From 9f33b2dc3217d78b049b05b3eb1d05126809226c Mon Sep 17 00:00:00 2001
From: Chris Olszewski <chris.olszewski@temporal.io>
Date: Fri, 4 Sep 2026 09:50:51 -0400
Subject: [PATCH] test(rust): add child_workflow/signal

---
 features/child_workflow/signal/feature.rs | 92 +++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 features/child_workflow/signal/feature.rs

diff --git a/features/child_workflow/signal/feature.rs b/features/child_workflow/signal/feature.rs
new file mode 100644
index 00000000..952f8bd9
--- /dev/null
+++ b/features/child_workflow/signal/feature.rs
@@ -0,0 +1,92 @@
+use anyhow::{Result, ensure};
+use std::time::Duration;
+use temporalio_client::WorkflowGetResultOptions;
+use temporalio_features_harness::{Feature, FeatureContext, async_trait};
+use temporalio_macros::{workflow, workflow_methods};
+use temporalio_sdk::{
+    ChildWorkflowOptions, SignalWorkflowOptions, SyncWorkflowContext, WorkerOptions, WorkflowContext, WorkflowResult,
+};
+
+const UNBLOCK_MESSAGE: &str = "unblock";
+
+#[workflow]
+#[derive(Default)]
+pub struct SignalChildWorkflow {
+    message: Option<String>,
+}
+
+#[workflow_methods]
+impl SignalChildWorkflow {
+    #[run]
+    pub async fn run(ctx: &mut WorkflowContext<Self>) -> WorkflowResult<String> {
+        ctx.wait_condition(|state| state.message.is_some()).await?;
+        Ok(ctx.state(|state| state.message.clone().unwrap_or_default()))
+    }
+
+    #[signal(name = "unblock-signal")]
+    pub fn unblock(&mut self, _ctx: &mut SyncWorkflowContext<Self>, message: String) {
+        self.message = Some(message);
+    }
+}
+
+#[workflow]
+#[derive(Default)]
+pub struct SignalWorkflow;
+
+#[workflow_methods]
+impl SignalWorkflow {
+    #[run]
+    pub async fn run(ctx: &mut WorkflowContext<Self>) -> WorkflowResult<String> {
+        let child = ctx
+            .start_child_workflow(
+                SignalChildWorkflow::run,
+                (),
+                ChildWorkflowOptions::builder()
+                    .workflow_id("signal-child".to_owned())
+                    .execution_timeout(Duration::from_secs(600))
+                    .task_timeout(Duration::from_secs(60))
+                    .build(),
+            )
+            .await?;
+        child
+            .signal(
+                SignalChildWorkflow::unblock,
+                UNBLOCK_MESSAGE.to_owned(),
+                SignalWorkflowOptions::default(),
+            )
+            .await?;
+        Ok(child.result().await?)
+    }
+}
+
+struct SignalChildFeature;
+
+#[async_trait]
+impl Feature for SignalChildFeature {
+    fn worker_options(&self, mut worker_options: WorkerOptions) -> Result<WorkerOptions> {
+        worker_options
+            .register_workflow::<SignalWorkflow>()?
+            .register_workflow::<SignalChildWorkflow>()?;
+        Ok(worker_options)
+    }
+
+    async fn execute(&self, context: FeatureContext) -> Result<()> {
+        let handle = context
+            .client
+            .start_workflow(
+                SignalWorkflow::run,
+                (),
+                context.workflow_start_options(),
+            )
+            .await?;
+        let result = handle
+            .get_result(WorkflowGetResultOptions::default())
+            .await?;
+        ensure!(result == UNBLOCK_MESSAGE, "unexpected signal result: {result}");
+        Ok(())
+    }
+}
+
+pub fn feature() -> impl Feature {
+    SignalChildFeature
+}