chore: move `test_util` to `tests/util/server` (#22444)

As discussed with @mmastrac.

---------

Signed-off-by: Asher Gomez <ashersaupingomez@gmail.com>
Co-authored-by: Matt Mastracci <matthew@mastracci.com>

1 files changed, 997 insertions, 0 deletions

diff --git a/tests/util/server/src/builders.rs b/tests/util/server/src/builders.rs
new file mode 100644
index 000000000..d8c209dd7
--- /dev/null
+++ b/tests/util/server/src/builders.rs
@@ -0,0 +1,997 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::collections::HashSet;
+use std::ffi::OsStr;
+use std::ffi::OsString;
+use std::io::Read;
+use std::io::Write;
+use std::ops::Deref;
+use std::ops::DerefMut;
+use std::path::Path;
+use std::path::PathBuf;
+use std::process::Child;
+use std::process::Command;
+use std::process::Stdio;
+use std::rc::Rc;
+
+use os_pipe::pipe;
+
+use crate::assertions::assert_wildcard_match;
+use crate::deno_exe_path;
+use crate::denort_exe_path;
+use crate::env_vars_for_jsr_tests;
+use crate::env_vars_for_npm_tests;
+use crate::fs::PathRef;
+use crate::http_server;
+use crate::jsr_registry_unset_url;
+use crate::lsp::LspClientBuilder;
+use crate::npm_registry_unset_url;
+use crate::pty::Pty;
+use crate::strip_ansi_codes;
+use crate::testdata_path;
+use crate::HttpServerGuard;
+use crate::TempDir;
+
+// Gives the developer a nice error message if they have a deno configuration
+// file that will be auto-discovered by the tests and cause a lot of failures.
+static HAS_DENO_JSON_IN_WORKING_DIR_ERR: once_cell::sync::Lazy<Option<String>> =
+  once_cell::sync::Lazy::new(|| {
+    let testdata_path = testdata_path();
+    let mut current_dir = testdata_path.as_path();
+    let deno_json_names = ["deno.json", "deno.jsonc"];
+    loop {
+      for name in deno_json_names {
+        let deno_json_path = current_dir.join(name);
+        if deno_json_path.exists() {
+          return Some(format!(
+            concat!(
+              "Found deno configuration file at {}. The test suite relies on ",
+              "a deno.json not existing in any ancestor directory. Please ",
+              "delete this file so the tests won't auto-discover it.",
+            ),
+            deno_json_path.display(),
+          ));
+        }
+      }
+      if let Some(parent) = current_dir.parent() {
+        current_dir = parent;
+      } else {
+        break;
+      }
+    }
+
+    None
+  });
+
+#[derive(Default)]
+pub struct TestContextBuilder {
+  use_http_server: bool,
+  use_temp_cwd: bool,
+  use_symlinked_temp_dir: bool,
+  /// Copies the files at the specified directory in the "testdata" directory
+  /// to the temp folder and runs the test from there. This is useful when
+  /// the test creates files in the testdata directory (ex. a node_modules folder)
+  copy_temp_dir: Option<String>,
+  temp_dir_path: Option<PathBuf>,
+  cwd: Option<String>,
+  envs: HashMap<String, String>,
+}
+
+impl TestContextBuilder {
+  pub fn new() -> Self {
+    Self::default().add_compile_env_vars()
+  }
+
+  pub fn for_npm() -> Self {
+    Self::new().use_http_server().add_npm_env_vars()
+  }
+
+  pub fn for_jsr() -> Self {
+    Self::new().use_http_server().add_jsr_env_vars()
+  }
+
+  pub fn temp_dir_path(mut self, path: impl AsRef<Path>) -> Self {
+    self.temp_dir_path = Some(path.as_ref().to_path_buf());
+    self
+  }
+
+  pub fn use_http_server(mut self) -> Self {
+    self.use_http_server = true;
+    self
+  }
+
+  pub fn use_temp_cwd(mut self) -> Self {
+    self.use_temp_cwd = true;
+    self
+  }
+
+  /// Causes the temp directory to be symlinked to a target directory
+  /// which is useful for debugging issues that only show up on the CI.
+  ///
+  /// Note: This method is not actually deprecated, it's just the CI
+  /// does this by default so there's no need to check in any code that
+  /// uses this into the repo. This is just for debugging purposes.
+  #[deprecated]
+  pub fn use_symlinked_temp_dir(mut self) -> Self {
+    self.use_symlinked_temp_dir = true;
+    self
+  }
+
+  /// Copies the files at the specified directory in the "testdata" directory
+  /// to the temp folder and runs the test from there. This is useful when
+  /// the test creates files in the testdata directory (ex. a node_modules folder)
+  pub fn use_copy_temp_dir(mut self, dir: impl AsRef<str>) -> Self {
+    self.copy_temp_dir = Some(dir.as_ref().to_string());
+    self
+  }
+
+  pub fn cwd(mut self, cwd: impl AsRef<str>) -> Self {
+    self.cwd = Some(cwd.as_ref().to_string());
+    self
+  }
+
+  pub fn envs<I, K, V>(self, vars: I) -> Self
+  where
+    I: IntoIterator<Item = (K, V)>,
+    K: AsRef<str>,
+    V: AsRef<str>,
+  {
+    let mut this = self;
+    for (key, value) in vars {
+      this = this.env(key, value);
+    }
+    this
+  }
+
+  pub fn env(mut self, key: impl AsRef<str>, value: impl AsRef<str>) -> Self {
+    self
+      .envs
+      .insert(key.as_ref().to_string(), value.as_ref().to_string());
+    self
+  }
+
+  pub fn add_npm_env_vars(mut self) -> Self {
+    for (key, value) in env_vars_for_npm_tests() {
+      self = self.env(key, value);
+    }
+    self
+  }
+
+  pub fn add_compile_env_vars(mut self) -> Self {
+    // The `denort` binary is in the same artifact directory as the `deno` binary.
+    let denort_bin = denort_exe_path();
+    self = self.env("DENORT_BIN", denort_bin.to_string());
+    self
+  }
+
+  pub fn add_future_env_vars(mut self) -> Self {
+    self = self.env("DENO_FUTURE", "1");
+    self
+  }
+
+  pub fn add_jsr_env_vars(mut self) -> Self {
+    for (key, value) in env_vars_for_jsr_tests() {
+      self = self.env(key, value);
+    }
+    self
+  }
+
+  pub fn build(&self) -> TestContext {
+    if let Some(err) = &*HAS_DENO_JSON_IN_WORKING_DIR_ERR {
+      panic!("{}", err);
+    }
+
+    let temp_dir_path = self
+      .temp_dir_path
+      .clone()
+      .unwrap_or_else(std::env::temp_dir);
+    let deno_dir = TempDir::new_in(&temp_dir_path);
+    let temp_dir = TempDir::new_in(&temp_dir_path);
+    let temp_dir = if self.use_symlinked_temp_dir {
+      TempDir::new_symlinked(temp_dir)
+    } else {
+      temp_dir
+    };
+    if let Some(temp_copy_dir) = &self.copy_temp_dir {
+      let test_data_path = testdata_path().join(temp_copy_dir);
+      let temp_copy_dir = temp_dir.path().join(temp_copy_dir);
+      temp_copy_dir.create_dir_all();
+      test_data_path.copy_to_recursive(&temp_copy_dir);
+    }
+
+    let deno_exe = deno_exe_path();
+    println!("deno_exe path {}", deno_exe);
+
+    let http_server_guard = if self.use_http_server {
+      Some(Rc::new(http_server()))
+    } else {
+      None
+    };
+
+    let cwd = if self.use_temp_cwd || self.copy_temp_dir.is_some() {
+      temp_dir.path().to_owned()
+    } else {
+      testdata_path().clone()
+    };
+    let cwd = match &self.cwd {
+      Some(specified_cwd) => cwd.join(specified_cwd),
+      None => cwd,
+    };
+
+    TestContext {
+      cwd,
+      deno_exe,
+      envs: self.envs.clone(),
+      _http_server_guard: http_server_guard,
+      deno_dir,
+      temp_dir,
+    }
+  }
+}
+
+#[derive(Clone)]
+pub struct TestContext {
+  deno_exe: PathRef,
+  envs: HashMap<String, String>,
+  cwd: PathRef,
+  _http_server_guard: Option<Rc<HttpServerGuard>>,
+  deno_dir: TempDir,
+  temp_dir: TempDir,
+}
+
+impl Default for TestContext {
+  fn default() -> Self {
+    TestContextBuilder::default().build()
+  }
+}
+
+impl TestContext {
+  pub fn with_http_server() -> Self {
+    TestContextBuilder::new().use_http_server().build()
+  }
+
+  pub fn deno_dir(&self) -> &TempDir {
+    &self.deno_dir
+  }
+
+  pub fn temp_dir(&self) -> &TempDir {
+    &self.temp_dir
+  }
+
+  pub fn new_command(&self) -> TestCommandBuilder {
+    TestCommandBuilder::new(self.deno_dir.clone())
+      .envs(self.envs.clone())
+      .current_dir(&self.cwd)
+  }
+
+  pub fn new_lsp_command(&self) -> LspClientBuilder {
+    LspClientBuilder::new_with_dir(self.deno_dir.clone())
+      .deno_exe(&self.deno_exe)
+      .set_root_dir(self.temp_dir.path().clone())
+  }
+
+  pub fn run_npm(&self, args: impl AsRef<str>) {
+    self
+      .new_command()
+      .name("npm")
+      .args(args)
+      .run()
+      .skip_output_check();
+  }
+
+  pub fn get_jsr_package_integrity(&self, sub_path: &str) -> String {
+    fn get_checksum(bytes: &[u8]) -> String {
+      use sha2::Digest;
+      let mut hasher = sha2::Sha256::new();
+      hasher.update(bytes);
+      format!("{:x}", hasher.finalize())
+    }
+
+    let url = url::Url::parse(self.envs.get("JSR_URL").unwrap()).unwrap();
+    let url = url.join(&format!("{}_meta.json", sub_path)).unwrap();
+    let bytes = sync_fetch(url);
+    get_checksum(&bytes)
+  }
+}
+
+fn sync_fetch(url: url::Url) -> bytes::Bytes {
+  let runtime = tokio::runtime::Builder::new_current_thread()
+    .enable_io()
+    .enable_time()
+    .build()
+    .unwrap();
+  runtime.block_on(async move {
+    let client = reqwest::Client::new();
+    let response = client.get(url).send().await.unwrap();
+    assert!(response.status().is_success());
+    response.bytes().await.unwrap()
+  })
+}
+
+/// We can't clone an stdio, so if someone clones a DenoCmd,
+/// we want to set this to `Cloned` and show the user a helpful
+/// panic message.
+enum StdioContainer {
+  Cloned,
+  Inner(RefCell<Option<Stdio>>),
+}
+
+impl Clone for StdioContainer {
+  fn clone(&self) -> Self {
+    Self::Cloned
+  }
+}
+
+impl StdioContainer {
+  pub fn new(stdio: Stdio) -> Self {
+    Self::Inner(RefCell::new(Some(stdio)))
+  }
+
+  pub fn take(&self) -> Stdio {
+    match self {
+      StdioContainer::Cloned => panic!("Cannot run a command after it was cloned. You need to reset the stdio value."),
+      StdioContainer::Inner(inner) => {
+        match inner.borrow_mut().take() {
+          Some(value) => value,
+          None => panic!("Cannot run a command that was previously run. You need to reset the stdio value between runs."),
+        }
+      },
+    }
+  }
+}
+
+#[derive(Clone)]
+pub struct TestCommandBuilder {
+  deno_dir: TempDir,
+  stdin: Option<StdioContainer>,
+  stdout: Option<StdioContainer>,
+  stderr: Option<StdioContainer>,
+  stdin_text: Option<String>,
+  command_name: String,
+  cwd: Option<PathRef>,
+  envs: HashMap<String, String>,
+  envs_remove: HashSet<String>,
+  env_clear: bool,
+  args_text: String,
+  args_vec: Vec<String>,
+  split_output: bool,
+  skip_strip_ansi: bool,
+}
+
+impl TestCommandBuilder {
+  pub fn new(deno_dir: TempDir) -> Self {
+    Self {
+      deno_dir,
+      stdin: None,
+      stdout: None,
+      stderr: None,
+      stdin_text: None,
+      split_output: false,
+      skip_strip_ansi: false,
+      cwd: None,
+      envs: Default::default(),
+      envs_remove: Default::default(),
+      env_clear: false,
+      command_name: "deno".to_string(),
+      args_text: "".to_string(),
+      args_vec: Default::default(),
+    }
+  }
+
+  pub fn name(mut self, name: impl AsRef<OsStr>) -> Self {
+    self.command_name = name.as_ref().to_string_lossy().to_string();
+    self
+  }
+
+  pub fn args(mut self, args: impl AsRef<str>) -> Self {
+    self.args_text = args.as_ref().to_string();
+    self
+  }
+
+  pub fn args_vec<I, S>(mut self, args: I) -> Self
+  where
+    I: IntoIterator<Item = S>,
+    S: AsRef<std::ffi::OsStr>,
+  {
+    self.args_vec.extend(
+      args
+        .into_iter()
+        .map(|s| s.as_ref().to_string_lossy().to_string()),
+    );
+    self
+  }
+
+  pub fn arg<S>(mut self, arg: S) -> Self
+  where
+    S: AsRef<std::ffi::OsStr>,
+  {
+    self
+      .args_vec
+      .push(arg.as_ref().to_string_lossy().to_string());
+    self
+  }
+
+  pub fn env_clear(mut self) -> Self {
+    self.env_clear = true;
+    self
+  }
+
+  pub fn envs<I, K, V>(self, vars: I) -> Self
+  where
+    I: IntoIterator<Item = (K, V)>,
+    K: AsRef<std::ffi::OsStr>,
+    V: AsRef<std::ffi::OsStr>,
+  {
+    let mut this = self;
+    for (key, value) in vars {
+      this = this.env(key, value);
+    }
+    this
+  }
+
+  pub fn env<K, V>(mut self, key: K, val: V) -> Self
+  where
+    K: AsRef<std::ffi::OsStr>,
+    V: AsRef<std::ffi::OsStr>,
+  {
+    self.envs.insert(
+      key.as_ref().to_string_lossy().to_string(),
+      val.as_ref().to_string_lossy().to_string(),
+    );
+    self
+  }
+
+  pub fn env_remove<K>(mut self, key: K) -> Self
+  where
+    K: AsRef<std::ffi::OsStr>,
+  {
+    self
+      .envs_remove
+      .insert(key.as_ref().to_string_lossy().to_string());
+    self
+  }
+
+  pub fn skip_strip_ansi(mut self) -> Self {
+    self.skip_strip_ansi = true;
+    self
+  }
+
+  pub fn stdin<T: Into<Stdio>>(mut self, cfg: T) -> Self {
+    self.stdin = Some(StdioContainer::new(cfg.into()));
+    self
+  }
+
+  pub fn stdout<T: Into<Stdio>>(mut self, cfg: T) -> Self {
+    self.stdout = Some(StdioContainer::new(cfg.into()));
+    self
+  }
+
+  pub fn stderr<T: Into<Stdio>>(mut self, cfg: T) -> Self {
+    self.stderr = Some(StdioContainer::new(cfg.into()));
+    self
+  }
+
+  pub fn current_dir<P: AsRef<OsStr>>(mut self, dir: P) -> Self {
+    let dir = dir.as_ref().to_string_lossy().to_string();
+    self.cwd = Some(match self.cwd {
+      Some(current) => current.join(dir),
+      None => PathRef::new(dir),
+    });
+    self
+  }
+
+  pub fn stdin_piped(self) -> Self {
+    self.stdin(std::process::Stdio::piped())
+  }
+
+  pub fn stdout_piped(self) -> Self {
+    self.stdout(std::process::Stdio::piped())
+  }
+
+  pub fn stderr_piped(self) -> Self {
+    self.stderr(std::process::Stdio::piped())
+  }
+
+  pub fn piped_output(self) -> Self {
+    self.stdout_piped().stderr_piped()
+  }
+
+  pub fn stdin_text(mut self, text: impl AsRef<str>) -> Self {
+    self.stdin_text = Some(text.as_ref().to_string());
+    self.stdin_piped()
+  }
+
+  /// Splits the output into stdout and stderr rather than having them combined.
+  pub fn split_output(mut self) -> Self {
+    // Note: it was previously attempted to capture stdout & stderr separately
+    // then forward the output to a combined pipe, but this was found to be
+    // too racy compared to providing the same combined pipe to both.
+    self.split_output = true;
+    self
+  }
+
+  pub fn with_pty(&self, mut action: impl FnMut(Pty)) {
+    if !Pty::is_supported() {
+      return;
+    }
+
+    let args = self.build_args();
+    let args = args.iter().map(|s| s.as_str()).collect::<Vec<_>>();
+    let mut envs = self.build_envs();
+    if !envs.contains_key("NO_COLOR") {
+      // set this by default for pty tests
+      envs.insert("NO_COLOR".to_string(), "1".to_string());
+    }
+
+    // note(dsherret): for some reason I need to inject the current
+    // environment here for the pty tests or else I get dns errors
+    if !self.env_clear {
+      for (key, value) in std::env::vars() {
+        envs.entry(key).or_insert(value);
+      }
+    }
+
+    let cwd = self
+      .cwd
+      .as_ref()
+      .map(PathBuf::from)
+      .unwrap_or_else(|| std::env::current_dir().unwrap());
+    let command_path = self.build_command_path();
+
+    println!("command {} {}", command_path, args.join(" "));
+    println!("command cwd {}", cwd.display());
+    action(Pty::new(command_path.as_path(), &args, &cwd, Some(envs)))
+  }
+
+  pub fn output(&self) -> Result<std::process::Output, std::io::Error> {
+    assert!(self.stdin_text.is_none(), "use spawn instead");
+    self.build_command().output()
+  }
+
+  pub fn status(&self) -> Result<std::process::ExitStatus, std::io::Error> {
+    assert!(self.stdin_text.is_none(), "use spawn instead");
+    self.build_command().status()
+  }
+
+  pub fn spawn(&self) -> Result<DenoChild, std::io::Error> {
+    let child = self.build_command().spawn()?;
+    let mut child = DenoChild {
+      _deno_dir: self.deno_dir.clone(),
+      child,
+    };
+
+    if let Some(input) = &self.stdin_text {
+      let mut p_stdin = child.stdin.take().unwrap();
+      write!(p_stdin, "{input}").unwrap();
+    }
+
+    Ok(child)
+  }
+
+  pub fn spawn_with_piped_output(&self) -> DenoChild {
+    self.clone().piped_output().spawn().unwrap()
+  }
+
+  pub fn run(&self) -> TestCommandOutput {
+    fn read_pipe_to_string(mut pipe: os_pipe::PipeReader) -> String {
+      let mut output = String::new();
+      pipe.read_to_string(&mut output).unwrap();
+      output
+    }
+
+    fn sanitize_output(
+      mut text: String,
+      args: &[OsString],
+      skip_strip_ansi: bool,
+    ) -> String {
+      if !skip_strip_ansi {
+        text = strip_ansi_codes(&text).to_string();
+      }
+      // deno test's output capturing flushes with a zero-width space in order to
+      // synchronize the output pipes. Occasionally this zero width space
+      // might end up in the output so strip it from the output comparison here.
+      if args.first().and_then(|s| s.to_str()) == Some("test") {
+        text = text.replace('\u{200B}', "");
+      }
+      text
+    }
+
+    let mut command = self.build_command();
+    let args = command
+      .get_args()
+      .map(ToOwned::to_owned)
+      .collect::<Vec<_>>();
+    let (combined_reader, std_out_err_handle) = if self.split_output {
+      let (stdout_reader, stdout_writer) = pipe().unwrap();
+      let (stderr_reader, stderr_writer) = pipe().unwrap();
+      command.stdout(stdout_writer);
+      command.stderr(stderr_writer);
+      (
+        None,
+        Some((
+          std::thread::spawn(move || read_pipe_to_string(stdout_reader)),
+          std::thread::spawn(move || read_pipe_to_string(stderr_reader)),
+        )),
+      )
+    } else {
+      let (combined_reader, combined_writer) = pipe().unwrap();
+      command.stdout(combined_writer.try_clone().unwrap());
+      command.stderr(combined_writer);
+      (Some(combined_reader), None)
+    };
+
+    let mut process = command.spawn().expect("Failed spawning command");
+
+    if let Some(input) = &self.stdin_text {
+      let mut p_stdin = process.stdin.take().unwrap();
+      write!(p_stdin, "{input}").unwrap();
+    }
+
+    // This parent process is still holding its copies of the write ends,
+    // and we have to close them before we read, otherwise the read end
+    // will never report EOF. The Command object owns the writers now,
+    // and dropping it closes them.
+    drop(command);
+
+    let combined = combined_reader.map(|pipe| {
+      sanitize_output(read_pipe_to_string(pipe), &args, self.skip_strip_ansi)
+    });
+
+    let status = process.wait().unwrap();
+    let std_out_err = std_out_err_handle.map(|(stdout, stderr)| {
+      (
+        sanitize_output(stdout.join().unwrap(), &args, self.skip_strip_ansi),
+        sanitize_output(stderr.join().unwrap(), &args, self.skip_strip_ansi),
+      )
+    });
+    let exit_code = status.code();
+    #[cfg(unix)]
+    let signal = {
+      use std::os::unix::process::ExitStatusExt;
+      status.signal()
+    };
+    #[cfg(not(unix))]
+    let signal = None;
+
+    TestCommandOutput {
+      exit_code,
+      signal,
+      combined,
+      std_out_err,
+      asserted_exit_code: RefCell::new(false),
+      asserted_stdout: RefCell::new(false),
+      asserted_stderr: RefCell::new(false),
+      asserted_combined: RefCell::new(false),
+      _deno_dir: self.deno_dir.clone(),
+    }
+  }
+
+  fn build_command(&self) -> Command {
+    let command_path = self.build_command_path();
+    let args = self.build_args();
+    println!("command {} {}", command_path, args.join(" "));
+    let mut command = Command::new(command_path);
+    if let Some(cwd) = &self.cwd {
+      println!("command cwd {}", cwd);
+      command.current_dir(cwd);
+    }
+    if let Some(stdin) = &self.stdin {
+      command.stdin(stdin.take());
+    }
+    if let Some(stdout) = &self.stdout {
+      command.stdout(stdout.take());
+    }
+    if let Some(stderr) = &self.stderr {
+      command.stderr(stderr.take());
+    }
+
+    command.args(args.iter());
+    if self.env_clear {
+      command.env_clear();
+    }
+    let envs = self.build_envs();
+    command.envs(envs);
+    command.stdin(Stdio::piped());
+    command
+  }
+
+  fn build_command_path(&self) -> PathRef {
+    let command_name = if cfg!(windows) && self.command_name == "npm" {
+      "npm.cmd"
+    } else {
+      &self.command_name
+    };
+    if command_name == "deno" {
+      deno_exe_path()
+    } else {
+      PathRef::new(PathBuf::from(command_name))
+    }
+  }
+
+  fn build_args(&self) -> Vec<String> {
+    if self.args_vec.is_empty() {
+      std::borrow::Cow::Owned(
+        self
+          .args_text
+          .split_whitespace()
+          .map(|s| s.to_string())
+          .collect::<Vec<_>>(),
+      )
+    } else {
+      assert!(
+        self.args_text.is_empty(),
+        "Do not provide args when providing args_vec."
+      );
+      std::borrow::Cow::Borrowed(&self.args_vec)
+    }
+    .iter()
+    .map(|arg| arg.replace("$TESTDATA", &testdata_path().to_string_lossy()))
+    .collect::<Vec<_>>()
+  }
+
+  fn build_envs(&self) -> HashMap<String, String> {
+    let mut envs = self.envs.clone();
+    if !envs.contains_key("DENO_DIR") {
+      envs.insert("DENO_DIR".to_string(), self.deno_dir.path().to_string());
+    }
+    if !envs.contains_key("NPM_CONFIG_REGISTRY") {
+      envs.insert("NPM_CONFIG_REGISTRY".to_string(), npm_registry_unset_url());
+    }
+    if !envs.contains_key("DENO_NO_UPDATE_CHECK") {
+      envs.insert("DENO_NO_UPDATE_CHECK".to_string(), "1".to_string());
+    }
+    if !envs.contains_key("JSR_URL") {
+      envs.insert("JSR_URL".to_string(), jsr_registry_unset_url());
+    }
+    for key in &self.envs_remove {
+      envs.remove(key);
+    }
+    envs
+  }
+}
+
+pub struct DenoChild {
+  // keep alive for the duration of the use of this struct
+  _deno_dir: TempDir,
+  child: Child,
+}
+
+impl Deref for DenoChild {
+  type Target = Child;
+  fn deref(&self) -> &Child {
+    &self.child
+  }
+}
+
+impl DerefMut for DenoChild {
+  fn deref_mut(&mut self) -> &mut Child {
+    &mut self.child
+  }
+}
+
+impl DenoChild {
+  pub fn wait_with_output(
+    self,
+  ) -> Result<std::process::Output, std::io::Error> {
+    self.child.wait_with_output()
+  }
+}
+
+pub struct TestCommandOutput {
+  combined: Option<String>,
+  std_out_err: Option<(String, String)>,
+  exit_code: Option<i32>,
+  signal: Option<i32>,
+  asserted_stdout: RefCell<bool>,
+  asserted_stderr: RefCell<bool>,
+  asserted_combined: RefCell<bool>,
+  asserted_exit_code: RefCell<bool>,
+  // keep alive for the duration of the output reference
+  _deno_dir: TempDir,
+}
+
+impl Drop for TestCommandOutput {
+  // assert the output and exit code was asserted
+  fn drop(&mut self) {
+    fn panic_unasserted_output(text: &str) {
+      println!("OUTPUT\n{text}\nOUTPUT");
+      panic!(concat!(
+        "The non-empty text of the command was not asserted. ",
+        "Call `output.skip_output_check()` to skip if necessary.",
+      ),);
+    }
+
+    if std::thread::panicking() {
+      return;
+    }
+
+    // either the combined output needs to be asserted or both stdout and stderr
+    if let Some(combined) = &self.combined {
+      if !*self.asserted_combined.borrow() && !combined.is_empty() {
+        panic_unasserted_output(combined);
+      }
+    }
+    if let Some((stdout, stderr)) = &self.std_out_err {
+      if !*self.asserted_stdout.borrow() && !stdout.is_empty() {
+        panic_unasserted_output(stdout);
+      }
+      if !*self.asserted_stderr.borrow() && !stderr.is_empty() {
+        panic_unasserted_output(stderr);
+      }
+    }
+
+    // now ensure the exit code was asserted
+    if !*self.asserted_exit_code.borrow() && self.exit_code != Some(0) {
+      self.print_output();
+      panic!(
+        "The non-zero exit code of the command was not asserted: {:?}",
+        self.exit_code,
+      )
+    }
+  }
+}
+
+impl TestCommandOutput {
+  pub fn skip_output_check(&self) -> &Self {
+    *self.asserted_combined.borrow_mut() = true;
+    self.skip_stdout_check();
+    self.skip_stderr_check();
+    self
+  }
+
+  pub fn skip_stdout_check(&self) -> &Self {
+    *self.asserted_stdout.borrow_mut() = true;
+    self
+  }
+
+  pub fn skip_stderr_check(&self) -> &Self {
+    *self.asserted_stderr.borrow_mut() = true;
+    self
+  }
+
+  pub fn skip_exit_code_check(&self) -> &Self {
+    *self.asserted_exit_code.borrow_mut() = true;
+    self
+  }
+
+  pub fn exit_code(&self) -> Option<i32> {
+    self.skip_exit_code_check();
+    self.exit_code
+  }
+
+  pub fn signal(&self) -> Option<i32> {
+    self.signal
+  }
+
+  pub fn combined_output(&self) -> &str {
+    self.skip_output_check();
+    self
+      .combined
+      .as_deref()
+      .expect("not available since .split_output() was called")
+  }
+
+  pub fn stdout(&self) -> &str {
+    *self.asserted_stdout.borrow_mut() = true;
+    self
+      .std_out_err
+      .as_ref()
+      .map(|(stdout, _)| stdout.as_str())
+      .expect("call .split_output() on the builder")
+  }
+
+  pub fn stderr(&self) -> &str {
+    *self.asserted_stderr.borrow_mut() = true;
+    self
+      .std_out_err
+      .as_ref()
+      .map(|(_, stderr)| stderr.as_str())
+      .expect("call .split_output() on the builder")
+  }
+
+  #[track_caller]
+  pub fn assert_exit_code(&self, expected_exit_code: i32) -> &Self {
+    let actual_exit_code = self.exit_code();
+
+    if let Some(exit_code) = &actual_exit_code {
+      if *exit_code != expected_exit_code {
+        self.print_output();
+        panic!(
+          "bad exit code, expected: {:?}, actual: {:?}",
+          expected_exit_code, exit_code,
+        );
+      }
+    } else {
+      self.print_output();
+      if let Some(signal) = self.signal() {
+        panic!(
+          "process terminated by signal, expected exit code: {:?}, actual signal: {:?}",
+          actual_exit_code,
+          signal,
+        );
+      } else {
+        panic!(
+          "process terminated without status code on non unix platform, expected exit code: {:?}",
+          actual_exit_code,
+        );
+      }
+    }
+
+    self
+  }
+
+  pub fn print_output(&self) {
+    if let Some(combined) = &self.combined {
+      println!("OUTPUT\n{combined}\nOUTPUT");
+    } else if let Some((stdout, stderr)) = &self.std_out_err {
+      println!("STDOUT OUTPUT\n{stdout}\nSTDOUT OUTPUT");
+      println!("STDERR OUTPUT\n{stderr}\nSTDERR OUTPUT");
+    }
+  }
+
+  #[track_caller]
+  pub fn assert_matches_text(&self, expected_text: impl AsRef<str>) -> &Self {
+    self.inner_assert_matches_text(self.combined_output(), expected_text)
+  }
+
+  #[track_caller]
+  pub fn assert_matches_file(&self, file_path: impl AsRef<Path>) -> &Self {
+    self.inner_assert_matches_file(self.combined_output(), file_path)
+  }
+
+  #[track_caller]
+  pub fn assert_stdout_matches_text(
+    &self,
+    expected_text: impl AsRef<str>,
+  ) -> &Self {
+    self.inner_assert_matches_text(self.stdout(), expected_text)
+  }
+
+  #[track_caller]
+  pub fn assert_stdout_matches_file(
+    &self,
+    file_path: impl AsRef<Path>,
+  ) -> &Self {
+    self.inner_assert_matches_file(self.stdout(), file_path)
+  }
+
+  #[track_caller]
+  pub fn assert_stderr_matches_text(
+    &self,
+    expected_text: impl AsRef<str>,
+  ) -> &Self {
+    self.inner_assert_matches_text(self.stderr(), expected_text)
+  }
+
+  #[track_caller]
+  pub fn assert_stderr_matches_file(
+    &self,
+    file_path: impl AsRef<Path>,
+  ) -> &Self {
+    self.inner_assert_matches_file(self.stderr(), file_path)
+  }
+
+  #[track_caller]
+  fn inner_assert_matches_text(
+    &self,
+    actual: &str,
+    expected: impl AsRef<str>,
+  ) -> &Self {
+    assert_wildcard_match(actual, expected.as_ref());
+    self
+  }
+
+  #[track_caller]
+  fn inner_assert_matches_file(
+    &self,
+    actual: &str,
+    file_path: impl AsRef<Path>,
+  ) -> &Self {
+    let output_path = testdata_path().join(file_path);
+    println!("output path {}", output_path);
+    let expected_text = output_path.read_to_string();
+    self.inner_assert_matches_text(actual, expected_text)
+  }
+}