Add test for offchain-worker (#139)

Closes #10

Author: naijauser

cli/tests/offchain_worker.rs

@@ -0,0 +1,140 @@
+// This file is part of try-runtime-cli.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#![cfg(unix)]
+#![allow(deprecated)]
+
+use std::time::Duration;
+
+use assert_cmd::cargo_bin;
+use regex::Regex;
+use substrate_cli_test_utils as common;
+use tokio::process::Command;
+
+/*
+ * Test that the offchain-worker command works as expected.
+ * It spawns a local dev node, and then runs the offchain-worker command against it.
+ * The test covers two cases;
+ *   1. The offchain-worker command is run with a live state, and should complete successfully.
+ *   2. The offchain-worker command is run with a snap state, and should terminate with an error.
+ */
+#[tokio::test]
+async fn offchain_worker_works() {
+    let port = 45789;
+
+    // Spawn a dev node.
+    let _ = std::thread::spawn(move || {
+        match common::start_node_inline(vec![
+            "--no-hardware-benchmarks",
+            "--dev",
+            format!("--rpc-port={}", port).as_str(),
+        ]) {
+            Ok(_) => {}
+            Err(e) => {
+                panic!("Node exited with error: {}", e);
+            }
+        }
+    });
+
+    // Wait some time to ensure that the node is warmed up.
+    std::thread::sleep(Duration::from_secs(90));
+
+    // 1. Test that the command runs successfully with a live state.
+    common::run_with_timeout(Duration::from_secs(60), async move {
+        let ws_url = format!("ws://localhost:{}", port);
+
+        fn run_offchain_worker(ws_url: &str) -> tokio::process::Child {
+            let path = cargo_bin!("try-runtime");
+
+            assert!(
+                path.exists(),
+                "try-runtime binary not found at path: {}",
+                path.display()
+            );
+
+            Command::new(path)
+                .stdout(std::process::Stdio::piped())
+                .stderr(std::process::Stdio::piped())
+                .arg("--runtime=existing")
+                .arg("offchain-worker")
+                .args(["live", format!("--uri={}", ws_url).as_str()])
+                .kill_on_drop(true)
+                .spawn()
+                .unwrap()
+        }
+
+        // Try to run offchain-worker command
+        let offchain_execution = run_offchain_worker(&ws_url);
+
+        // Assert that command runs to completion successfully
+        assert!(offchain_execution
+            .wait_with_output()
+            .await
+            .unwrap()
+            .status
+            .success());
+    })
+    .await;
+
+    // 2. Test attempting to use non-live state. Should terminate with error.
+    common::run_with_timeout(Duration::from_secs(60), async move {
+        let ws_url = format!("ws://localhost:{}", port);
+
+        fn run_offchain_worker_snap_state(ws_url: &str) -> tokio::process::Child {
+            let path = cargo_bin!("try-runtime");
+
+            assert!(
+                path.exists(),
+                "try-runtime binary not found at path: {}",
+                path.display()
+            );
+
+            let project_root = env!("CARGO_MANIFEST_DIR");
+            let snap_file_path = format!("{}/tests/snaps/rococo-people.snap", project_root);
+
+            Command::new(path)
+                .stdout(std::process::Stdio::piped())
+                .stderr(std::process::Stdio::piped())
+                .arg("--runtime=existing")
+                .arg("offchain-worker")
+                .args(["--header-ws-uri", ws_url])
+                .args(["snap", "--path", snap_file_path.as_str()])
+                .kill_on_drop(true)
+                .spawn()
+                .unwrap()
+        }
+
+        // Try to execute command
+        let mut offchain_execution = run_offchain_worker_snap_state(&ws_url);
+        let expected_output = r"execute block currently only supports Live state";
+        let re = Regex::new(expected_output).unwrap();
+        let matched =
+            common::wait_for_stream_pattern_match(offchain_execution.stderr.take().unwrap(), re)
+                .await;
+
+        assert!(matched.is_ok());
+
+        // Assert that the command did not exit successfully
+        assert!(!offchain_execution
+            .wait_with_output()
+            .await
+            .unwrap()
+            .status
+            .success());
+    })
+    .await;
+}