1 files changed, 16 insertions, 0 deletions
diff --git a/third_party/rust/futures/tests/future_inspect.rs b/third_party/rust/futures/tests/future_inspect.rs
new file mode 100644
index 0000000000..eacd1f78a2
--- /dev/null
+++ b/third_party/rust/futures/tests/future_inspect.rs
@@ -0,0 +1,16 @@
+use futures::executor::block_on;
+use futures::future::{self, FutureExt};
+
+#[test]
+fn smoke() {
+    let mut counter = 0;
+
+    {
+        let work = future::ready::<i32>(40).inspect(|val| {
+            counter += *val;
+        });
+        assert_eq!(block_on(work), 40);
+    }
+
+    assert_eq!(counter, 40);
+}