f Give backoff poll max tries

Author: tnull

src/tests/functional_tests.rs

@@ -91,6 +91,7 @@ fn wait_for_outpoint_spend(outpoint: OutPoint) {
 		if is_spent {
 			break;
 		}
+
 		is_spent = exponential_backoff_poll(|| {
 			get_electrsd().trigger().unwrap();
 			get_electrsd().client.ping().unwrap();
@@ -104,13 +105,18 @@ where
 	F: FnMut() -> Option<T>,
 {
 	let mut delay = Duration::from_millis(64);
+	let mut tries = 0;
 	loop {
 		match poll() {
 			Some(data) => break data,
-			None if delay.as_millis() < 512 => delay = delay.mul_f32(2.0),
+			None if delay.as_millis() < 512 => {
+				delay = delay.mul_f32(2.0);
+			}
+
 			None => {}
 		}
-
+		assert!(tries < 10, "Reached max tries.");
+		tries += 1;
 		std::thread::sleep(delay);
 	}
 }