add tests that uses nodejs sidecar

build/wd_test.bzl

@@ -65,30 +65,75 @@ def _wd_test_impl(ctx):
     if is_windows:
         # Batch script executables must end with ".bat"
         executable = ctx.actions.declare_file("%s_wd_test.bat" % ctx.label.name)
-        ctx.actions.write(
-            output = executable,
-            # PowerShell correctly handles forward slashes in executable paths generated by Bazel (e.g. "bazel-bin/src/workerd/server/workerd.exe")
-            content = "powershell -Command \"%*\" `-dTEST_TMPDIR=$ENV:TEST_TMPDIR\r\n",
-            is_executable = True,
-        )
+        content = """
+@echo off
+setlocal EnableDelayedExpansion
+
+REM Start sidecar if specified
+if not "$(SIDECAR)" == "" (
+    start /b "" "$(SIDECAR)" > nul 2>&1
+    set SIDECAR_PID=!ERRORLEVEL!
+    timeout /t 1 > nul
+)
+
+REM Run the actual test
+powershell -Command "%*" `-dTEST_TMPDIR=$ENV:TEST_TMPDIR
+set TEST_EXIT=!ERRORLEVEL!
+
+REM Cleanup sidecar if it was started
+if defined SIDECAR_PID (
+    taskkill /F /PID !SIDECAR_PID! > nul 2>&1
+)
+
+exit /b !TEST_EXIT!
+""".replace("$(SIDECAR)", ctx.file.sidecar.path if ctx.file.sidecar else "")
     else:
         executable = ctx.outputs.executable
-        ctx.actions.write(
-            output = executable,
-            content = """
-                #! /bin/sh
-                echo
-                echo \\(cd `pwd` \\&\\& \"$@\" -dTEST_TMPDIR=$TEST_TMPDIR\\)
-                echo
-                exec \"$@\" -dTEST_TMPDIR=$TEST_TMPDIR
-                """,
-            is_executable = True,
-        )
+        content = """#!/bin/sh
+set -e
+
+cleanup() {
+    if [ ! -z "$SIDECAR_PID" ]; then
+        kill $SIDECAR_PID 2>/dev/null || true
+        wait $SIDECAR_PID 2>/dev/null || true
+        if [ -f sidecar.log ]; then
+            cat sidecar.log
+        fi
+    fi
+}
+
+trap cleanup EXIT
+
+# Start sidecar if specified
+if [ ! -z "$(SIDECAR)" ]; then
+    "$(SIDECAR)" > sidecar.log 2>&1 &
+    SIDECAR_PID=$!
+    sleep 3
+fi
+
+# Run the actual test
+"$@" -dTEST_TMPDIR=$TEST_TMPDIR
+""".replace("$(SIDECAR)", ctx.file.sidecar.short_path if ctx.file.sidecar else "")
+
+    ctx.actions.write(
+        output = executable,
+        content = content,
+        is_executable = True,
+    )
+
+    runfiles = ctx.runfiles(files = ctx.files.data)
+    if ctx.file.sidecar:
+        runfiles = runfiles.merge(ctx.runfiles(files = [ctx.file.sidecar]))
+
+        # Also merge the sidecar's own runfiles if it has any
+        default_runfiles = ctx.attr.sidecar[DefaultInfo].default_runfiles
+        if default_runfiles:
+            runfiles = runfiles.merge(default_runfiles)
 
     return [
         DefaultInfo(
             executable = executable,
-            runfiles = ctx.runfiles(files = ctx.files.data),
+            runfiles = runfiles,
         ),
     ]
 
@@ -104,6 +149,11 @@ _wd_test = rule(
         ),
         "flags": attr.string_list(),
         "data": attr.label_list(allow_files = True),
+        "sidecar": attr.label(
+            allow_single_file = True,
+            executable = True,
+            cfg = "exec",
+        ),
         "_platforms_os_windows": attr.label(default = "@platforms//os:windows"),
     },
 )

src/workerd/api/node/BUILD.bazel

@@ -1,3 +1,4 @@
+load("@aspect_rules_js//js:defs.bzl", "js_binary")
 load("@bazel_skylib//lib:selects.bzl", "selects")
 load("//:build/kj_test.bzl", "kj_test")
 load("//:build/wd_cc_library.bzl", "wd_cc_library")
@@ -253,3 +254,16 @@ wd_test(
     args = ["--experimental"],
     data = ["tests/dns-nodejs-test.js"],
 )
+
+js_binary(
+    name = "net-nodejs-tcp-server",
+    entry_point = "tests/net-nodejs-tcp-server.js",
+)
+
+wd_test(
+    size = "large",
+    src = "tests/net-nodejs-test.wd-test",
+    args = ["--experimental"],
+    data = ["tests/net-nodejs-test.js"],
+    sidecar = "net-nodejs-tcp-server",
+)

src/workerd/api/node/tests/net-nodejs-tcp-server.js

@@ -0,0 +1,26 @@
+// Copyright (c) 2017-2022 Cloudflare, Inc.
+// Licensed under the Apache 2.0 license found in the LICENSE file or at:
+//     https://opensource.org/licenses/Apache-2.0
+
+// This file is used as a sidecar for the net-nodejs-test tests.
+// It creates 2 TCP servers to act as a source of truth for the node:net tests.
+// We execute this command using Node.js, which makes net.createServer available.
+const net = require('node:net');
+
+const server = net.createServer((s) => {
+  s.on('error', (err) => {
+    // Required for process to not crash.
+    console.error(err);
+  });
+  s.end();
+});
+server.listen(9999, () => console.info('Listening on port 9999'));
+
+const echoServer = net.createServer((s) => {
+  s.on('error', (err) => {
+    // Required for process to not crash.
+    console.error(err);
+  });
+  s.pipe(s);
+});
+echoServer.listen(9998, () => console.info('Listening on port 9998'));