1 files changed, 66 insertions, 0 deletions
diff --git a/tests/unit_node/vm_test.ts b/tests/unit_node/vm_test.ts
new file mode 100644
index 000000000..30449a7b1
--- /dev/null
+++ b/tests/unit_node/vm_test.ts
@@ -0,0 +1,66 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+import { isContext, runInNewContext } from "node:vm";
+import { assertEquals, assertThrows } from "@test_util/std/assert/mod.ts";
+
+Deno.test({
+  name: "vm runInNewContext",
+  fn() {
+    const two = runInNewContext("1 + 1");
+    assertEquals(two, 2);
+  },
+});
+
+Deno.test({
+  name: "vm runInNewContext sandbox",
+  fn() {
+    assertThrows(() => runInNewContext("Deno"));
+    // deno-lint-ignore no-var
+    var a = 1;
+    assertThrows(() => runInNewContext("a + 1"));
+
+    runInNewContext("a = 2");
+    assertEquals(a, 1);
+  },
+});
+
+// https://github.com/webpack/webpack/blob/87660921808566ef3b8796f8df61bd79fc026108/lib/javascript/JavascriptParser.js#L4329
+Deno.test({
+  name: "vm runInNewContext webpack magic comments",
+  fn() {
+    const webpackCommentRegExp = new RegExp(
+      /(^|\W)webpack[A-Z]{1,}[A-Za-z]{1,}:/,
+    );
+    const comments = [
+      'webpackChunkName: "test"',
+      'webpackMode: "lazy"',
+      "webpackPrefetch: true",
+      "webpackPreload: true",
+      "webpackProvidedExports: true",
+      'webpackChunkLoading: "require"',
+      'webpackExports: ["default", "named"]',
+    ];
+
+    for (const comment of comments) {
+      const result = webpackCommentRegExp.test(comment);
+      assertEquals(result, true);
+
+      const [[key, _value]]: [string, string][] = Object.entries(
+        runInNewContext(`(function(){return {${comment}};})()`),
+      );
+      const expectedKey = comment.split(":")[0].trim();
+      assertEquals(key, expectedKey);
+    }
+  },
+});
+
+Deno.test({
+  name: "vm isContext",
+  fn() {
+    // Currently we do not expose VM contexts so this is always false.
+    const obj = {};
+    assertEquals(isContext(obj), false);
+    assertEquals(isContext(globalThis), false);
+    const sandbox = runInNewContext("{}");
+    assertEquals(isContext(sandbox), false);
+  },
+});