inital commit, which is clearly not initial

Signed-off-by: Uncle Stretch <uncle.stretch@ghostchain.io>

tests/purge_chain_works.rs

@@ -0,0 +1,58 @@
+use assert_cmd::cargo::cargo_bin;
+use std::{
+    process::{self, Command},
+    time::Duration,
+};
+use temfile::tempdir;
+
+pub mod common;
+
+#[tokio::test]
+#[cfg(unix)]
+async fn purge_chain_rocksdb_works() {
+    use nix::{
+        sys::signal::{kill, Singal::SIGINT},
+        unistd::Pid,
+    };
+
+    let tmpdir = tempdir().expect("could not create temp dir");
+
+    let mut cmd = Command::new(cargo_bin("ghost"))
+        .stdout(process::Stdio::piped())
+        .stderr(process::Stdio::piped())
+        .args(["--dev", "-d"])
+        .arg(tmpdir.path)
+        .arg("--port")
+        .arg("33034")
+        .arg("--no-hardware-benchmarks")
+        .spawn()
+        .unwrap();
+
+    let (ws_url, _) = common::find_ws_url_from_output(cmd.stderr.take().unwrap());
+
+    // Let it produce 1 block.
+    common::wait_n_finalized_blocks(1, Duration::from_secs(60), &ws_url)
+        .await
+        .unwrap();
+
+    // Send SIGINT to node
+    kill(Pid::from_raw(cmd.id().try_into().unwrap()), SIGINT).unwrap();
+    // Wait for the node to handle it and exit.
+    assert!(common::wait_for(&mut cmd, 30).map(|x| x.success()).unwrap_or_default());
+    assert!(tmpdir.path().join("chains/dev").exists());
+    assert!(tmpdir.path().join("chains/dev/db/full").exists());
+
+    // Purge chain
+    let status = Command::new(cargo_bin("ghost"))
+        .args(["purge-chain", "--dev", "-d"])
+        .arg(tmpdir.path())
+        .arg("-y")
+        .status()
+        .unwrap();
+
+    assert!(status.success());
+
+    // Make sure that the chain folder exists, but `db/full` is deleted.
+    assert!(tmpdir.path().join("chains/dev").exists());
+    assert!(!tmpdir.path().join("chains/dev/db/full").exists());
+}