add_task(task_fn(|_: ()| async { 10 }));
+    let b = dag
+        .add_task(task_fn(|x: i32| async move { x + 5 }))
+        .depends_on(&a);
+    let c = dag
+        .add_task(task_fn(|x: i32| async move { x * 2 }))
+        .depends_on(&a);
+    let d = dag
+        .add_task(task_fn(|(x, y): (i32, i32)| async move { x + y }))
+        .depends_on((&b, &c));
+
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+
+    // Note: a, b, and c are not sinks (they have dependents)
+    // Only d is a sink and can be retrieved
+    assert_eq!(dag.get(d).unwrap(), 35); // 15 + 20
+}
+
+#[derive(Clone)]
+struct User {
+    name: String,
+    age: u32,
+}
+
+#[tokio::test]
+async fn test_different_output_types() {
+    let dag = DagRunner::new();
+
+    let string_task = dag.add_task(task_fn(|_: ()| async { "hello".to_string() }));
+    let vec_task = dag.add_task(task_fn(|_: ()| async { vec![1, 2, 3] }));
+    let struct_task = dag.add_task(task_fn(|_: ()| async {
+        User {
+            name: "Alice".to_string(),
+            age: 30,
+        }
+    }));
+
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap();
+
+    assert_eq!(&dag.get(string_task).unwrap(), "hello");
+    assert_eq!(dag.get(vec_task).unwrap(), vec![1, 2, 3]);
+    let user = dag.get(struct_task).unwrap();
+    assert_eq!(user.name, "Alice");
+    assert_eq!(user.age, 30);
+}
+
+#[tokio::test]
+async fn test_multiple_sinks() {
+    let dag = DagRunner::new();
+
+    let source = dag.add_task(task_fn(|_: ()| async { 10 }));
+
+    // Branch 1
+    let branch1 = dag
+        .add_task(task_fn(|x: i32| async move { x * 2 }))
+        .depends_on(&source);
+    let sink1 = dag
+        .add_task(task_fn(|x: i32| async move { x + 1 }))
+        .depends_on(branch1);
+
+    // Branch 2
+    let branch2 = dag
+        .add_task(task_fn(|x: i32| async move { x + 5 }))
+        .depends_on(&source);
+    let sink2 = dag
+        .add_task(task_fn(|x: i32| async move { x * 3 }))
+        .depends_on(branch2);
+
+    dag.run(|fut| {
+        tokio::spawn(fut);
+    })
+    .await
+    .unwrap(); // Should wait for both sinks
+
+    assert_eq!(dag.get(sink1).unwrap(), 21); // (10 * 2) + 1
+    assert_eq!(dag.get(sink2).unwrap(), 45); // (10 + 5) * 3
+}