Integration Test: RandomlyKill wait rpc are ready before send rpc req…

…uest

test/src/rpc.rs

@@ -173,6 +173,16 @@ impl RpcClient {
             .expect("rpc call set_ban")
     }
 
+    pub fn wait_rpc_ready(&self) {
+        let now = std::time::Instant::now();
+        while self.inner.get_tip_block_number().is_err() {
+            std::thread::sleep(std::time::Duration::from_millis(100));
+            if now.elapsed() > std::time::Duration::from_secs(60) {
+                panic!("wait rpc ready timeout");
+            }
+        }
+    }
+
     pub fn get_block_template(
         &self,
         bytes_limit: Option<u64>,

test/src/specs/fault_injection/randomly_kill.rs

@@ -12,6 +12,7 @@ impl Spec for RandomlyKill {
         let mut rng = thread_rng();
         let node = &mut nodes[0];
         for _ in 0..rng.gen_range(10..20) {
+            node.rpc_client().wait_rpc_ready();
             let n = rng.gen_range(0..10);
             // TODO: the kill of child process and mining are actually sequential here
             // We need to find some way to so these two things in parallel.