diff --git a/implementors/node/run-tests.ts b/implementors/node/run-tests.ts
index 3f6fb88..ce83184 100644
--- a/implementors/node/run-tests.ts
+++ b/implementors/node/run-tests.ts
@@ -1,8 +1,8 @@
-import { spawn } from "node:child_process";
-import { promises as fs } from "node:fs";
 import path from "node:path";
 import { test, type TestContext } from "node:test";
 
+import { listDirectoryEntries, runFileInSubprocess } from "./tests.ts";
+
 const ROOT_PATH = path.resolve(import.meta.dirname, "..", "..");
 const TESTS_ROOT_PATH = path.join(ROOT_PATH, "tests");
 
@@ -19,79 +19,11 @@ const LOAD_ADDON_MODULE_PATH = path.join(
   "load-addon.js"
 );
 
-async function listDirectoryEntries(dir: string) {
-  const entries = await fs.readdir(dir, { withFileTypes: true });
-  const directories: string[] = [];
-  const files: string[] = [];
-
-  for (const entry of entries) {
-    if (entry.isDirectory()) {
-      directories.push(entry.name);
-    } else if (entry.isFile() && entry.name.endsWith(".js")) {
-      files.push(entry.name);
-    }
-  }
-
-  directories.sort();
-  files.sort();
-
-  return { directories, files };
-}
-
-function runFileInSubprocess(cwd: string, filePath: string): Promise<void> {
-  return new Promise((resolve, reject) => {
-    const child = spawn(
-      process.execPath,
-      [
-        // Using file scheme prefix when to enable imports on Windows
-        "--import",
-        "file://" + ASSERT_MODULE_PATH,
-        "--import",
-        "file://" + LOAD_ADDON_MODULE_PATH,
-        filePath,
-      ],
-      { cwd }
-    );
-
-    let stderrOutput = "";
-    child.stderr.setEncoding("utf8");
-    child.stderr.on("data", (chunk) => {
-      stderrOutput += chunk;
-    });
-
-    child.stdout.pipe(process.stdout);
-
-    child.on("error", reject);
-
-    child.on("close", (code, signal) => {
-      if (code === 0) {
-        resolve();
-        return;
-      }
-
-      const reason =
-        code !== null ? `exit code ${code}` : `signal ${signal ?? "unknown"}`;
-      const trimmedStderr = stderrOutput.trim();
-      const stderrSuffix = trimmedStderr
-        ? `\n--- stderr ---\n${trimmedStderr}\n--- end stderr ---`
-        : "";
-      reject(
-        new Error(
-          `Test file ${path.relative(
-            TESTS_ROOT_PATH,
-            filePath
-          )} failed (${reason})${stderrSuffix}`
-        )
-      );
-    });
-  });
-}
-
 async function populateSuite(
   testContext: TestContext,
   dir: string
 ): Promise<void> {
-  const { directories, files } = await listDirectoryEntries(dir);
+  const { directories, files } = listDirectoryEntries(dir);
 
   for (const file of files) {
     await testContext.test(file, () => runFileInSubprocess(dir, file));
diff --git a/implementors/node/tests.ts b/implementors/node/tests.ts
new file mode 100644
index 0000000..28dfa54
--- /dev/null
+++ b/implementors/node/tests.ts
@@ -0,0 +1,95 @@
+import assert from "node:assert";
+import { spawn } from "node:child_process";
+import fs from "node:fs";
+import path from "node:path";
+
+assert(
+  typeof import.meta.dirname === "string",
+  "Expecting a recent Node.js runtime API version"
+);
+
+const ROOT_PATH = path.resolve(import.meta.dirname, "..", "..");
+const TESTS_ROOT_PATH = path.join(ROOT_PATH, "tests");
+const ASSERT_MODULE_PATH = path.join(
+  ROOT_PATH,
+  "implementors",
+  "node",
+  "assert.js"
+);
+const LOAD_ADDON_MODULE_PATH = path.join(
+  ROOT_PATH,
+  "implementors",
+  "node",
+  "load-addon.js"
+);
+
+export function listDirectoryEntries(dir: string) {
+  const entries = fs.readdirSync(dir, { withFileTypes: true });
+  const directories: string[] = [];
+  const files: string[] = [];
+
+  for (const entry of entries) {
+    if (entry.isDirectory()) {
+      directories.push(entry.name);
+    } else if (entry.isFile() && entry.name.endsWith(".js")) {
+      files.push(entry.name);
+    }
+  }
+
+  directories.sort();
+  files.sort();
+
+  return { directories, files };
+}
+
+export function runFileInSubprocess(
+  cwd: string,
+  filePath: string
+): Promise<void> {
+  return new Promise((resolve, reject) => {
+    const child = spawn(
+      process.execPath,
+      [
+        // Using file scheme prefix when to enable imports on Windows
+        "--import",
+        "file://" + ASSERT_MODULE_PATH,
+        "--import",
+        "file://" + LOAD_ADDON_MODULE_PATH,
+        filePath,
+      ],
+      { cwd }
+    );
+
+    let stderrOutput = "";
+    child.stderr.setEncoding("utf8");
+    child.stderr.on("data", (chunk) => {
+      stderrOutput += chunk;
+    });
+
+    child.stdout.pipe(process.stdout);
+
+    child.on("error", reject);
+
+    child.on("close", (code, signal) => {
+      if (code === 0) {
+        resolve();
+        return;
+      }
+
+      const reason =
+        code !== null ? `exit code ${code}` : `signal ${signal ?? "unknown"}`;
+      const trimmedStderr = stderrOutput.trim();
+      const stderrSuffix = trimmedStderr
+        ? `\n--- stderr ---\n${trimmedStderr}\n--- end stderr ---`
+        : "";
+      reject(
+        new Error(
+          `Test file ${path.relative(
+            TESTS_ROOT_PATH,
+            filePath
+          )} failed (${reason})${stderrSuffix}`
+        )
+      );
+    });
+  });
+}