test: add CLI integration tests for reth binary (#22069)

Co-authored-by: DaniPopes <57450786+DaniPopes@users.noreply.github.com>
Co-authored-by: Amp <amp@ampcode.com>

bin/reth/Cargo.toml

@@ -68,8 +68,11 @@ aquamarine.workspace = true
 clap = { workspace = true, features = ["derive", "env"] }
 
 [dev-dependencies]
+alloy-node-bindings = "1.6.3"
+alloy-provider = { workspace = true, features = ["reqwest"] }
 backon.workspace = true
 tempfile.workspace = true
+tokio = { workspace = true, features = ["macros", "rt-multi-thread"] }
 
 [features]
 default = [

bin/reth/tests/it/main.rs

@@ -0,0 +1,67 @@
+#![allow(missing_docs)]
+
+use std::process::Command;
+
+const RETH: &str = env!("CARGO_BIN_EXE_reth");
+
+#[test]
+fn help() {
+    let output = Command::new(RETH).arg("--help").output().unwrap();
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(output.status.success());
+    assert!(stdout.contains("Usage"), "stdout: {stdout}");
+    assert!(stdout.contains("node"), "stdout: {stdout}");
+}
+
+#[test]
+fn version() {
+    let output = Command::new(RETH).arg("--version").output().unwrap();
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(output.status.success());
+    assert!(stdout.to_lowercase().contains("reth"), "stdout: {stdout}");
+}
+
+#[test]
+fn node_help() {
+    let output = Command::new(RETH).args(["node", "--help"]).output().unwrap();
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    assert!(output.status.success());
+    assert!(stdout.contains("--dev"), "stdout: {stdout}");
+    assert!(stdout.contains("--http"), "stdout: {stdout}");
+}
+
+#[test]
+fn unknown_subcommand() {
+    let output = Command::new(RETH).arg("definitely-not-a-cmd").output().unwrap();
+    assert!(!output.status.success());
+}
+
+#[test]
+fn unknown_flag() {
+    let output = Command::new(RETH).args(["node", "--no-such-flag"]).output().unwrap();
+    let stderr = String::from_utf8_lossy(&output.stderr);
+    assert!(!output.status.success());
+    assert!(stderr.contains("--no-such-flag"), "stderr: {stderr}");
+}
+
+#[tokio::test]
+async fn dev_node_eth_syncing() {
+    use alloy_node_bindings::Reth;
+    use alloy_provider::{Provider, ProviderBuilder};
+
+    let reth = Reth::at(RETH)
+        .dev()
+        .disable_discovery()
+        .args(["--max-outbound-peers", "0", "--max-inbound-peers", "0"])
+        .spawn();
+
+    let provider = ProviderBuilder::new().connect_http(reth.endpoint().parse().unwrap());
+
+    // give the node a moment to fully initialize
+    tokio::time::sleep(std::time::Duration::from_secs(1)).await;
+
+    // eth_syncing should not fail on a dev node
+    let _syncing = provider.syncing().await.expect("eth_syncing failed");
+}
+
+const fn main() {}