test(fspy): run node fs tests with Deno

Co-authored-by: GPT-5 Codex <codex@openai.com>

Author: wan9chi

Cargo.lock

@@ -43,6 +43,7 @@ tempfile = { workspace = true }
 anyhow = { workspace = true }
 csv-async = { workspace = true }
 ctor = { workspace = true }
+ntest = { workspace = true }
 subprocess_test = { workspace = true, features = ["fspy"] }
 test-log = { workspace = true }
 tokio = { workspace = true, features = ["rt-multi-thread", "macros", "fs", "io-std"] }

crates/fspy/Cargo.toml

@@ -1,112 +1,159 @@
 mod test_utils;
 
 use std::{
-    env::{current_dir, vars_os},
-    ffi::OsStr,
+    env::{current_dir, join_paths, split_paths, var_os, vars_os},
+    ffi::{OsStr, OsString},
+    iter,
+    path::PathBuf,
 };
 
 use fspy::{AccessMode, PathAccessIterable};
-use test_log::test;
+use ntest::test_case;
 use test_utils::assert_contains;
 
-async fn track_node_script(script: &str, args: &[&OsStr]) -> anyhow::Result<PathAccessIterable> {
-    let mut command = fspy::Command::new("node");
+fn resolve_runtime(runtime: &str) -> anyhow::Result<(PathBuf, OsString)> {
+    let manifest_dir = PathBuf::from(var_os("CARGO_MANIFEST_DIR").unwrap());
+    let tools_bin =
+        manifest_dir.parent().unwrap().parent().unwrap().join("packages/tools/node_modules/.bin");
+    let path =
+        join_paths(iter::once(tools_bin).chain(var_os("PATH").iter().flat_map(split_paths)))?;
+    let program = which::which_in(runtime, Some(&path), current_dir()?)?;
+    Ok((program, path))
+}
+
+fn track_script(
+    runtime: &str,
+    script: &str,
+    args: &[&OsStr],
+) -> anyhow::Result<PathAccessIterable> {
+    let (program, path) = resolve_runtime(runtime)?;
+
+    let mut command = fspy::Command::new(program);
     command
-        .arg("-e")
-        .envs(vars_os()) // https://github.com/jdx/mise/discussions/5968
-        .arg(script)
-        .args(args);
-    let child = command.spawn(tokio_util::sync::CancellationToken::new()).await?;
-    let termination = child.wait_handle.await?;
-    assert!(termination.status.success());
-    Ok(termination.path_accesses)
+        .envs(vars_os().filter(|(name, _)| !name.eq_ignore_ascii_case("PATH")))
+        .env("PATH", path); // https://github.com/jdx/mise/discussions/5968
+    let script = format!(
+        "const fs = require('node:fs'); \
+         const child_process = require('node:child_process'); \
+         {script}"
+    );
+    if runtime == "deno" {
+        command.args(["eval", "--ext=cjs"]).arg(script).args(args);
+    } else {
+        command.arg("-e").arg(script).args(args);
+    }
+
+    // `ntest::test_case` generates synchronous `#[test]` functions, so drive
+    // fspy's asynchronous process tracking from this shared helper.
+    tokio::runtime::Runtime::new()?.block_on(async {
+        let child = command.spawn(tokio_util::sync::CancellationToken::new()).await?;
+        let termination = child.wait_handle.await?;
+        assert!(termination.status.success());
+        Ok(termination.path_accesses)
+    })
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn read_sync() -> anyhow::Result<()> {
-    let accesses = track_node_script("try { fs.readFileSync('hello') } catch {}", &[]).await?;
+fn read_sync(runtime: &str) -> anyhow::Result<()> {
+    let accesses = track_script(runtime, "try { fs.readFileSync('hello') } catch {}", &[])?;
     assert_contains(&accesses, current_dir().unwrap().join("hello").as_path(), AccessMode::READ);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn exist_sync() -> anyhow::Result<()> {
-    let accesses = track_node_script("try { fs.existsSync('hello') } catch {}", &[]).await?;
+fn exist_sync(runtime: &str) -> anyhow::Result<()> {
+    let accesses = track_script(runtime, "try { fs.existsSync('hello') } catch {}", &[])?;
     assert_contains(&accesses, current_dir().unwrap().join("hello").as_path(), AccessMode::READ);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
 #[ignore = "requires node"]
-async fn stat_sync() -> anyhow::Result<()> {
-    let accesses = track_node_script("try { fs.statSync('hello') } catch {}", &[]).await?;
+#[test_case("deno")]
+#[ignore = "requires node"]
+fn stat_sync(runtime: &str) -> anyhow::Result<()> {
+    let accesses = track_script(runtime, "try { fs.statSync('hello') } catch {}", &[])?;
     assert_contains(&accesses, current_dir().unwrap().join("hello").as_path(), AccessMode::READ);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn create_read_stream() -> anyhow::Result<()> {
-    let accesses = track_node_script(
+fn create_read_stream(runtime: &str) -> anyhow::Result<()> {
+    let accesses = track_script(
+        runtime,
         "try { fs.createReadStream('hello').on('error', () => {}) } catch {}",
         &[],
-    )
-    .await?;
+    )?;
     assert_contains(&accesses, current_dir().unwrap().join("hello").as_path(), AccessMode::READ);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn create_write_stream() -> anyhow::Result<()> {
+fn create_write_stream(runtime: &str) -> anyhow::Result<()> {
     let tmpdir = tempfile::tempdir()?;
     let file_path = tmpdir.path().join("hello");
-    let accesses = track_node_script(
-        "try { fs.createWriteStream(process.argv[1]).on('error', () => {}) } catch {}",
+    let accesses = track_script(
+        runtime,
+        "try { fs.createWriteStream(process.argv.at(-1)).on('error', () => {}) } catch {}",
         &[file_path.as_os_str()],
-    )
-    .await?;
+    )?;
     assert_contains(&accesses, file_path.as_path(), AccessMode::WRITE);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
 #[ignore = "requires node"]
-async fn write_sync() -> anyhow::Result<()> {
+#[test_case("deno")]
+#[ignore = "requires node"]
+fn write_sync(runtime: &str) -> anyhow::Result<()> {
     let tmpdir = tempfile::tempdir()?;
     let file_path = tmpdir.path().join("hello");
-    let accesses = track_node_script(
-        "try { fs.writeFileSync(process.argv[1], '') } catch {}",
+    let accesses = track_script(
+        runtime,
+        "try { fs.writeFileSync(process.argv.at(-1), '') } catch {}",
         &[file_path.as_os_str()],
-    )
-    .await?;
+    )?;
     assert_contains(&accesses, &file_path, AccessMode::WRITE);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn read_dir_sync() -> anyhow::Result<()> {
-    let accesses = track_node_script("try { fs.readdirSync('.') } catch {}", &[]).await?;
+fn read_dir_sync(runtime: &str) -> anyhow::Result<()> {
+    let accesses = track_script(runtime, "try { fs.readdirSync('.') } catch {}", &[])?;
     assert_contains(&accesses, &current_dir().unwrap(), AccessMode::READ_DIR);
     Ok(())
 }
 
-#[test(tokio::test)]
+#[test_case("node")]
+#[ignore = "requires node"]
+#[test_case("deno")]
 #[ignore = "requires node"]
-async fn subprocess() -> anyhow::Result<()> {
+fn subprocess(runtime: &str) -> anyhow::Result<()> {
     let cmd = if cfg!(windows) {
         r"'cmd', ['/c', 'type hello']"
     } else {
         r"'/bin/sh', ['-c', 'cat hello']"
     };
-    let accesses = track_node_script(
+    let accesses = track_script(
+        runtime,
         &format!("try {{ child_process.spawnSync({cmd}, {{ stdio: 'ignore' }}) }} catch {{}}"),
         &[],
-    )
-    .await?;
+    )?;
     assert_contains(&accesses, current_dir().unwrap().join("hello").as_path(), AccessMode::READ);
     Ok(())
 }

crates/fspy/tests/node_fs.rs

@@ -5,6 +5,7 @@
   "dependencies": {
     "@voidzero-dev/vite-task-client": "workspace:*",
     "cross-env": "catalog:",
+    "deno": "catalog:",
     "oxfmt": "catalog:",
     "oxlint": "catalog:",
     "oxlint-tsgolint": "catalog:",

packages/tools/package.json

@@ -3,10 +3,14 @@ packages:
   - packages/tools
   - packages/vite-task-client
 
+allowBuilds:
+  deno: true
+
 catalog:
   '@tsconfig/strictest': ^2.0.8
   '@types/node': 25.0.3
   cross-env: ^10.1.0
+  deno: 2.9.2
   husky: ^9.1.7
   lint-staged: ^17.0.0
   oxfmt: 0.57.0